ParallelEnumerable.Aggregate(Of TSource, TAccumulate, TResult) Method (ParallelQuery(Of TSource), TAccumulate, Func(Of TAccumulate, TSource, TAccumulate), Func(Of TAccumulate, TResult))
Applies in parallel an accumulator function over a sequence. The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.
Assembly: System.Core (in System.Core.dll)
<ExtensionAttribute> Public Shared Function Aggregate(Of TSource, TAccumulate, TResult) ( source As ParallelQuery(Of TSource), seed As TAccumulate, func As Func(Of TAccumulate, TSource, TAccumulate), resultSelector As Func(Of TAccumulate, TResult) ) As TResult
Parameters
- source
-
Type:
System.Linq.ParallelQuery(Of TSource)
A sequence to aggregate over.
- seed
-
Type:
TAccumulate
The initial accumulator value.
- func
-
Type:
System.Func(Of TAccumulate, TSource, TAccumulate)
An accumulator function to be invoked on each element.
- resultSelector
-
Type:
System.Func(Of TAccumulate, TResult)
A function to transform the final accumulator value into the result value.
Return Value
Type: TResultThe transformed final accumulator value.
Type Parameters
- TSource
The type of the elements of source.
- TAccumulate
The type of the accumulator value.
- TResult
The type of the resulting value.
| Exception | Condition |
|---|---|
| OperationCanceledException | The query was canceled with the token passed in through WithCancellation. |
| ArgumentNullException | source or func or resultSelector is a null reference (Nothing in Visual Basic). |
| AggregateException | One or more exceptions occurred during the evaluation of the query. |
| InvalidOperationException | source contains no elements. |
Available since 8
.NET Framework
Available since 4.0
Portable Class Library
Supported in: portable .NET platforms
Windows Phone
Available since 8.1