ParallelEnumerable::Union<TSource> Method (ParallelQuery<TSource>^, IEnumerable<TSource>^)
This Union overload should never be called. This method is marked as obsolete and always throws NotSupportedException when called.
Assembly: System.Core (in System.Core.dll)
public: generic<typename TSource> [ExtensionAttribute] [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>.")] static ParallelQuery<TSource>^ Union( ParallelQuery<TSource>^ first, IEnumerable<TSource>^ second )
Parameters
- first
-
Type:
System.Linq::ParallelQuery<TSource>^
This parameter is not used.
- second
-
Type:
System.Collections.Generic::IEnumerable<TSource>^
This parameter is not used.
Return Value
Type: System.Linq::ParallelQuery<TSource>^This overload always throws a NotSupportedException.
Type Parameters
- TSource
This type parameter is not used.
| Exception | Condition |
|---|---|
| NotSupportedException | The exception that occurs when this method is called. |
| OperationCanceledException | The query was canceled with the token passed in through WithCancellation. |
| AggregateException | One or more exceptions occurred during the evaluation of the query. |
This overload exists to disallow usage of Union with a left data source of type ParallelQuery<TSource> and a right data source of type IEnumerable<T>. Otherwise, the Union operator would appear to be binding to the parallel implementation, but would in reality bind to sequential implementation.
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1