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

.NET Framework 4.5

Computes the sum of a sequence of Double values.

Namespace:  System.Linq
Assembly:  System.Core (in System.Core.dll)
```'Declaration
<ExtensionAttribute> _
Public Shared Function Sum ( _
source As IEnumerable(Of Double) _
) As Double
```

#### Parameters

source
Type: System.Collections.Generic.IEnumerable(Of Double)

A sequence of Double values to calculate the sum of.

#### 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. For more information, see Extension Methods (Visual Basic) or Extension Methods (C# Programming Guide).
ExceptionCondition
ArgumentNullException

source is Nothing.

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 Sum.

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.
MsgBox("The sum of the numbers is " & sum)

' This code produces the following output:
'
' The sum of the numbers is 635.13
```

#### .NET Framework

Supported in: 4.5.1, 4.5, 4, 3.5

#### .NET Framework Client Profile

Supported in: 4, 3.5 SP1

#### Portable Class Library

Supported in: Portable Class Library

#### .NET for Windows Store apps

Supported in: Windows 8

#### .NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone 8, Silverlight 8.1

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.