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Queryable.Except<TSource> Method (IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>)

 

Produces the set difference of two sequences by using the specified IEqualityComparer<T> to compare values.

Namespace:   System.Linq
Assembly:  System.Core (in System.Core.dll)

public static IQueryable<TSource> Except<TSource>(
	this IQueryable<TSource> source1,
	IEnumerable<TSource> source2,
	IEqualityComparer<TSource> comparer
)

Parameters

source1
Type: System.Linq.IQueryable<TSource>

An IQueryable<T> whose elements that are not also in source2 will be returned.

source2
Type: System.Collections.Generic.IEnumerable<TSource>

An IEnumerable<T> whose elements that also occur in the first sequence will not appear in the returned sequence.

comparer
Type: System.Collections.Generic.IEqualityComparer<TSource>

An IEqualityComparer<T> to compare values.

Return Value

Type: System.Linq.IQueryable<TSource>

An IQueryable<T> that contains the set difference of the two sequences.

Type Parameters

TSource

The type of the elements of the input sequences.

Exception Condition
ArgumentNullException

source1 or source2 is null.

The Except<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) method generates a MethodCallExpression that represents calling Except<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) itself as a constructed generic method. It then passes the MethodCallExpression to the CreateQuery<TElement>(Expression) method of the IQueryProvider represented by the Provider property of thesource1 parameter.

The query behavior that occurs as a result of executing an expression tree that represents calling Except<TSource>(IQueryable<TSource>, IEnumerable<TSource>, IEqualityComparer<TSource>) depends on the implementation of the type of the source1 parameter. The expected behavior is that all the elements in source1 are returned except for those that are also in source2, and comparer is used to compare values.

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.1
Windows Phone
Available since 8.1
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