Enumerable.Sum<'TSource> Method (IEnumerable<'TSource>, Func<'TSource, Double>)
.NET Framework (current version)
Computes the sum of the sequence of Double values that are obtained by invoking a transform function on each element of the input sequence.
Assembly: System.Core (in System.Core.dll)
static member Sum<'TSource> : source:IEnumerable<'TSource> * selector:Func<'TSource, float> -> float
Parameters
- source
-
Type:
System.Collections.Generic.IEnumerable<'TSource>
A sequence of values that are used to calculate a sum.
- selector
-
Type:
System.Func<'TSource, Double>
A transform function to apply to each element.
Type Parameters
- TSource
The type of the elements of source.
| Exception | Condition |
|---|---|
| ArgumentNullException | source or selector is null. |
This method returns zero if source contains no elements.
You can apply this method to a sequence of arbitrary values if you provide a function, selector, that projects the members of source into a numeric type, specifically Double.
In Visual Basic query expression syntax, an Aggregate Into Sum() clause translates to an invocation of Sum.
Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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