BlockingCollection<T> Class

Provides blocking and bounding capabilities for thread-safe collections that implement IProducerConsumerCollection<T>.

System::Object
  System.Collections.Concurrent::BlockingCollection<T>

Namespace:  System.Collections.Concurrent
Assembly:  System (in System.dll)

[ComVisibleAttribute(false)]
[HostProtectionAttribute(SecurityAction::LinkDemand, Synchronization = true, 
	ExternalThreading = true)]
generic<typename T>
public ref class BlockingCollection : IEnumerable<T>, 
	ICollection, IEnumerable, IDisposable

Type Parameters

T

The type of elements in the collection.

The BlockingCollection<T> type exposes the following members.

  NameDescription
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsBlockingCollection<T>()Initializes a new instance of the BlockingCollection<T> class without an upper-bound.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsBlockingCollection<T>(Int32)Initializes a new instance of the BlockingCollection<T> class with the specified upper-bound.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsBlockingCollection<T>(IProducerConsumerCollection<T>)Initializes a new instance of the BlockingCollection<T> class without an upper-bound and using the provided IProducerConsumerCollection<T> as its underlying data store.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsBlockingCollection<T>(IProducerConsumerCollection<T>, Int32)Initializes a new instance of the BlockingCollection<T> class with the specified upper-bound and using the provided IProducerConsumerCollection<T> as its underlying data store.
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  NameDescription
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsBoundedCapacityGets the bounded capacity of this BlockingCollection<T> instance.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsCountGets the number of items contained in the BlockingCollection<T>.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsIsAddingCompletedGets whether this BlockingCollection<T> has been marked as complete for adding.
Public propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsIsCompletedGets whether this BlockingCollection<T> has been marked as complete for adding and is empty.
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  NameDescription
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAdd(T)Adds the item to the BlockingCollection<T>.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAdd(T, CancellationToken)Adds the item to the BlockingCollection<T>.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsAddToAny(array<BlockingCollection<T>>, T)Adds the specified item to any one of the specified BlockingCollection<T> instances.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsAddToAny(array<BlockingCollection<T>>, T, CancellationToken)Adds the specified item to any one of the specified BlockingCollection<T> instances.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsCompleteAddingMarks the BlockingCollection<T> instances as not accepting any more additions.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsCopyToCopies all of the items in the BlockingCollection<T> instance to a compatible one-dimensional array, starting at the specified index of the target array.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsDispose()Releases all resources used by the current instance of the BlockingCollection<T> class.
Protected methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsDispose(Boolean)Releases resources used by the BlockingCollection<T> instance.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsEquals(Object)Determines whether the specified object is equal to the current object. (Inherited from Object.)
Protected methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetConsumingEnumerable()Provides a consuming IEnumerator<T> for items in the collection.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetConsumingEnumerable(CancellationToken)Provides a consuming IEnumerable<T> for items in the collection.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetHashCodeServes as the default hash function. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTake()Removes an item from the BlockingCollection<T>.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTake(CancellationToken)Removes an item from the BlockingCollection<T>.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTakeFromAny(array<BlockingCollection<T>>, T%)Takes an item from any one of the specified BlockingCollection<T> instances.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTakeFromAny(array<BlockingCollection<T>>, T%, CancellationToken)Takes an item from any one of the specified BlockingCollection<T> instances while observing the specified cancellation token.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToArrayCopies the items from the BlockingCollection<T> instance into a new array.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToStringReturns a string that represents the current object. (Inherited from Object.)
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryAdd(T)Tries to add the specified item to the BlockingCollection<T>.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryAdd(T, Int32)Tries to add the specified item to the BlockingCollection<T> within the specified time period.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryAdd(T, TimeSpan)Tries to add the specified item to the BlockingCollection<T>.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryAdd(T, Int32, CancellationToken)Tries to add the specified item to the BlockingCollection<T> within the specified time period, while observing a cancellation token.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryAddToAny(array<BlockingCollection<T>>, T)Tries to add the specified item to any one of the specified BlockingCollection<T> instances.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryAddToAny(array<BlockingCollection<T>>, T, Int32)Tries to add the specified item to any one of the specified BlockingCollection<T> instances.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryAddToAny(array<BlockingCollection<T>>, T, TimeSpan)Tries to add the specified item to any one of the specified BlockingCollection<T> instances while observing the specified cancellation token.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryAddToAny(array<BlockingCollection<T>>, T, Int32, CancellationToken)Tries to add the specified item to any one of the specified BlockingCollection<T> instances.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryTake(T%)Tries to remove an item from the BlockingCollection<T>.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryTake(T%, Int32)Tries to remove an item from the BlockingCollection<T> in the specified time period.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryTake(T%, TimeSpan)Tries to remove an item from the BlockingCollection<T> in the specified time period.
Public methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryTake(T%, Int32, CancellationToken)Tries to remove an item from the BlockingCollection<T> in the specified time period while observing a cancellation token.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryTakeFromAny(array<BlockingCollection<T>>, T%)Tries to remove an item from any one of the specified BlockingCollection<T> instances.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryTakeFromAny(array<BlockingCollection<T>>, T%, Int32)Tries to remove an item from any one of the specified BlockingCollection<T> instances.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryTakeFromAny(array<BlockingCollection<T>>, T%, TimeSpan)Tries to remove an item from any one of the specified BlockingCollection<T> instances.
Public methodStatic memberSupported by Portable Class LibrarySupported in .NET for Windows Store appsTryTakeFromAny(array<BlockingCollection<T>>, T%, Int32, CancellationToken)Tries to remove an item from any one of the specified BlockingCollection<T> instances.
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  NameDescription
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAggregate<T>(Func<T, T, T>)Overloaded. Applies an accumulator function over a sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAggregate<T, TAccumulate>(TAccumulate, Func<TAccumulate, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAggregate<T, TAccumulate, TResult>(TAccumulate, Func<TAccumulate, T, TAccumulate>, Func<TAccumulate, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAll<T>Determines whether all elements of a sequence satisfy a condition. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAny<T>()Overloaded. Determines whether a sequence contains any elements. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAny<T>(Func<T, Boolean>)Overloaded. Determines whether any element of a sequence satisfies a condition. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAsEnumerable<T>Returns the input typed as IEnumerable<T>. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAsParallel()Overloaded. Enables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAsParallel<T>()Overloaded. Enables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAsQueryable()Overloaded. Converts an IEnumerable to an IQueryable. (Defined by Queryable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAsQueryable<T>()Overloaded. Converts a generic IEnumerable<T> to a generic IQueryable<T>. (Defined by Queryable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, Nullable<Decimal>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, Nullable<Double>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, Nullable<Int32>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, Nullable<Int64>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsAverage<T>(Func<T, Nullable<Single>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsCast<TResult>Casts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsConcat<T>Concatenates two sequences. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsContains<T>(T)Overloaded. Determines whether a sequence contains a specified element by using the default equality comparer. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsContains<T>(T, IEqualityComparer<T>)Overloaded. Determines whether a sequence contains a specified element by using a specified IEqualityComparer<T>. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsCount<T>()Overloaded. Returns the number of elements in a sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsCount<T>(Func<T, Boolean>)Overloaded. Returns a number that represents how many elements in the specified sequence satisfy a condition. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsDefaultIfEmpty<T>()Overloaded. 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsDefaultIfEmpty<T>(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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsDistinct<T>()Overloaded. Returns distinct elements from a sequence by using the default equality comparer to compare values. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsDistinct<T>(IEqualityComparer<T>)Overloaded. Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsElementAt<T>Returns the element at a specified index in a sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsElementAtOrDefault<T>Returns 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsExcept<T>(IEnumerable<T>)Overloaded. Produces the set difference of two sequences by using the default equality comparer to compare values. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsExcept<T>(IEnumerable<T>, IEqualityComparer<T>)Overloaded. Produces the set difference of two sequences by using the specified IEqualityComparer<T> to compare values. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsFirst<T>()Overloaded. Returns the first element of a sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsFirst<T>(Func<T, Boolean>)Overloaded. Returns the first element in a sequence that satisfies a specified condition. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsFirstOrDefault<T>()Overloaded. Returns the first element of a sequence, or a default value if the sequence contains no elements. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsFirstOrDefault<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupBy<T, TKey>(Func<T, TKey>)Overloaded. Groups the elements of a sequence according to a specified key selector function. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupBy<T, TKey>(Func<T, TKey>, IEqualityComparer<TKey>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupBy<T, TKey, TElement>(Func<T, TKey>, Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupBy<T, TKey, TResult>(Func<T, TKey>, Func<TKey, IEnumerable<T>, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupBy<T, TKey, TElement>(Func<T, TKey>, Func<T, TElement>, IEqualityComparer<TKey>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupBy<T, TKey, TResult>(Func<T, TKey>, Func<TKey, IEnumerable<T>, TResult>, IEqualityComparer<TKey>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupBy<T, TKey, TElement, TResult>(Func<T, TKey>, Func<T, TElement>, Func<TKey, IEnumerable<TElement>, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupBy<T, TKey, TElement, TResult>(Func<T, TKey>, Func<T, TElement>, Func<TKey, IEnumerable<TElement>, TResult>, IEqualityComparer<TKey>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupJoin<T, TInner, TKey, TResult>(IEnumerable<TInner>, Func<T, TKey>, Func<TInner, TKey>, Func<T, IEnumerable<TInner>, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsGroupJoin<T, TInner, TKey, TResult>(IEnumerable<TInner>, Func<T, TKey>, Func<TInner, TKey>, Func<T, IEnumerable<TInner>, TResult>, IEqualityComparer<TKey>)Overloaded. Correlates the elements of two sequences based on key equality and groups the results. A specified IEqualityComparer<T> is used to compare keys. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsIntersect<T>(IEnumerable<T>)Overloaded. Produces the set intersection of two sequences by using the default equality comparer to compare values. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsIntersect<T>(IEnumerable<T>, IEqualityComparer<T>)Overloaded. Produces the set intersection of two sequences by using the specified IEqualityComparer<T> to compare values. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsJoin<T, TInner, TKey, TResult>(IEnumerable<TInner>, Func<T, TKey>, Func<TInner, TKey>, Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsJoin<T, TInner, TKey, TResult>(IEnumerable<TInner>, Func<T, TKey>, Func<TInner, TKey>, Func<T, TInner, TResult>, IEqualityComparer<TKey>)Overloaded. Correlates the elements of two sequences based on matching keys. A specified IEqualityComparer<T> is used to compare keys. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsLast<T>()Overloaded. Returns the last element of a sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsLast<T>(Func<T, Boolean>)Overloaded. Returns the last element of a sequence that satisfies a specified condition. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsLastOrDefault<T>()Overloaded. Returns the last element of a sequence, or a default value if the sequence contains no elements. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsLastOrDefault<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsLongCount<T>()Overloaded. Returns an Int64 that represents the total number of elements in a sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsLongCount<T>(Func<T, Boolean>)Overloaded. Returns an Int64 that represents how many elements in a sequence satisfy a condition. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>()Overloaded. Returns the maximum value in a generic sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Decimal>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Decimal value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Nullable<Decimal>>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Decimal value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Double>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Double value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Nullable<Double>>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Double value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Int32>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Int32 value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Nullable<Int32>>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Int32 value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Int64>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Int64 value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Nullable<Int64>>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Int64 value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Single>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Single value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T>(Func<T, Nullable<Single>>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum nullable Single value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMax<T, TResult>(Func<T, TResult>)Overloaded. Invokes a transform function on each element of a generic sequence and returns the maximum resulting value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>()Overloaded. Returns the minimum value in a generic sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Decimal>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Decimal value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Nullable<Decimal>>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Decimal value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Double>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Double value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Nullable<Double>>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Double value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Int32>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Int32 value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Nullable<Int32>>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Int32 value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Int64>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Int64 value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Nullable<Int64>>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Int64 value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Single>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Single value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T>(Func<T, Nullable<Single>>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum nullable Single value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsMin<T, TResult>(Func<T, TResult>)Overloaded. Invokes a transform function on each element of a generic sequence and returns the minimum resulting value. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsOfType<TResult>Filters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsOrderBy<T, TKey>(Func<T, TKey>)Overloaded. Sorts the elements of a sequence in ascending order according to a key. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsOrderBy<T, TKey>(Func<T, TKey>, IComparer<TKey>)Overloaded. Sorts the elements of a sequence in ascending order by using a specified comparer. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsOrderByDescending<T, TKey>(Func<T, TKey>)Overloaded. Sorts the elements of a sequence in descending order according to a key. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsOrderByDescending<T, TKey>(Func<T, TKey>, IComparer<TKey>)Overloaded. Sorts the elements of a sequence in descending order by using a specified comparer. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsReverse<T>Inverts the order of the elements in a sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSelect<T, TResult>(Func<T, TResult>)Overloaded. Projects each element of a sequence into a new form. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSelect<T, TResult>(Func<T, Int32, TResult>)Overloaded. Projects each element of a sequence into a new form by incorporating the element's index. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSelectMany<T, TResult>(Func<T, IEnumerable<TResult>>)Overloaded. Projects each element of a sequence to an IEnumerable<T> and flattens the resulting sequences into one sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSelectMany<T, TResult>(Func<T, Int32, IEnumerable<TResult>>)Overloaded. Projects each element of a sequence to an IEnumerable<T>, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSelectMany<T, TCollection, TResult>(Func<T, Int32, IEnumerable<TCollection>>, Func<T, TCollection, TResult>)Overloaded. Projects each element of a sequence to an IEnumerable<T>, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSelectMany<T, TCollection, TResult>(Func<T, IEnumerable<TCollection>>, Func<T, TCollection, TResult>)Overloaded. Projects each element of a sequence to an IEnumerable<T>, flattens the resulting sequences into one sequence, and invokes a result selector function on each element therein. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSequenceEqual<T>(IEnumerable<T>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSequenceEqual<T>(IEnumerable<T>, IEqualityComparer<T>)Overloaded. Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSingle<T>()Overloaded. 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSingle<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSingleOrDefault<T>()Overloaded. 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSingleOrDefault<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSkip<T>Bypasses a specified number of elements in a sequence and then returns the remaining elements. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSkipWhile<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSkipWhile<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, Nullable<Decimal>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, Nullable<Double>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, Nullable<Int32>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, Nullable<Int64>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsSum<T>(Func<T, Nullable<Single>>)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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTake<T>Returns a specified number of contiguous elements from the start of a sequence. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTakeWhile<T>(Func<T, Boolean>)Overloaded. Returns elements from a sequence as long as a specified condition is true. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsTakeWhile<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToArray<T>Creates an array from a IEnumerable<T>. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToDictionary<T, TKey>(Func<T, TKey>)Overloaded. Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to a specified key selector function. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToDictionary<T, TKey>(Func<T, TKey>, IEqualityComparer<TKey>)Overloaded. Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to a specified key selector function and key comparer. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToDictionary<T, TKey, TElement>(Func<T, TKey>, Func<T, TElement>)Overloaded. Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to specified key selector and element selector functions. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToDictionary<T, TKey, TElement>(Func<T, TKey>, Func<T, TElement>, IEqualityComparer<TKey>)Overloaded. Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to a specified key selector function, a comparer, and an element selector function. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToList<T>Creates a List<T> from an IEnumerable<T>. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToLookup<T, TKey>(Func<T, TKey>)Overloaded. Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToLookup<T, TKey>(Func<T, TKey>, IEqualityComparer<TKey>)Overloaded. Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function and key comparer. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToLookup<T, TKey, TElement>(Func<T, TKey>, Func<T, TElement>)Overloaded. Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to specified key selector and element selector functions. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsToLookup<T, TKey, TElement>(Func<T, TKey>, Func<T, TElement>, IEqualityComparer<TKey>)Overloaded. Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function, a comparer and an element selector function. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsUnion<T>(IEnumerable<T>)Overloaded. Produces the set union of two sequences by using the default equality comparer. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsUnion<T>(IEnumerable<T>, IEqualityComparer<T>)Overloaded. Produces the set union of two sequences by using a specified IEqualityComparer<T>. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsWhere<T>(Func<T, Boolean>)Overloaded. Filters a sequence of values based on a predicate. (Defined by Enumerable.)
Public Extension MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsWhere<T>(Func<T, 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 MethodSupported by Portable Class LibrarySupported in .NET for Windows Store appsZip<T, TSecond, TResult>Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results. (Defined by Enumerable.)
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  NameDescription
Explicit interface implemetationPrivate methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsICollection::CopyToCopies all of the items in the BlockingCollection<T> instance to a compatible one-dimensional array, starting at the specified index of the target array.
Explicit interface implemetationPrivate propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsICollection::IsSynchronizedGets a value indicating whether access to the ICollection is synchronized.
Explicit interface implemetationPrivate propertySupported by Portable Class LibrarySupported in .NET for Windows Store appsICollection::SyncRootGets an object that can be used to synchronize access to the ICollection. This property is not supported.
Explicit interface implemetationPrivate methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsIEnumerable<T>::GetEnumeratorProvides an IEnumerator<T> for items in the collection.
Explicit interface implemetationPrivate methodSupported by Portable Class LibrarySupported in .NET for Windows Store appsIEnumerable::GetEnumeratorProvides an IEnumerator for items in the collection.
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BlockingCollection<T> is a thread-safe collection class that provides the following:

  • An implementation of the producer/consumer pattern; BlockingCollection<T> is a wrapper for the IProducerConsumerCollection<T> interface.

  • Concurrent addition and removal of items from multiple threads with the Add and Take methods.

  • A bounded collection that blocks Add and Take operations when the collection is full or empty.

  • Cancellation of Add or Take operations by using a CancellationToken object in the TryAdd or TryTake method.

Important noteImportant

This type implements the IDisposable interface. When you have finished using the type, you should dispose of it either directly or indirectly. To dispose of the type directly, call its Dispose method in a try/catch block. To dispose of it indirectly, use a language construct such as using (in C#) or Using (in Visual Basic). For more information, see the “Using an Object that Implements IDisposable” section in the IDisposable interface topic. Also, note that the Dispose() method is not thread-safe. All other public and protected members of BlockingCollection<T> are thread-safe and may be used concurrently from multiple threads.

IProducerConsumerCollection<T> represents a collection that allows for thread-safe adding and removal of data. BlockingCollection<T> is used as a wrapper for an IProducerConsumerCollection<T> instance, and allows removal attempts from the collection to block until data is available to be removed. Similarly, you can create a BlockingCollection<T> to enforce an upper bound on the number of data elements allowed in the IProducerConsumerCollection<T>; addition attempts to the collection may then block until space is available to store the added items. In this manner, BlockingCollection<T> is similar to a traditional blocking queue data structure, except that the underlying data storage mechanism is abstracted away as an IProducerConsumerCollection<T>.

BlockingCollection<T> supports bounding and blocking. Bounding means that you can set the maximum capacity of the collection. Bounding is important in certain scenarios because it enables you to control the maximum size of the collection in memory, and it prevents the producing threads from moving too far ahead of the consuming threads.Multiple threads or tasks can add items to the collection concurrently, and if the collection reaches its specified maximum capacity, the producing threads will block until an item is removed. Multiple consumers can remove items concurrently, and if the collection becomes empty, the consuming threads will block until a producer adds an item. A producing thread can call the CompleteAdding method to indicate that no more items will be added. Consumers monitor the IsCompleted property to know when the collection is empty and no more items will be added.

Add and Take operations are typically performed in a loop. You can cancel a loop by passing in a CancellationToken object to the TryAdd or TryTake method, and then checking the value of the token's IsCancellationRequested property on each iteration. If the value is true, it is up to you to respond the cancellation request by cleaning up any resources and exiting the loop.

When you create a BlockingCollection<T> object, you can specify not only the bounded capacity but also the type of collection to use. For example, you could specify a ConcurrentQueue<T> object for first in, first out (FIFO) behavior, or a ConcurrentStack<T> object for last in, first out (LIFO) behavior. You can use any collection class that implements the IProducerConsumerCollection<T> interface. The default collection type for BlockingCollection<T> is ConcurrentQueue<T>.

Do not modify the underlying collection directly. Use BlockingCollection<T> methods to add or remove elements. The BlockingCollection<T> object can become corrupted if you change the underlying collection directly.

NoteNote

The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: Synchronization | ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.

The following example shows how to add and take items concurrently from a blocking collection:

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.5, 4

.NET Framework Client Profile

Supported in: 4

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 8.1, 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.

The Dispose method is not thread-safe. All other public and protected members of BlockingCollection<T> are thread-safe and may be used concurrently from multiple threads.

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