Except(TSource) Method (ParallelQuery(TSource), ParallelQuery(TSource))

ParallelEnumerable.Except<TSource> Method (ParallelQuery<TSource>, ParallelQuery<TSource>)

Produces the set difference of two parallel sequences by using the default equality comparer to compare values.

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

public static ParallelQuery<TSource> Except<TSource>(
	this ParallelQuery<TSource> first,
	ParallelQuery<TSource> second

Type Parameters


The type of the elements of the input sequences.


Type: System.Linq.ParallelQuery<TSource>
A sequence whose elements that are not also in second will be returned.
Type: System.Linq.ParallelQuery<TSource>
A sequence whose elements that also occur in the first sequence will cause those elements to be removed from the returned sequence.

Return Value

Type: System.Linq.ParallelQuery<TSource>
A sequence that contains the set difference of the elements of two sequences.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).


first or second is a null reference (Nothing in Visual Basic).


The query was canceled with the token passed in through WithCancellation.


One or more exceptions occurred during the evaluation of the query.

.NET Framework

Supported in: 4

.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.

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