ParallelEnumerable.SingleOrDefault(Of TSource) Method (ParallelQuery(Of TSource))
.NET Framework (current version)
Returns the only element of a parallel sequence, or a default value if the sequence is empty; this method throws an exception if there is more than one element in the sequence.
Assembly: System.Core (in System.Core.dll)
<ExtensionAttribute> Public Shared Function SingleOrDefault(Of TSource) ( source As ParallelQuery(Of TSource) ) As TSource
Parameters
- source
-
Type:
System.Linq.ParallelQuery(Of TSource)
The sequence to return the single element of.
Return Value
Type: TSourceThe single element of the input sequence, or default() if the sequence contains no elements.
Type Parameters
- TSource
The type of the elements of source.
| Exception | Condition |
|---|---|
| OperationCanceledException | The query was canceled with the token passed in through WithCancellation. |
| ArgumentNullException | source is a null reference (Nothing in Visual Basic). |
| AggregateException | One or more exceptions occurred during the evaluation of the query. |
Universal Windows Platform
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1
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