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ParallelEnumerable.Union(TSource) Method (ParallelQuery(TSource), ParallelQuery(TSource), IEqualityComparer(TSource))

Produces the set union of two parallel sequences by using a specified IEqualityComparer{T}.

Namespace:  System.Linq
Assemblies:   System.Linq.Parallel (in System.Linq.Parallel.dll)
  System.Core (in System.Core.dll)

static member Union : 
        first:ParallelQuery<'TSource> * 
        second:ParallelQuery<'TSource> * 
        comparer:IEqualityComparer<'TSource> -> ParallelQuery<'TSource> 

Type Parameters


The type of the elements of the input sequences.


Type: System.Linq.ParallelQuery(TSource)

A sequence whose distinct elements form the first set for the union.

Type: System.Linq.ParallelQuery(TSource)

A sequence whose distinct elements form the second set for the union.

Type: System.Collections.Generic.IEqualityComparer(TSource)

An IEqualityComparer(T) to compare values.

Return Value

Type: System.Linq.ParallelQuery(TSource)
A sequence that contains the elements from both input sequences, excluding duplicates.

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: 4.6, 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

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.

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