Export (0) Print
Expand All

EntityCollection<TEntity> Class

Represents a collection of objects on the "many" end of a relationship.

System.Object
  System.Data.Objects.DataClasses.RelatedEnd
    System.Data.Objects.DataClasses.EntityCollection<TEntity>

Namespace:  System.Data.Objects.DataClasses
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

[SerializableAttribute]
public sealed class EntityCollection<TEntity> : RelatedEnd, 
	ICollection<TEntity>, IEnumerable<TEntity>, IEnumerable, IListSource
where TEntity : class

Type Parameters

TEntity

The entity type of the collection.

The EntityCollection<TEntity> type exposes the following members.

  NameDescription
Public methodEntityCollection<TEntity>Initializes a new instance of the EntityCollection<TEntity> class.
Top

  NameDescription
Public propertyCountGets the number of objects that are contained in the collection.
Public propertyIsLoadedGets a value that indicates whether all related objects have been loaded. (Inherited from RelatedEnd.)
Public propertyIsReadOnlyGets a value that indicates whether the EntityCollection<TEntity> is read-only.
Public propertyRelationshipNameGets the name of the relationship in which this related end participates. (Inherited from RelatedEnd.)
Public propertyRelationshipSetReturns a reference to the metadata for the related end. (Inherited from RelatedEnd.)
Public propertySourceRoleNameGets the role name at the source end of the relationship. (Inherited from RelatedEnd.)
Public propertyTargetRoleNameGets the role name at the target end of the relationship. (Inherited from RelatedEnd.)
Top

  NameDescription
Public methodAddAdds an object to the collection.
Public methodAttach(TEntity)Defines a relationship between two attached objects in an object context.
Public methodAttach(IEnumerable<TEntity>)Defines relationships between an object and a collection of related objects in an object context.
Public methodClearRemoves all entities from the collection.
Public methodContainsDetermines whether a specific object exists in the collection.
Public methodCopyToCopies all the contents of the collection to an array, starting at the specified index of the target array.
Public methodCreateSourceQueryReturns an object query that, when it is executed, returns the same set of objects that exists in the current collection.
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetEnumeratorReturns an enumerator that is used to iterate through the objects in the collection.
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodLoad()When overridden in a derived class, loads the related object or objects into the related end with the default merge option. (Inherited from RelatedEnd.)
Public methodLoad(MergeOption)Loads related objects into the collection, using the specified merge option. (Overrides RelatedEnd.Load(MergeOption).)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodOnCollectionDeserializedInfrastructure. Used internally to deserialize entity objects.
Public methodOnDeserializedInfrastructure. Used internally to deserialize entity objects along with the RelationshipManager instances. (Inherited from RelatedEnd.)
Public methodOnSerializingInfrastructure. Used internally to serialize entity objects.
Public methodRemoveRemoves an object from the collection and marks the relationship for deletion.
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
Top

  NameDescription
Public eventAssociationChangedOccurs when a change is made to a related end. (Inherited from RelatedEnd.)
Top

  NameDescription
Public Extension MethodAggregate<TEntity>(Func<TEntity, TEntity, TEntity>)Overloaded. Applies an accumulator function over a sequence. (Defined by Enumerable.)
Public Extension MethodAggregate<TEntity, TAccumulate>(TAccumulate, Func<TAccumulate, TEntity, 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 MethodAggregate<TEntity, TAccumulate, TResult>(TAccumulate, Func<TAccumulate, TEntity, 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 MethodAll<TEntity>Determines whether all elements of a sequence satisfy a condition. (Defined by Enumerable.)
Public Extension MethodAny<TEntity>()Overloaded. Determines whether a sequence contains any elements. (Defined by Enumerable.)
Public Extension MethodAny<TEntity>(Func<TEntity, Boolean>)Overloaded. Determines whether any element of a sequence satisfies a condition. (Defined by Enumerable.)
Public Extension MethodAsEnumerable<TEntity>Returns the input typed as IEnumerable<T>. (Defined by Enumerable.)
Public Extension MethodAsParallel()Overloaded. Enables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension MethodAsParallel<TEntity>()Overloaded. Enables parallelization of a query. (Defined by ParallelEnumerable.)
Public Extension MethodAsQueryable()Overloaded. Converts an IEnumerable to an IQueryable. (Defined by Queryable.)
Public Extension MethodAsQueryable<TEntity>()Overloaded. Converts a generic IEnumerable<T> to a generic IQueryable<T>. (Defined by Queryable.)
Public Extension MethodAverage<TEntity>(Func<TEntity, 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 MethodAverage<TEntity>(Func<TEntity, 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 MethodAverage<TEntity>(Func<TEntity, 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 MethodAverage<TEntity>(Func<TEntity, 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 MethodAverage<TEntity>(Func<TEntity, 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 MethodAverage<TEntity>(Func<TEntity, 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 MethodAverage<TEntity>(Func<TEntity, 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 MethodAverage<TEntity>(Func<TEntity, 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 MethodAverage<TEntity>(Func<TEntity, 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 MethodAverage<TEntity>(Func<TEntity, 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 MethodCast<TResult>Converts the elements of an IEnumerable to the specified type. (Defined by Enumerable.)
Public Extension MethodConcat<TEntity>Concatenates two sequences. (Defined by Enumerable.)
Public Extension MethodContains<TEntity>(TEntity)Overloaded. Determines whether a sequence contains a specified element by using the default equality comparer. (Defined by Enumerable.)
Public Extension MethodContains<TEntity>(TEntity, IEqualityComparer<TEntity>)Overloaded. Determines whether a sequence contains a specified element by using a specified IEqualityComparer<T>. (Defined by Enumerable.)
Public Extension MethodCount<TEntity>()Overloaded. Returns the number of elements in a sequence. (Defined by Enumerable.)
Public Extension MethodCount<TEntity>(Func<TEntity, Boolean>)Overloaded. Returns a number that represents how many elements in the specified sequence satisfy a condition. (Defined by Enumerable.)
Public Extension MethodDefaultIfEmpty<TEntity>()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 MethodDefaultIfEmpty<TEntity>(TEntity)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 MethodDistinct<TEntity>()Overloaded. Returns distinct elements from a sequence by using the default equality comparer to compare values. (Defined by Enumerable.)
Public Extension MethodDistinct<TEntity>(IEqualityComparer<TEntity>)Overloaded. Returns distinct elements from a sequence by using a specified IEqualityComparer<T> to compare values. (Defined by Enumerable.)
Public Extension MethodElementAt<TEntity>Returns the element at a specified index in a sequence. (Defined by Enumerable.)
Public Extension MethodElementAtOrDefault<TEntity>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 MethodExcept<TEntity>(IEnumerable<TEntity>)Overloaded. Produces the set difference of two sequences by using the default equality comparer to compare values. (Defined by Enumerable.)
Public Extension MethodExcept<TEntity>(IEnumerable<TEntity>, IEqualityComparer<TEntity>)Overloaded. Produces the set difference of two sequences by using the specified IEqualityComparer<T> to compare values. (Defined by Enumerable.)
Public Extension MethodFirst<TEntity>()Overloaded. Returns the first element of a sequence. (Defined by Enumerable.)
Public Extension MethodFirst<TEntity>(Func<TEntity, Boolean>)Overloaded. Returns the first element in a sequence that satisfies a specified condition. (Defined by Enumerable.)
Public Extension MethodFirstOrDefault<TEntity>()Overloaded. Returns the first element of a sequence, or a default value if the sequence contains no elements. (Defined by Enumerable.)
Public Extension MethodFirstOrDefault<TEntity>(Func<TEntity, 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 MethodGroupBy<TEntity, TKey>(Func<TEntity, TKey>)Overloaded. Groups the elements of a sequence according to a specified key selector function. (Defined by Enumerable.)
Public Extension MethodGroupBy<TEntity, TKey>(Func<TEntity, 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 MethodGroupBy<TEntity, TKey, TElement>(Func<TEntity, TKey>, Func<TEntity, 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 MethodGroupBy<TEntity, TKey, TResult>(Func<TEntity, TKey>, Func<TKey, IEnumerable<TEntity>, 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 MethodGroupBy<TEntity, TKey, TElement>(Func<TEntity, TKey>, Func<TEntity, 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 MethodGroupBy<TEntity, TKey, TResult>(Func<TEntity, TKey>, Func<TKey, IEnumerable<TEntity>, 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 MethodGroupBy<TEntity, TKey, TElement, TResult>(Func<TEntity, TKey>, Func<TEntity, 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 MethodGroupBy<TEntity, TKey, TElement, TResult>(Func<TEntity, TKey>, Func<TEntity, 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 MethodGroupJoin<TEntity, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TEntity, TKey>, Func<TInner, TKey>, Func<TEntity, 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 MethodGroupJoin<TEntity, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TEntity, TKey>, Func<TInner, TKey>, Func<TEntity, 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 MethodIntersect<TEntity>(IEnumerable<TEntity>)Overloaded. Produces the set intersection of two sequences by using the default equality comparer to compare values. (Defined by Enumerable.)
Public Extension MethodIntersect<TEntity>(IEnumerable<TEntity>, IEqualityComparer<TEntity>)Overloaded. Produces the set intersection of two sequences by using the specified IEqualityComparer<T> to compare values. (Defined by Enumerable.)
Public Extension MethodJoin<TEntity, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TEntity, TKey>, Func<TInner, TKey>, Func<TEntity, 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 MethodJoin<TEntity, TInner, TKey, TResult>(IEnumerable<TInner>, Func<TEntity, TKey>, Func<TInner, TKey>, Func<TEntity, 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 MethodLast<TEntity>()Overloaded. Returns the last element of a sequence. (Defined by Enumerable.)
Public Extension MethodLast<TEntity>(Func<TEntity, Boolean>)Overloaded. Returns the last element of a sequence that satisfies a specified condition. (Defined by Enumerable.)
Public Extension MethodLastOrDefault<TEntity>()Overloaded. Returns the last element of a sequence, or a default value if the sequence contains no elements. (Defined by Enumerable.)
Public Extension MethodLastOrDefault<TEntity>(Func<TEntity, 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 MethodLongCount<TEntity>()Overloaded. Returns an Int64 that represents the total number of elements in a sequence. (Defined by Enumerable.)
Public Extension MethodLongCount<TEntity>(Func<TEntity, Boolean>)Overloaded. Returns an Int64 that represents how many elements in a sequence satisfy a condition. (Defined by Enumerable.)
Public Extension MethodMax<TEntity>()Overloaded. Returns the maximum value in a generic sequence. (Defined by Enumerable.)
Public Extension MethodMax<TEntity>(Func<TEntity, Decimal>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Decimal value. (Defined by Enumerable.)
Public Extension MethodMax<TEntity>(Func<TEntity, 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 MethodMax<TEntity>(Func<TEntity, Double>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Double value. (Defined by Enumerable.)
Public Extension MethodMax<TEntity>(Func<TEntity, 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 MethodMax<TEntity>(Func<TEntity, Int32>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Int32 value. (Defined by Enumerable.)
Public Extension MethodMax<TEntity>(Func<TEntity, 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 MethodMax<TEntity>(Func<TEntity, Int64>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Int64 value. (Defined by Enumerable.)
Public Extension MethodMax<TEntity>(Func<TEntity, 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 MethodMax<TEntity>(Func<TEntity, Single>)Overloaded. Invokes a transform function on each element of a sequence and returns the maximum Single value. (Defined by Enumerable.)
Public Extension MethodMax<TEntity>(Func<TEntity, 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 MethodMax<TEntity, TResult>(Func<TEntity, TResult>)Overloaded. Invokes a transform function on each element of a generic sequence and returns the maximum resulting value. (Defined by Enumerable.)
Public Extension MethodMin<TEntity>()Overloaded. Returns the minimum value in a generic sequence. (Defined by Enumerable.)
Public Extension MethodMin<TEntity>(Func<TEntity, Decimal>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Decimal value. (Defined by Enumerable.)
Public Extension MethodMin<TEntity>(Func<TEntity, 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 MethodMin<TEntity>(Func<TEntity, Double>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Double value. (Defined by Enumerable.)
Public Extension MethodMin<TEntity>(Func<TEntity, 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 MethodMin<TEntity>(Func<TEntity, Int32>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Int32 value. (Defined by Enumerable.)
Public Extension MethodMin<TEntity>(Func<TEntity, 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 MethodMin<TEntity>(Func<TEntity, Int64>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Int64 value. (Defined by Enumerable.)
Public Extension MethodMin<TEntity>(Func<TEntity, 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 MethodMin<TEntity>(Func<TEntity, Single>)Overloaded. Invokes a transform function on each element of a sequence and returns the minimum Single value. (Defined by Enumerable.)
Public Extension MethodMin<TEntity>(Func<TEntity, 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 MethodMin<TEntity, TResult>(Func<TEntity, TResult>)Overloaded. Invokes a transform function on each element of a generic sequence and returns the minimum resulting value. (Defined by Enumerable.)
Public Extension MethodOfType<TResult>Filters the elements of an IEnumerable based on a specified type. (Defined by Enumerable.)
Public Extension MethodOrderBy<TEntity, TKey>(Func<TEntity, TKey>)Overloaded. Sorts the elements of a sequence in ascending order according to a key. (Defined by Enumerable.)
Public Extension MethodOrderBy<TEntity, TKey>(Func<TEntity, TKey>, IComparer<TKey>)Overloaded. Sorts the elements of a sequence in ascending order by using a specified comparer. (Defined by Enumerable.)
Public Extension MethodOrderByDescending<TEntity, TKey>(Func<TEntity, TKey>)Overloaded. Sorts the elements of a sequence in descending order according to a key. (Defined by Enumerable.)
Public Extension MethodOrderByDescending<TEntity, TKey>(Func<TEntity, TKey>, IComparer<TKey>)Overloaded. Sorts the elements of a sequence in descending order by using a specified comparer. (Defined by Enumerable.)
Public Extension MethodReverse<TEntity>Inverts the order of the elements in a sequence. (Defined by Enumerable.)
Public Extension MethodSelect<TEntity, TResult>(Func<TEntity, TResult>)Overloaded. Projects each element of a sequence into a new form. (Defined by Enumerable.)
Public Extension MethodSelect<TEntity, TResult>(Func<TEntity, Int32, TResult>)Overloaded. Projects each element of a sequence into a new form by incorporating the element's index. (Defined by Enumerable.)
Public Extension MethodSelectMany<TEntity, TResult>(Func<TEntity, 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 MethodSelectMany<TEntity, TResult>(Func<TEntity, 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 MethodSelectMany<TEntity, TCollection, TResult>(Func<TEntity, Int32, IEnumerable<TCollection>>, Func<TEntity, 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 MethodSelectMany<TEntity, TCollection, TResult>(Func<TEntity, IEnumerable<TCollection>>, Func<TEntity, 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 MethodSequenceEqual<TEntity>(IEnumerable<TEntity>)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 MethodSequenceEqual<TEntity>(IEnumerable<TEntity>, IEqualityComparer<TEntity>)Overloaded. Determines whether two sequences are equal by comparing their elements by using a specified IEqualityComparer<T>. (Defined by Enumerable.)
Public Extension MethodSingle<TEntity>()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 MethodSingle<TEntity>(Func<TEntity, 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 MethodSingleOrDefault<TEntity>()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 MethodSingleOrDefault<TEntity>(Func<TEntity, 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 MethodSkip<TEntity>Bypasses a specified number of elements in a sequence and then returns the remaining elements. (Defined by Enumerable.)
Public Extension MethodSkipWhile<TEntity>(Func<TEntity, 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 MethodSkipWhile<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodSum<TEntity>(Func<TEntity, 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 MethodTake<TEntity>Returns a specified number of contiguous elements from the start of a sequence. (Defined by Enumerable.)
Public Extension MethodTakeWhile<TEntity>(Func<TEntity, Boolean>)Overloaded. Returns elements from a sequence as long as a specified condition is true. (Defined by Enumerable.)
Public Extension MethodTakeWhile<TEntity>(Func<TEntity, 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 MethodToArray<TEntity>Creates an array from a IEnumerable<T>. (Defined by Enumerable.)
Public Extension MethodToDictionary<TEntity, TKey>(Func<TEntity, TKey>)Overloaded. Creates a Dictionary<TKey, TValue> from an IEnumerable<T> according to a specified key selector function. (Defined by Enumerable.)
Public Extension MethodToDictionary<TEntity, TKey>(Func<TEntity, 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 MethodToDictionary<TEntity, TKey, TElement>(Func<TEntity, TKey>, Func<TEntity, 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 MethodToDictionary<TEntity, TKey, TElement>(Func<TEntity, TKey>, Func<TEntity, 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 MethodToList<TEntity>Creates a List<T> from an IEnumerable<T>. (Defined by Enumerable.)
Public Extension MethodToLookup<TEntity, TKey>(Func<TEntity, TKey>)Overloaded. Creates a Lookup<TKey, TElement> from an IEnumerable<T> according to a specified key selector function. (Defined by Enumerable.)
Public Extension MethodToLookup<TEntity, TKey>(Func<TEntity, 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 MethodToLookup<TEntity, TKey, TElement>(Func<TEntity, TKey>, Func<TEntity, 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 MethodToLookup<TEntity, TKey, TElement>(Func<TEntity, TKey>, Func<TEntity, 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 MethodUnion<TEntity>(IEnumerable<TEntity>)Overloaded. Produces the set union of two sequences by using the default equality comparer. (Defined by Enumerable.)
Public Extension MethodUnion<TEntity>(IEnumerable<TEntity>, IEqualityComparer<TEntity>)Overloaded. Produces the set union of two sequences by using a specified IEqualityComparer<T>. (Defined by Enumerable.)
Public Extension MethodWhere<TEntity>(Func<TEntity, Boolean>)Overloaded. Filters a sequence of values based on a predicate. (Defined by Enumerable.)
Public Extension MethodWhere<TEntity>(Func<TEntity, 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 MethodZip<TEntity, TSecond, TResult>Applies a specified function to the corresponding elements of two sequences, producing a sequence of the results. (Defined by Enumerable.)
Top

  NameDescription
Explicit interface implemetationPrivate methodIEnumerable.GetEnumeratorReturns an enumerator that is used to iterate through the set of values cached by EntityCollection<TEntity>.
Explicit interface implemetationPrivate propertyIListSource.ContainsListCollectionGets a value that indicates whether the related entity collection consists of collection objects.
Explicit interface implemetationPrivate methodIListSource.GetListReturns the collection as an IList used for data binding.
Explicit interface implemetationPrivate methodIRelatedEnd.Add(IEntityWithRelationships)Adds an object to the related end. (Inherited from RelatedEnd.)
Explicit interface implemetationPrivate methodIRelatedEnd.Add(Object)Adds an object to the related end. (Inherited from RelatedEnd.)
Explicit interface implemetationPrivate methodIRelatedEnd.Attach(IEntityWithRelationships)Attaches an object at the related end. (Inherited from RelatedEnd.)
Explicit interface implemetationPrivate methodIRelatedEnd.Attach(Object)Attaches an object to the related end. (Inherited from RelatedEnd.)
Explicit interface implemetationPrivate methodIRelatedEnd.CreateSourceQueryReturns an IEnumerable that represents the objects that belong to the related end. (Inherited from RelatedEnd.)
Explicit interface implemetationPrivate methodIRelatedEnd.Remove(IEntityWithRelationships)Removes an object from the collection at the related end. (Inherited from RelatedEnd.)
Explicit interface implemetationPrivate methodIRelatedEnd.Remove(Object)Removes an object from the related end if the object is part of the related end. (Inherited from RelatedEnd.)
Top

An EntityCollection<TEntity> is a collection of objects of a particular entity type that represents the "many" end of a one-to-many or many-to-many relationship.

An EntityCollection<TEntity> is returned by a navigation property. Use the Load method to load related objects into an EntityCollection<TEntity>. To store an unrelated collection of objects of a specific entity type, such as the result of an ObjectQuery<T>, use an instance of the List<T> class.

An EntityCollection<TEntity> might have a corresponding EntityReference<TEntity>. When an EntityCollection<TEntity> and an EntityReference<TEntity> model opposite ends of the same relationship, the integrity of the relationship is maintained at the object level. The two classes are synchronized automatically.

This class cannot be inherited.

This example is based on the Adventure Works Sales Model. To run the code in this example, you must have already added the AdventureWorks Sales Model to your project and configured your project to use the Entity Framework. To do this, complete the procedures in How to: Manually Configure an Entity Framework Project and How to: Manually Define an E*ntity Data Model (Entity Framework).

This example does the following:

  1. Creates two new SalesOrderHeader entities and adds them to the Contact entity.

  2. Gets all related ends from the RelationshipManager that is associated with the Contact entity.

  3. Iterates through the collection of IRelatedEnds.

  4. Gets the EntityCollection<TEntity> for each related end.

  5. Uses the Remove method to remove one of the entities from the collection.

  6. Calls the Contains method to determine whether the object was removed from the collection.

  7. Uses the Add method to add the entity back.


using (AdventureWorksEntities context =
    new AdventureWorksEntities())
{
    Contact contact = new Contact();

    // Create a new SalesOrderHeader.
    SalesOrderHeader newSalesOrder1 = new SalesOrderHeader();
    // Add SalesOrderHeader to the Contact.
    contact.SalesOrderHeaders.Add(newSalesOrder1);

    // Create another SalesOrderHeader.
    SalesOrderHeader newSalesOrder2 = new SalesOrderHeader();
    // Add SalesOrderHeader to the Contact.
    contact.SalesOrderHeaders.Add(newSalesOrder2);

    // Get all related ends
    IEnumerable<IRelatedEnd> relEnds =
        ((IEntityWithRelationships)contact)
        .RelationshipManager.GetAllRelatedEnds();

    foreach (IRelatedEnd relEnd in relEnds)
    {
        // Get Entity Collection from related end
        EntityCollection<SalesOrderHeader> entityCollection =
            (EntityCollection<SalesOrderHeader>)relEnd;

        Console.WriteLine("EntityCollection count: {0}",
            entityCollection.Count);
        // Remove the first entity object.
        entityCollection.Remove(newSalesOrder1);

        bool contains = entityCollection.Contains(newSalesOrder1);

        // Write the number of items after one entity has been removed
        Console.WriteLine("EntityCollection count after one entity has been removed: {0}",
            entityCollection.Count);

        if (contains == false)
            Console.WriteLine("The removed entity is not in in the collection any more.");

        //Use IRelatedEnd to add the entity back.
        relEnd.Add(newSalesOrder1);
        Console.WriteLine("EntityCollection count after an entity has been added again: {0}",
            entityCollection.Count);
    }
}


.NET Framework

Supported in: 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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

Community Additions

ADD
Show:
© 2014 Microsoft