ParallelEnumerable.Select(Of TSource, TResult) Method (ParallelQuery(Of TSource), Func(Of TSource, Int32, TResult))
Projects in parallel each element of a sequence into a new form by incorporating the element's index.
Assembly: System.Core (in System.Core.dll)
<ExtensionAttribute> Public Shared Function Select(Of TSource, TResult) ( source As ParallelQuery(Of TSource), selector As Func(Of TSource, Integer, TResult) ) As ParallelQuery(Of TResult)
Parameters
- source
-
Type:
System.Linq.ParallelQuery(Of TSource)
A sequence of values to invoke a transform function on.
- selector
-
Type:
System.Func(Of TSource, Int32, TResult)
A transform function to apply to each element.
Return Value
Type: System.Linq.ParallelQuery(Of TResult)A sequence whose elements are the result of invoking the transform function on each element of source, based on the index supplied to selector.
Type Parameters
- TSource
The type of the elements of source.
- TResult
The type of elements resturned by selector.
| Exception | Condition |
|---|---|
| ArgumentNullException | source or selector 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. |
| OverflowException | More than MaxValue elements are enumerated by the query. This condition might occur in streaming scenarios. |
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1