Enumerable::Sum<TSource> Method (IEnumerable<TSource>, Func<TSource, Double>)
Silverlight
Computes the sum of the sequence of Double 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)
Type Parameters
- TSource
The type of the elements of source.
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.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<TSource>. When you use instance method syntax to call this method, omit the first parameter.| Exception | Condition |
|---|---|
| ArgumentNullException | source or selector is nullptr. |
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.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
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