.NET Framework Class Library
CollectionT Class

Provides the base class for a generic collection.

Inheritance Hierarchy
SystemObject
  System.Collections.ObjectModelCollectionT
    More...

Namespace:   System.Collections.ObjectModel
Assembly:  mscorlib (in mscorlib.dll)
Syntax
<[%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_0%]> _
<[%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_1%](False)> _
Public Class Collection(Of T) _
	Implements [%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_2%](Of T), [%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_3%](Of T),  _
	[%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_4%], [%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_5%], [%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_6%](Of T), [%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_7%](Of T),  _
	[%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_8%](Of T), [%$TOPIC/ms132397_en-us_VS_110_2_0_0_0_9%]
[[%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_0%]]
[[%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_1%](false)]
public class Collection<T> : [%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_2%]<T>, 
	[%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_3%]<T>, [%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_4%], [%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_5%], [%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_6%]<T>, [%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_7%]<T>, 
	[%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_8%]<T>, [%$TOPIC/ms132397_en-us_VS_110_2_0_1_0_9%]
[[%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_0%]]
[[%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_1%](false)]
generic<typename T>
public ref class Collection : [%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_2%]<T>, 
	[%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_3%]<T>, [%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_4%], [%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_5%], [%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_6%]<T>, [%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_7%]<T>, 
	[%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_8%]<T>, [%$TOPIC/ms132397_en-us_VS_110_2_0_2_0_9%]
[<[%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_0%]>]
[<[%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_1%](false)>]
type Collection<'T> =  
    class 
        interface [%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_2%]<'T>
        interface [%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_3%]<'T>
        interface [%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_4%] 
        interface [%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_5%] 
        interface [%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_6%]<'T>
        interface [%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_7%]<'T>
        interface [%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_8%]<'T>
        interface [%$TOPIC/ms132397_en-us_VS_110_2_0_3_0_9%] 
    end

Type Parameters

T

The type of elements in the collection.

The CollectionT type exposes the following members.

Constructors
  NameDescription
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps CollectionTInitializes a new instance of the CollectionT class that is empty.
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps CollectionT(IListT)Initializes a new instance of the CollectionT class as a wrapper for the specified list.
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Properties
  NameDescription
Public property Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps CountGets the number of elements actually contained in the CollectionT.
Public property Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ItemGets or sets the element at the specified index.
Protected property Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ItemsGets a IListT wrapper around the CollectionT.
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Methods
  NameDescription
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AddAdds an object to the end of the CollectionT.
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ClearRemoves all elements from the CollectionT.
Protected method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ClearItemsRemoves all elements from the CollectionT.
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ContainsDetermines whether an element is in the CollectionT.
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps CopyToCopies the entire CollectionT to a compatible one-dimensional Array, starting at the specified index of the target array.
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps Equals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps FinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GetEnumeratorReturns an enumerator that iterates through the CollectionT.
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GetHashCodeServes as the default hash function. (Inherited from Object.)
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GetTypeGets the Type of the current instance. (Inherited from Object.)
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IndexOfSearches for the specified object and returns the zero-based index of the first occurrence within the entire CollectionT.
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps InsertInserts an element into the CollectionT at the specified index.
Protected method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps InsertItemInserts an element into the CollectionT at the specified index.
Protected method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps RemoveRemoves the first occurrence of a specific object from the CollectionT.
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps RemoveAtRemoves the element at the specified index of the CollectionT.
Protected method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps RemoveItemRemoves the element at the specified index of the CollectionT.
Protected method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SetItemReplaces the element at the specified index.
Public method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToStringReturns a string that represents the current object. (Inherited from Object.)
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Extension Methods
  NameDescription
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AggregateT(FuncT, T, T)Overloaded. Applies an accumulator function over a sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AggregateT, TAccumulate(TAccumulate, FuncTAccumulate, T, TAccumulate)Overloaded. Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AggregateT, TAccumulate, TResult(TAccumulate, FuncTAccumulate, T, TAccumulate, FuncTAccumulate, TResult)Overloaded. Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AllTDetermines whether all elements of a sequence satisfy a condition. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AnyTOverloaded. Determines whether a sequence contains any elements. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AnyT(FuncT, Boolean)Overloaded. Determines whether any element of a sequence satisfies a condition. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AsEnumerableTReturns the input typed as IEnumerableT. (Defined by Enumerable.)
Public Extension Method Supported by Portable Class Library Supported in .NET for Windows Store apps AsParallelOverloaded. Enables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension Method Supported by Portable Class Library Supported in .NET for Windows Store apps AsParallelTOverloaded. Enables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension Method Supported by Portable Class Library Supported in .NET for Windows Store apps AsQueryableOverloaded. Converts an IEnumerable to an IQueryable. (Defined by Queryable.)
Public Extension Method Supported by Portable Class Library Supported in .NET for Windows Store apps AsQueryableTOverloaded. Converts a generic IEnumerableT to a generic IQueryableT. (Defined by Queryable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, Decimal)Overloaded. Computes the average of a sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, NullableDecimal)Overloaded. Computes the average of a sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, Double)Overloaded. Computes the average of a sequence of Double values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, NullableDouble)Overloaded. Computes the average of a sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, Int32)Overloaded. Computes the average of a sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, NullableInt32)Overloaded. Computes the average of a sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, Int64)Overloaded. Computes the average of a sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, NullableInt64)Overloaded. Computes the average of a sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, Single)Overloaded. Computes the average of a sequence of Single values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps AverageT(FuncT, NullableSingle)Overloaded. Computes the average of a sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps CastTResultCasts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ConcatTConcatenates two sequences. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ContainsT(T)Overloaded. Determines whether a sequence contains a specified element by using the default equality comparer. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ContainsT(T, IEqualityComparerT)Overloaded. Determines whether a sequence contains a specified element by using a specified IEqualityComparerT. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps CountTOverloaded. Returns the number of elements in a sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps CountT(FuncT, Boolean)Overloaded. Returns a number that represents how many elements in the specified sequence satisfy a condition. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps DefaultIfEmptyTOverloaded. Returns the elements of the specified sequence or the type parameter's default value in a singleton collection if the sequence is empty. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps DefaultIfEmptyT(T)Overloaded. Returns the elements of the specified sequence or the specified value in a singleton collection if the sequence is empty. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps DistinctTOverloaded. Returns distinct elements from a sequence by using the default equality comparer to compare values. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps DistinctT(IEqualityComparerT)Overloaded. Returns distinct elements from a sequence by using a specified IEqualityComparerT to compare values. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ElementAtTReturns the element at a specified index in a sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ElementAtOrDefaultTReturns the element at a specified index in a sequence or a default value if the index is out of range. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ExceptT(IEnumerableT)Overloaded. Produces the set difference of two sequences by using the default equality comparer to compare values. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ExceptT(IEnumerableT, IEqualityComparerT)Overloaded. Produces the set difference of two sequences by using the specified IEqualityComparerT to compare values. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps FirstTOverloaded. Returns the first element of a sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps FirstT(FuncT, Boolean)Overloaded. Returns the first element in a sequence that satisfies a specified condition. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps FirstOrDefaultTOverloaded. Returns the first element of a sequence, or a default value if the sequence contains no elements. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps FirstOrDefaultT(FuncT, Boolean)Overloaded. Returns the first element of the sequence that satisfies a condition or a default value if no such element is found. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupByT, TKey(FuncT, TKey)Overloaded. Groups the elements of a sequence according to a specified key selector function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupByT, TKey(FuncT, TKey, IEqualityComparerTKey)Overloaded. Groups the elements of a sequence according to a specified key selector function and compares the keys by using a specified comparer. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupByT, TKey, TElement(FuncT, TKey, FuncT, TElement)Overloaded. Groups the elements of a sequence according to a specified key selector function and projects the elements for each group by using a specified function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupByT, TKey, TResult(FuncT, TKey, FuncTKey, IEnumerableT, TResult)Overloaded. Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupByT, TKey, TElement(FuncT, TKey, FuncT, TElement, IEqualityComparerTKey)Overloaded. Groups the elements of a sequence according to a key selector function. The keys are compared by using a comparer and each group's elements are projected by using a specified function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupByT, TKey, TResult(FuncT, TKey, FuncTKey, IEnumerableT, TResult, IEqualityComparerTKey)Overloaded. Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The keys are compared by using a specified comparer. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupByT, TKey, TElement, TResult(FuncT, TKey, FuncT, TElement, FuncTKey, IEnumerableTElement, TResult)Overloaded. Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. The elements of each group are projected by using a specified function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupByT, TKey, TElement, TResult(FuncT, TKey, FuncT, TElement, FuncTKey, IEnumerableTElement, TResult, IEqualityComparerTKey)Overloaded. Groups the elements of a sequence according to a specified key selector function and creates a result value from each group and its key. Key values are compared by using a specified comparer, and the elements of each group are projected by using a specified function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupJoinT, TInner, TKey, TResult(IEnumerableTInner, FuncT, TKey, FuncTInner, TKey, FuncT, IEnumerableTInner, TResult)Overloaded. Correlates the elements of two sequences based on equality of keys and groups the results. The default equality comparer is used to compare keys. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps GroupJoinT, TInner, TKey, TResult(IEnumerableTInner, FuncT, TKey, FuncTInner, TKey, FuncT, IEnumerableTInner, TResult, IEqualityComparerTKey)Overloaded. Correlates the elements of two sequences based on key equality and groups the results. A specified IEqualityComparerT is used to compare keys. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IntersectT(IEnumerableT)Overloaded. Produces the set intersection of two sequences by using the default equality comparer to compare values. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IntersectT(IEnumerableT, IEqualityComparerT)Overloaded. Produces the set intersection of two sequences by using the specified IEqualityComparerT to compare values. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps JoinT, TInner, TKey, TResult(IEnumerableTInner, FuncT, TKey, FuncTInner, TKey, FuncT, TInner, TResult)Overloaded. Correlates the elements of two sequences based on matching keys. The default equality comparer is used to compare keys. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps JoinT, TInner, TKey, TResult(IEnumerableTInner, FuncT, TKey, FuncTInner, TKey, FuncT, TInner, TResult, IEqualityComparerTKey)Overloaded. Correlates the elements of two sequences based on matching keys. A specified IEqualityComparerT is used to compare keys. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps LastTOverloaded. Returns the last element of a sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps LastT(FuncT, Boolean)Overloaded. Returns the last element of a sequence that satisfies a specified condition. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps LastOrDefaultTOverloaded. Returns the last element of a sequence, or a default value if the sequence contains no elements. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps LastOrDefaultT(FuncT, Boolean)Overloaded. Returns the last element of a sequence that satisfies a condition or a default value if no such element is found. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps LongCountTOverloaded. Returns an Int64 that represents the total number of elements in a sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps LongCountT(FuncT, Boolean)Overloaded. Returns an Int64 that represents how many elements in a sequence satisfy a condition. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxTOverloaded. Returns the maximum value in a generic sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, Decimal)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Decimal value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, NullableDecimal)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Decimal value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, Double)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Double value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, NullableDouble)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Double value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, Int32)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Int32 value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, NullableInt32)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Int32 value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, Int64)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Int64 value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, NullableInt64)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Int64 value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, Single)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Single value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT(FuncT, NullableSingle)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Single value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MaxT, TResult(FuncT, TResult)Overloaded. Invokes a transform function on each element of a generic sequence and returns the maximum resulting value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinTOverloaded. Returns the minimum value in a generic sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, Decimal)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Decimal value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, NullableDecimal)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Decimal value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, Double)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Double value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, NullableDouble)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Double value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, Int32)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Int32 value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, NullableInt32)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Int32 value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, Int64)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Int64 value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, NullableInt64)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Int64 value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, Single)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Single value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT(FuncT, NullableSingle)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Single value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps MinT, TResult(FuncT, TResult)Overloaded. Invokes a transform function on each element of a generic sequence and returns the minimum resulting value. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps OfTypeTResultFilters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps OrderByT, TKey(FuncT, TKey)Overloaded. Sorts the elements of a sequence in ascending order according to a key. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps OrderByT, TKey(FuncT, TKey, IComparerTKey)Overloaded. Sorts the elements of a sequence in ascending order by using a specified comparer. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps OrderByDescendingT, TKey(FuncT, TKey)Overloaded. Sorts the elements of a sequence in descending order according to a key. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps OrderByDescendingT, TKey(FuncT, TKey, IComparerTKey)Overloaded. Sorts the elements of a sequence in descending order by using a specified comparer. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ReverseTInverts the order of the elements in a sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SelectT, TResult(FuncT, TResult)Overloaded. Projects each element of a sequence into a new form. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SelectT, TResult(FuncT, Int32, TResult)Overloaded. Projects each element of a sequence into a new form by incorporating the element's index. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SelectManyT, TResult(FuncT, IEnumerableTResult)Overloaded. Projects each element of a sequence to an IEnumerableT and flattens the resulting sequences into one sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SelectManyT, TResult(FuncT, Int32, IEnumerableTResult)Overloaded. Projects each element of a sequence to an IEnumerableT, and flattens the resulting sequences into one sequence. The index of each source element is used in the projected form of that element. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SelectManyT, TCollection, TResult(FuncT, Int32, IEnumerableTCollection, FuncT, TCollection, TResult)Overloaded. Projects each element of a sequence to an IEnumerableT, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. The index of each source element is used in the intermediate projected form of that element. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SelectManyT, TCollection, TResult(FuncT, IEnumerableTCollection, FuncT, TCollection, TResult)Overloaded. Projects each element of a sequence to an IEnumerableT, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SequenceEqualT(IEnumerableT)Overloaded. Determines whether two sequences are equal by comparing the elements by using the default equality comparer for their type. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SequenceEqualT(IEnumerableT, IEqualityComparerT)Overloaded. Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparerT. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SingleTOverloaded. Returns the only element of a sequence, and throws an exception if there is not exactly one element in the sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SingleT(FuncT, Boolean)Overloaded. Returns the only element of a sequence that satisfies a specified condition, and throws an exception if more than one such element exists. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SingleOrDefaultTOverloaded. Returns the only element of a sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SingleOrDefaultT(FuncT, Boolean)Overloaded. Returns the only element of a sequence that satisfies a specified condition or a default value if no such element exists; this method throws an exception if more than one element satisfies the condition. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SkipTBypasses a specified number of elements in a sequence and then returns the remaining elements. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SkipWhileT(FuncT, Boolean)Overloaded. Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SkipWhileT(FuncT, Int32, Boolean)Overloaded. Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements. The element's index is used in the logic of the predicate function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, Decimal)Overloaded. Computes the sum of the sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, NullableDecimal)Overloaded. Computes the sum of the sequence of nullable Decimal values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, Double)Overloaded. Computes the sum of the sequence of Double values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, NullableDouble)Overloaded. Computes the sum of the sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, Int32)Overloaded. Computes the sum of the sequence of Int32 values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, NullableInt32)Overloaded. Computes the sum of the sequence of nullable Int32 values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, Int64)Overloaded. Computes the sum of the sequence of Int64 values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, NullableInt64)Overloaded. Computes the sum of the sequence of nullable Int64 values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, Single)Overloaded. Computes the sum of the sequence of Single values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps SumT(FuncT, NullableSingle)Overloaded. Computes the sum of the sequence of nullable Single values that are obtained by invoking a transform function on each element of the input sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps TakeTReturns a specified number of contiguous elements from the start of a sequence. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps TakeWhileT(FuncT, Boolean)Overloaded. Returns elements from a sequence as long as a specified condition is true. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps TakeWhileT(FuncT, Int32, Boolean)Overloaded. Returns elements from a sequence as long as a specified condition is true. The element's index is used in the logic of the predicate function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToArrayTCreates an array from a IEnumerableT. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToDictionaryT, TKey(FuncT, TKey)Overloaded. Creates a DictionaryTKey, TValue from an IEnumerableT according to a specified key selector function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToDictionaryT, TKey(FuncT, TKey, IEqualityComparerTKey)Overloaded. Creates a DictionaryTKey, TValue from an IEnumerableT according to a specified key selector function and key comparer. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToDictionaryT, TKey, TElement(FuncT, TKey, FuncT, TElement)Overloaded. Creates a DictionaryTKey, TValue from an IEnumerableT according to specified key selector and element selector functions. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToDictionaryT, TKey, TElement(FuncT, TKey, FuncT, TElement, IEqualityComparerTKey)Overloaded. Creates a DictionaryTKey, TValue from an IEnumerableT according to a specified key selector function, a comparer, and an element selector function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToListTCreates a ListT from an IEnumerableT. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToLookupT, TKey(FuncT, TKey)Overloaded. Creates a LookupTKey, TElement from an IEnumerableT according to a specified key selector function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToLookupT, TKey(FuncT, TKey, IEqualityComparerTKey)Overloaded. Creates a LookupTKey, TElement from an IEnumerableT according to a specified key selector function and key comparer. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToLookupT, TKey, TElement(FuncT, TKey, FuncT, TElement)Overloaded. Creates a LookupTKey, TElement from an IEnumerableT according to specified key selector and element selector functions. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ToLookupT, TKey, TElement(FuncT, TKey, FuncT, TElement, IEqualityComparerTKey)Overloaded. Creates a LookupTKey, TElement from an IEnumerableT according to a specified key selector function, a comparer and an element selector function. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps UnionT(IEnumerableT)Overloaded. Produces the set union of two sequences by using the default equality comparer. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps UnionT(IEnumerableT, IEqualityComparerT)Overloaded. Produces the set union of two sequences by using a specified IEqualityComparerT. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps WhereT(FuncT, Boolean)Overloaded. Filters a sequence of values based on a predicate. (Defined by Enumerable.)
Public Extension Method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps WhereT(FuncT, Int32, Boolean)Overloaded. Filters a sequence of values based on a predicate. Each element's index is used in the logic of the predicate function. (Defined by Enumerable.)
Public Extension Method Supported by Portable Class Library Supported in .NET for Windows Store apps ZipT, TSecond, TResultApplies a specified function to the corresponding elements of two sequences, producing a sequence of the results. (Defined by Enumerable.)
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Explicit Interface Implementations
  NameDescription
Explicit interface implemetation Private method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ICollectionCopyToCopies the elements of the ICollection to an Array, starting at a particular Array index.
Explicit interface implemetation Private property Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ICollectionTIsReadOnlyGets a value indicating whether the ICollectionT is read-only.
Explicit interface implemetation Private property Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ICollectionIsSynchronizedGets a value indicating whether access to the ICollection is synchronized (thread safe).
Explicit interface implemetation Private property Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps ICollectionSyncRootGets an object that can be used to synchronize access to the ICollection.
Explicit interface implemetation Private method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IEnumerableGetEnumeratorReturns an enumerator that iterates through a collection.
Explicit interface implemetation Private method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IListAddAdds an item to the IList.
Explicit interface implemetation Private method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IListContainsDetermines whether the IList contains a specific value.
Explicit interface implemetation Private method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IListIndexOfDetermines the index of a specific item in the IList.
Explicit interface implemetation Private method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IListInsertInserts an item into the IList at the specified index.
Explicit interface implemetation Private property Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IListIsFixedSizeGets a value indicating whether the IList has a fixed size.
Explicit interface implemetation Private property Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IListIsReadOnlyGets a value indicating whether the IList is read-only.
Explicit interface implemetation Private property Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IListItemGets or sets the element at the specified index.
Explicit interface implemetation Private method Supported by the XNA Framework Supported by Portable Class Library Supported in .NET for Windows Store apps IListRemoveRemoves the first occurrence of a specific object from the IList.
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Remarks

The CollectionT class can be used immediately by creating an instance of one of its constructed types; all you have to do is specify the type of object to be contained in the collection. In addition, you can derive your own collection type from any constructed type, or derive a generic collection type from the CollectionT class itself.

The CollectionT class provides protected methods that can be used to customize its behavior when adding and removing items, clearing the collection, or setting the value of an existing item.

Most CollectionT objects can be modified. However, a CollectionT object that is initialized with a read-only IListT object cannot be modified. See ReadOnlyCollectionT for a read-only version of this class.

Elements in this collection can be accessed using an integer index. Indexes in this collection are zero-based.

CollectionT accepts as a valid value for reference types and allows duplicate elements.

Notes to Implementers

This base class is provided to make it easier for implementers to create a custom collection. Implementers are encouraged to extend this base class instead of creating their own.

Examples

This section contains two code examples. The first example demonstrates several properties and methods of the CollectionT class. The second example shows how to derive a collection class from a constructed type of CollectionT, and how to override the protected methods of CollectionT to provide custom behavior.

Example 1

The following code example demonstrates many of the properties and methods of CollectionT. The code example creates a collection of strings, uses the Add method to add several strings, displays the Count, and lists the strings. The example uses the IndexOf method to find the index of a string and the Contains method to determine whether a string is in the collection. The example inserts a string using the Insert method and retrieves and sets strings using the default Item property (the indexer in C#). The example removes strings by string identity using the Remove method and by index using the RemoveAt method. Finally, the Clear method is used to clear all strings from the collection.

Imports System
Imports System.Collections.Generic
Imports System.Collections.ObjectModel

Public Class Demo

    Public Shared Sub Main() 

        Dim dinosaurs As New Collection(Of String)

        dinosaurs.Add("Psitticosaurus")
        dinosaurs.Add("Caudipteryx")
        dinosaurs.Add("Compsognathus")
        dinosaurs.Add("Muttaburrasaurus")

        Console.WriteLine("{0} dinosaurs:", dinosaurs.Count)
        Display(dinosaurs)

        Console.WriteLine(vbLf & "IndexOf(""Muttaburrasaurus""): {0}", _
            dinosaurs.IndexOf("Muttaburrasaurus"))

        Console.WriteLine(vbLf & "Contains(""Caudipteryx""): {0}", _
            dinosaurs.Contains("Caudipteryx"))

        Console.WriteLine(vbLf & "Insert(2, ""Nanotyrannus"")")
        dinosaurs.Insert(2, "Nanotyrannus")
        Display(dinosaurs)

        Console.WriteLine(vbLf & "dinosaurs(2): {0}", dinosaurs(2))

        Console.WriteLine(vbLf & "dinosaurs(2) = ""Microraptor""")
        dinosaurs(2) = "Microraptor"
        Display(dinosaurs)

        Console.WriteLine(vbLf & "Remove(""Microraptor"")")
        dinosaurs.Remove("Microraptor")
        Display(dinosaurs)

        Console.WriteLine(vbLf & "RemoveAt(0)")
        dinosaurs.RemoveAt(0)
        Display(dinosaurs)

        Console.WriteLine(vbLf & "dinosaurs.Clear()")
        dinosaurs.Clear()
        Console.WriteLine("Count: {0}", dinosaurs.Count)

    End Sub 

    Private Shared Sub Display(ByVal cs As Collection(Of String)) 
        Console.WriteLine()
        For Each item As String In cs
            Console.WriteLine(item)
        Next item
    End Sub 
End Class 

' This code example produces the following output: 
' 
'4 dinosaurs: 
' 
'Psitticosaurus 
'Caudipteryx 
'Compsognathus 
'Muttaburrasaurus 
' 
'IndexOf("Muttaburrasaurus"): 3 
' 
'Contains("Caudipteryx"): True 
' 
'Insert(2, "Nanotyrannus") 
' 
'Psitticosaurus 
'Caudipteryx 
'Nanotyrannus 
'Compsognathus 
'Muttaburrasaurus 
' 
'dinosaurs(2): Nanotyrannus 
' 
'dinosaurs(2) = "Microraptor" 
' 
'Psitticosaurus 
'Caudipteryx 
'Microraptor 
'Compsognathus 
'Muttaburrasaurus 
' 
'Remove("Microraptor") 
' 
'Psitticosaurus 
'Caudipteryx 
'Compsognathus 
'Muttaburrasaurus 
' 
'RemoveAt(0) 
' 
'Caudipteryx 
'Compsognathus 
'Muttaburrasaurus 
' 
'dinosaurs.Clear() 
'Count: 0
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

public class Demo
{
    public static void Main()
    {
        Collection<string> dinosaurs = new Collection<string>();

        dinosaurs.Add("Psitticosaurus");
        dinosaurs.Add("Caudipteryx");
        dinosaurs.Add("Compsognathus");
        dinosaurs.Add("Muttaburrasaurus");

        Console.WriteLine("{0} dinosaurs:", dinosaurs.Count);
        Display(dinosaurs);

        Console.WriteLine("\nIndexOf(\"Muttaburrasaurus\"): {0}", 
            dinosaurs.IndexOf("Muttaburrasaurus"));

        Console.WriteLine("\nContains(\"Caudipteryx\"): {0}", 
            dinosaurs.Contains("Caudipteryx"));

        Console.WriteLine("\nInsert(2, \"Nanotyrannus\")");
        dinosaurs.Insert(2, "Nanotyrannus");
        Display(dinosaurs);

        Console.WriteLine("\ndinosaurs[2]: {0}", dinosaurs[2]);

        Console.WriteLine("\ndinosaurs[2] = \"Microraptor\"");
        dinosaurs[2] = "Microraptor";
        Display(dinosaurs);

        Console.WriteLine("\nRemove(\"Microraptor\")");
        dinosaurs.Remove("Microraptor");
        Display(dinosaurs);

        Console.WriteLine("\nRemoveAt(0)");
        dinosaurs.RemoveAt(0);
        Display(dinosaurs);

        Console.WriteLine("\ndinosaurs.Clear()");
        dinosaurs.Clear();
        Console.WriteLine("Count: {0}", dinosaurs.Count);
    }

    private static void Display(Collection<string> cs)
    {
        Console.WriteLine();
        foreach( string item in cs )
        {
            Console.WriteLine(item);
        }
    }
}

/* This code example produces the following output:

4 dinosaurs:

Psitticosaurus
Caudipteryx
Compsognathus
Muttaburrasaurus

IndexOf("Muttaburrasaurus"): 3

Contains("Caudipteryx"): True

Insert(2, "Nanotyrannus")

Psitticosaurus
Caudipteryx
Nanotyrannus
Compsognathus
Muttaburrasaurus

dinosaurs[2]: Nanotyrannus

dinosaurs[2] = "Microraptor"

Psitticosaurus
Caudipteryx
Microraptor
Compsognathus
Muttaburrasaurus

Remove("Microraptor")

Psitticosaurus
Caudipteryx
Compsognathus
Muttaburrasaurus

RemoveAt(0)

Caudipteryx
Compsognathus
Muttaburrasaurus

dinosaurs.Clear()
Count: 0
 */
using namespace System;
using namespace System::Collections::Generic;
using namespace System::Collections::ObjectModel;

public ref class Demo
{
public:
    static void Main()
    {
        Collection<String^>^ dinosaurs = gcnew Collection<String^>();

        dinosaurs->Add("Psitticosaurus");
        dinosaurs->Add("Caudipteryx");
        dinosaurs->Add("Compsognathus");
        dinosaurs->Add("Muttaburrasaurus");

        Console::WriteLine("{0} dinosaurs:", dinosaurs->Count);
        Display(dinosaurs);

        Console::WriteLine("\nIndexOf(\"Muttaburrasaurus\"): {0}",
            dinosaurs->IndexOf("Muttaburrasaurus"));

        Console::WriteLine("\nContains(\"Caudipteryx\"): {0}",
            dinosaurs->Contains("Caudipteryx"));

        Console::WriteLine("\nInsert(2, \"Nanotyrannus\")");
        dinosaurs->Insert(2, "Nanotyrannus");
        Display(dinosaurs);

        Console::WriteLine("\ndinosaurs[2]: {0}", dinosaurs[2]);

        Console::WriteLine("\ndinosaurs[2] = \"Microraptor\"");
        dinosaurs[2] = "Microraptor";
        Display(dinosaurs);

        Console::WriteLine("\nRemove(\"Microraptor\")");
        dinosaurs->Remove("Microraptor");
        Display(dinosaurs);

        Console::WriteLine("\nRemoveAt(0)");
        dinosaurs->RemoveAt(0);
        Display(dinosaurs);

        Console::WriteLine("\ndinosaurs.Clear()");
        dinosaurs->Clear();
        Console::WriteLine("Count: {0}", dinosaurs->Count);
    }

private:
    static void Display(Collection<String^>^ cs)
    {
        Console::WriteLine();
        for each( String^ item in cs )
        {
            Console::WriteLine(item);
        }
    }
};

int main()
{
    Demo::Main();
}

/* This code example produces the following output:

4 dinosaurs:

Psitticosaurus
Caudipteryx
Compsognathus
Muttaburrasaurus

IndexOf("Muttaburrasaurus"): 3

Contains("Caudipteryx"): True

Insert(2, "Nanotyrannus")

Psitticosaurus
Caudipteryx
Nanotyrannus
Compsognathus
Muttaburrasaurus

dinosaurs[2]: Nanotyrannus

dinosaurs[2] = "Microraptor"

Psitticosaurus
Caudipteryx
Microraptor
Compsognathus
Muttaburrasaurus

Remove("Microraptor")

Psitticosaurus
Caudipteryx
Compsognathus
Muttaburrasaurus

RemoveAt(0)

Caudipteryx
Compsognathus
Muttaburrasaurus

dinosaurs.Clear()
Count: 0
 */

Example 2

The following code example shows how to derive a collection class from a constructed type of the CollectionT generic class, and how to override the protected InsertItem, RemoveItem, ClearItems, and SetItem methods to provide custom behavior for the Add, Insert, Remove, and Clear methods, and for setting the Item property.

The custom behavior provided by this example is a Changed notification event that is raised at the end of each of the protected methods. The Dinosaurs class inherits Collection<string> (Collection(Of String) in Visual Basic) and defines the Changed event, which uses a DinosaursChangedEventArgs class for the event information, and an enumeration to identify the kind of change.

The code example calls several properties and methods of CollectionT to demonstrate the custom event.

Imports System
Imports System.Collections.Generic
Imports System.Collections.ObjectModel

Public Class Dinosaurs
    Inherits Collection(Of String)

    Public Event Changed As EventHandler(Of DinosaursChangedEventArgs)

    Protected Overrides Sub InsertItem( _
        ByVal index As Integer, ByVal newItem As String)

        MyBase.InsertItem(index, newItem)

        RaiseEvent Changed(Me, New DinosaursChangedEventArgs( _
            ChangeType.Added, newItem, Nothing))
    End Sub 

    Protected Overrides Sub SetItem(ByVal index As Integer, _
        ByVal newItem As String)

        Dim replaced As String = Items(index)
        MyBase.SetItem(index, newItem)

        RaiseEvent Changed(Me, New DinosaursChangedEventArgs( _
            ChangeType.Replaced, replaced, newItem))
    End Sub 

    Protected Overrides Sub RemoveItem(ByVal index As Integer)

        Dim removedItem As String = Items(index)
        MyBase.RemoveItem(index)

        RaiseEvent Changed(Me, New DinosaursChangedEventArgs( _
            ChangeType.Removed, removedItem, Nothing))
    End Sub 

    Protected Overrides Sub ClearItems()
        MyBase.ClearItems()

        RaiseEvent Changed(Me, New DinosaursChangedEventArgs( _
            ChangeType.Cleared, Nothing, Nothing))
    End Sub 

End Class 

' Event argument for the Changed event. 
' 
Public Class DinosaursChangedEventArgs
    Inherits EventArgs

    Public ReadOnly ChangedItem As String 
    Public ReadOnly ChangeType As ChangeType
    Public ReadOnly ReplacedWith As String 

    Public Sub New(ByVal change As ChangeType, ByVal item As String, _
        ByVal replacement As String)

        ChangeType = change
        ChangedItem = item
        ReplacedWith = replacement
    End Sub 
End Class 

Public Enum ChangeType
    Added
    Removed
    Replaced
    Cleared
End Enum 

Public Class Demo

    Public Shared Sub Main() 

        Dim dinosaurs As New Dinosaurs

        AddHandler dinosaurs.Changed, AddressOf ChangedHandler

        dinosaurs.Add("Psitticosaurus")
        dinosaurs.Add("Caudipteryx")
        dinosaurs.Add("Compsognathus")
        dinosaurs.Add("Muttaburrasaurus")

        Display(dinosaurs)

        Console.WriteLine(vbLf & "IndexOf(""Muttaburrasaurus""): {0}", _
            dinosaurs.IndexOf("Muttaburrasaurus"))

        Console.WriteLine(vbLf & "Contains(""Caudipteryx""): {0}", _
            dinosaurs.Contains("Caudipteryx"))

        Console.WriteLine(vbLf & "Insert(2, ""Nanotyrannus"")")
        dinosaurs.Insert(2, "Nanotyrannus")

        Console.WriteLine(vbLf & "dinosaurs(2): {0}", dinosaurs(2))

        Console.WriteLine(vbLf & "dinosaurs(2) = ""Microraptor""")
        dinosaurs(2) = "Microraptor"

        Console.WriteLine(vbLf & "Remove(""Microraptor"")")
        dinosaurs.Remove("Microraptor")

        Console.WriteLine(vbLf & "RemoveAt(0)")
        dinosaurs.RemoveAt(0)

        Display(dinosaurs)

    End Sub 

    Private Shared Sub Display(ByVal cs As Collection(Of String)) 
        Console.WriteLine()
        For Each item As String In cs
            Console.WriteLine(item)
        Next item
    End Sub 

    Private Shared Sub ChangedHandler(ByVal source As Object, _
        ByVal e As DinosaursChangedEventArgs)

        If e.ChangeType = ChangeType.Replaced Then
            Console.WriteLine("{0} was replaced with {1}", _
                e.ChangedItem, e.ReplacedWith)

        ElseIf e.ChangeType = ChangeType.Cleared Then
            Console.WriteLine("The dinosaur list was cleared.")

        Else
            Console.WriteLine("{0} was {1}.", _
                e.ChangedItem, e.ChangeType)
        End If 
    End Sub 

End Class 

' This code example produces the following output: 
' 
'Psitticosaurus was Added. 
'Caudipteryx was Added. 
'Compsognathus was Added. 
'Muttaburrasaurus was Added. 
' 
'Psitticosaurus 
'Caudipteryx 
'Compsognathus 
'Muttaburrasaurus 
' 
'IndexOf("Muttaburrasaurus"): 3 
' 
'Contains("Caudipteryx"): True 
' 
'Insert(2, "Nanotyrannus") 
'Nanotyrannus was Added. 
' 
'dinosaurs(2): Nanotyrannus 
' 
'dinosaurs(2) = "Microraptor" 
'Nanotyrannus was replaced with Microraptor 
' 
'Remove("Microraptor") 
'Microraptor was Removed. 
' 
'RemoveAt(0) 
'Psitticosaurus was Removed. 
' 
'Caudipteryx 
'Compsognathus 
'Muttaburrasaurus
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;

public class Dinosaurs : Collection<string>
{
    public event EventHandler<DinosaursChangedEventArgs> Changed;

    protected override void InsertItem(int index, string newItem)
    {
        base.InsertItem(index, newItem);

        EventHandler<DinosaursChangedEventArgs> temp = Changed;
        if (temp != null)
        {
            temp(this, new DinosaursChangedEventArgs(
                ChangeType.Added, newItem, null));
        }
    }

    protected override void SetItem(int index, string newItem)
    {
        string replaced = Items[index];
        base.SetItem(index, newItem);

        EventHandler<DinosaursChangedEventArgs> temp = Changed;
        if (temp != null)
        {
            temp(this, new DinosaursChangedEventArgs(
                ChangeType.Replaced, replaced, newItem));
        }
    }

    protected override void RemoveItem(int index)
    {
        string removedItem = Items[index];
        base.RemoveItem(index);

        EventHandler<DinosaursChangedEventArgs> temp = Changed;
        if (temp != null)
        {
            temp(this, new DinosaursChangedEventArgs(
                ChangeType.Removed, removedItem, null));
        }
    }

    protected override void ClearItems()
    {
        base.ClearItems();

        EventHandler<DinosaursChangedEventArgs> temp = Changed;
        if (temp != null)
        {
            temp(this, new DinosaursChangedEventArgs(
                ChangeType.Cleared, null, null));
        }
    }
}

// Event argument for the Changed event. 
// 
public class DinosaursChangedEventArgs : EventArgs
{
    public readonly string ChangedItem;
    public readonly ChangeType ChangeType;
    public readonly string ReplacedWith;

    public DinosaursChangedEventArgs(ChangeType change, string item, 
        string replacement)
    {
        ChangeType = change;
        ChangedItem = item;
        ReplacedWith = replacement;
    }
}

public enum ChangeType
{
    Added, 
    Removed, 
    Replaced, 
    Cleared
};

public class Demo
{
    public static void Main()
    {
        Dinosaurs dinosaurs = new Dinosaurs();

        dinosaurs.Changed += ChangedHandler; 

        dinosaurs.Add("Psitticosaurus");
        dinosaurs.Add("Caudipteryx");
        dinosaurs.Add("Compsognathus");
        dinosaurs.Add("Muttaburrasaurus");

        Display(dinosaurs);

        Console.WriteLine("\nIndexOf(\"Muttaburrasaurus\"): {0}", 
            dinosaurs.IndexOf("Muttaburrasaurus"));

        Console.WriteLine("\nContains(\"Caudipteryx\"): {0}", 
            dinosaurs.Contains("Caudipteryx"));

        Console.WriteLine("\nInsert(2, \"Nanotyrannus\")");
        dinosaurs.Insert(2, "Nanotyrannus");

        Console.WriteLine("\ndinosaurs[2]: {0}", dinosaurs[2]);

        Console.WriteLine("\ndinosaurs[2] = \"Microraptor\"");
        dinosaurs[2] = "Microraptor";

        Console.WriteLine("\nRemove(\"Microraptor\")");
        dinosaurs.Remove("Microraptor");

        Console.WriteLine("\nRemoveAt(0)");
        dinosaurs.RemoveAt(0);

        Display(dinosaurs);
    }

    private static void Display(Collection<string> cs)
    {
        Console.WriteLine();
        foreach( string item in cs )
        {
            Console.WriteLine(item);
        }
    }

    private static void ChangedHandler(object source, 
        DinosaursChangedEventArgs e)
    {

        if (e.ChangeType==ChangeType.Replaced)
        {
            Console.WriteLine("{0} was replaced with {1}", e.ChangedItem, 
                e.ReplacedWith);
        }
        else if(e.ChangeType==ChangeType.Cleared)
        {
            Console.WriteLine("The dinosaur list was cleared.");
        }
        else
        {
            Console.WriteLine("{0} was {1}.", e.ChangedItem, e.ChangeType);
        }
    }
}

/* This code example produces the following output:

Psitticosaurus was Added.
Caudipteryx was Added.
Compsognathus was Added.
Muttaburrasaurus was Added.

Psitticosaurus
Caudipteryx
Compsognathus
Muttaburrasaurus

IndexOf("Muttaburrasaurus"): 3

Contains("Caudipteryx"): True

Insert(2, "Nanotyrannus")
Nanotyrannus was Added.

dinosaurs[2]: Nanotyrannus

dinosaurs[2] = "Microraptor"
Nanotyrannus was replaced with Microraptor

Remove("Microraptor")
Microraptor was Removed.

RemoveAt(0)
Psitticosaurus was Removed.

Caudipteryx
Compsognathus
Muttaburrasaurus
 */
Version Information

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1
Platforms

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Thread Safety

Public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

A CollectionT can support multiple readers concurrently, as long as the collection is not modified. Even so, enumerating through a collection is intrinsically not a thread-safe procedure. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.

Inheritance Hierarchy
SystemObject
  System.Collections.ObjectModelCollectionT
     System.Collections.ObjectModelKeyedCollectionTKey, TItem
     System.Collections.ObjectModelObservableCollectionT
     System.ComponentModelBindingListT
     System.ComponentModelSortDescriptionCollection
     System.IdentityModel.Protocols.WSTrustRequestClaimCollection
     System.IdentityModel.TokensSecurityTokenHandlerCollection
     System.NetIPEndPointCollection
     System.Net.MailAlternateViewCollection
     System.Net.MailAttachmentCollection
     System.Net.MailLinkedResourceCollection
     System.Net.MailMailAddressCollection
     System.Net.PeerToPeerCloudCollection
     System.Net.PeerToPeer.CollaborationPeerApplicationCollection
     System.Net.PeerToPeer.CollaborationPeerContactCollection
     System.Net.PeerToPeer.CollaborationPeerEndPointCollection
     System.Net.PeerToPeer.CollaborationPeerNearMeCollection
     System.Net.PeerToPeer.CollaborationPeerObjectCollection
     System.Net.PeerToPeerPeerNameRecordCollection
     System.Security.CryptographyCngPropertyCollection
     System.ServiceModel.ChannelsBindingElementCollection
     System.ServiceModel.ChannelsChannelParameterCollection
     System.ServiceModel.DescriptionFaultDescriptionCollection
     System.ServiceModel.DescriptionMessageDescriptionCollection
     System.ServiceModel.DescriptionOperationDescriptionCollection
     System.ServiceModel.DescriptionPolicyAssertionCollection
     System.ServiceModel.DescriptionServiceEndpointCollection
     System.ServiceModel.DispatcherMessageQueryCollection
     System.ServiceModel.SyndicationSyndicationElementExtensionCollection
     System.Web.DynamicDataDataControlReferenceCollection
     System.Web.ModelBindingModelBinderProviderCollection
     System.Web.ModelBindingModelErrorCollection
     System.Web.ModelBindingModelValidatorProviderCollection
     System.Web.ModelBindingValueProviderCollection
     System.Web.RoutingRouteCollection
     System.Web.UI.DataVisualization.ChartingChartElementCollectionT
     System.Web.UIScriptReferenceCollection
     System.Web.UIServiceReferenceCollection
     System.Web.UIUpdatePanelTriggerCollection
     System.WindowsConditionCollection
     System.Windows.Forms.DataVisualization.ChartingChartElementCollectionT
     System.Windows.FormsFileDialogCustomPlacesCollection
     System.Windows.InkStrokeCollection
     System.Windows.Input.StylusPlugInsStylusPlugInCollection
     System.Windows.InputStylusPointCollection
     System.Windows.InputTouchPointCollection
     System.WindowsSetterBaseCollection
     System.WindowsTriggerCollection
     System.Workflow.ComponentModel.CompilerValidationErrorCollection