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MSDN Library

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

Produces the set union of two parallel sequences by using the default equality comparer.

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

'Declaration
<ExtensionAttribute> _
Public Shared Function Union(Of TSource) ( _
	first As ParallelQuery(Of TSource), _
	second As ParallelQuery(Of TSource) _
) As ParallelQuery(Of TSource)

Type Parameters

TSource

The type of the elements of the input sequences.

Parameters

first
Type: System.Linq.ParallelQuery(Of TSource)

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

second
Type: System.Linq.ParallelQuery(Of TSource)

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

Return Value

Type: System.Linq.ParallelQuery(Of 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(Of 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).

ExceptionCondition
ArgumentNullException

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

OperationCanceledException

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

AggregateException

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

.NET for Windows Phone apps

Supported in: Windows Phone 8.1

Portable Class Library

Supported in: Portable Class Library
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