ParallelEnumerable.ElementAtOrDefault<TSource> Method
.NET Framework 4
Returns the element at a specified index in a parallel sequence or a default value if the index is out of range.
Assembly: System.Core (in System.Core.dll)
public static TSource ElementAtOrDefault<TSource>( this ParallelQuery<TSource> source, int index )
Type Parameters
- TSource
The type of the elements of source.
Parameters
- source
- Type: System.Linq.ParallelQuery<TSource>
A sequence to return an element from.
- index
- Type: System.Int32
The zero-based index of the element to retrieve.
Return Value
Type: TSourcedefault(TSource) if the index is outside the bounds of the source sequence; otherwise, the element at the specified position in the source sequence.
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).| 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. |
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
