Union(TSource) Method (ParallelQuery(TSource), IEnumerable(TSource), IEqualityComparer(TSource))

Task Parallel System.Threading

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This Union overload should never be called. This method is marked as obsolete and always throws NotSupportedException when called.

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

Syntax

Visual Basic (Declaration)
<ObsoleteAttribute("The second data source of a binary operator must be of type System.Linq.ParallelQuery<T> rather than System.Collections.Generic.IEnumerable<T>. To fix this problem, use the AsParallel() extension method to convert the right data source to System.Linq.ParallelQuery<T>.")> _ Public Shared Function Union(Of TSource) ( _ first As ParallelQuery(Of TSource), _ second As IEnumerable(Of TSource), _ comparer As IEqualityComparer(Of TSource) _ ) As ParallelQuery(Of TSource)

Visual Basic (Declaration)

<ObsoleteAttribute("The second data source of a binary operator must be of type System.Linq.ParallelQuery<T> rather than System.Collections.Generic.IEnumerable<T>. To fix this problem, use the AsParallel() extension method to convert the right data source to System.Linq.ParallelQuery<T>.")> _
Public Shared Function Union(Of TSource) ( _
	first As ParallelQuery(Of TSource), _
	second As IEnumerable(Of TSource), _
	comparer As IEqualityComparer(Of TSource) _
) As ParallelQuery(Of TSource)

C#
[ObsoleteAttribute("The second data source of a binary operator must be of type System.Linq.ParallelQuery<T> rather than System.Collections.Generic.IEnumerable<T>. To fix this problem, use the AsParallel() extension method to convert the right data source to System.Linq.ParallelQuery<T>.")] public static ParallelQuery<TSource> Union<TSource>( ParallelQuery<TSource> first, IEnumerable<TSource> second, IEqualityComparer<TSource> comparer )

[ObsoleteAttribute("The second data source of a binary operator must be of type System.Linq.ParallelQuery<T> rather than System.Collections.Generic.IEnumerable<T>. To fix this problem, use the AsParallel() extension method to convert the right data source to System.Linq.ParallelQuery<T>.")]
public static ParallelQuery<TSource> Union<TSource>(
	ParallelQuery<TSource> first,
	IEnumerable<TSource> second,
	IEqualityComparer<TSource> comparer
)

Parameters

first: Type: System.Linq..::.ParallelQuery<(Of <(TSource>)>)
This parameter is not used.

second: Type: System.Collections.Generic..::.IEnumerable<(Of <(TSource>)>)
This parameter is not used.

comparer: Type: System.Collections.Generic..::.IEqualityComparer<(Of <(TSource>)>)
This parameter is not used.

Type Parameters

TSource: This type parameter is not used.

Return Value

This overload always throws a NotSupportedException.

Remarks

This overload exists to disallow usage of Union with a left data source of type ParallelQuery<(Of <(TSource>)>) and a right data source of type IEnumerable<(Of <(T>)>). Otherwise, the Union operator would appear to be binding to the parallel implementation, but would in reality bind to the sequential implementation.

Exceptions

Exception	Condition
System..::.NotSupportedException	The exception that occurs when this method is called.