ParallelEnumerable.Sum<TSource> Method (ParallelQuery<TSource>, Func<TSource, Nullable<Decimal>>)
Computes in parallel the sum of the sequence of values that are obtained by invoking a transform function on each element of the input sequence.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
public static Nullable<decimal> Sum<TSource>( this ParallelQuery<TSource> source, Func<TSource, Nullable<decimal>> selector )
Type Parameters
- TSource
The type of elements of source.
Parameters
- source
- Type: System.Linq.ParallelQuery<TSource>
A sequence of values to calculate the sum of.
- selector
- Type: System.Func<TSource, Nullable<Decimal>>
A transform function to apply to each element.
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 or selector is a null reference (Nothing in Visual Basic). |
| AggregateException | The sum is larger than MaxValue. -or- One or more exceptions occurred during the evaluation of the query. |
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
