ParallelEnumerable::Sum<TSource> Method (ParallelQuery<TSource>, Func<TSource, Nullable<Double>>)
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.
Assemblies: System.Linq.Parallel (in System.Linq.Parallel.dll)
System.Core (in System.Core.dll)
[ExtensionAttribute] public: generic<typename TSource> static Nullable<double> Sum( ParallelQuery<TSource>^ source, Func<TSource, Nullable<double>>^ 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.