# Enumerable.Sum Method (IEnumerable<(Of <(Double>)>))

Computes the sum of a sequence of Double values.

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

## Syntax

``````<ExtensionAttribute> _
Public Shared Function Sum ( _
source As IEnumerable(Of Double) _
) As Double
``````
``````public static double Sum(
this IEnumerable<double> source
)
``````

#### Return Value

Type: System..::.Double
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<(Of <(Double>)>). When you use instance method syntax to call this method, omit the first parameter.

## Exceptions

Exception Condition
ArgumentNullException

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

## Remarks

This method returns zero if source contains no elements.

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

## Examples

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

Note

This code example uses an overload of this overloaded method that is different from the specific overload that this topic describes. To extend the example to this topic, substitute the elements of the source sequence with elements of the appropriate numerical type.

``````      ' Create a list of Single values.
Dim numbers As New List(Of Single)(New Single() _
{43.68F, 1.25F, 583.7F, 6.5F})

' Get the sum of values in the list.
Dim sum As Single = numbers.Sum()

' Display the output.
outputBlock.Text &= "The sum of the numbers is " & sum & vbCrLf

' This code produces the following output:
'
' The sum of the numbers is 635.13
``````
``````      List<float> numbers = new List<float> { 43.68F, 1.25F, 583.7F, 6.5F };

float sum = numbers.Sum();

outputBlock.Text += String.Format("The sum of the numbers is {0}.", sum) + "\n";

/*
This code produces the following output:

The sum of the numbers is 635.13.
*/
``````

## Version Information

#### Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone