Enumerable.Sum Method (IEnumerable(Nullable(Single)))

Computes the sum of a sequence of nullable Single values.

Namespace:  System.Linq
Assemblies:   System.Linq (in System.Linq.dll)
  System.Core (in System.Core.dll)

static member Sum : 
        source:IEnumerable<Nullable<float32>> -> Nullable<float32> 

Parameters

source
Type: System.Collections.Generic.IEnumerable(Nullable(Single))

A sequence of nullable Single values to calculate the sum of.

Return Value

Type: System.Nullable(Single)
The sum of the values in the sequence.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(Nullable(Single)). 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).

ExceptionCondition
ArgumentNullException

source is a null reference (Nothing in Visual Basic).

This method returns zero if source contains no elements.

The result does not include values that are a null reference (Nothing in Visual Basic).

In Visual Basic query expression syntax, an Aggregate Into Sum() clause translates to an invocation of Sum.

The following code example demonstrates how to use Sum(IEnumerable(Nullable(Single))) to sum the values of a sequence.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8
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