ParallelEnumerable.Sum<TSource> Method (ParallelQuery<TSource>, Func<TSource, Nullable<Int64>>)
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.
Assembly: System.Core (in System.Core.dll)
public static Nullable<long> Sum<TSource>( this ParallelQuery<TSource> source, Func<TSource, Nullable<long>> selector )
The type of elements of source.
- Type: System.Linq.ParallelQuery<>
A sequence of values to calculate the sum of.
Usage NoteIn Visual Basic and C#, you can call this method as an instance method on any object of type ParallelQuery<>. 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).
The query was canceled with the token passed in through WithCancellation.
source or selector is a null reference (Nothing in Visual Basic).
The sum is larger than MaxValue. -or- 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.