Queryable.Sum Method (IQueryable<Single>)
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Computes the sum of a sequence of Single values.
Namespace: System.Linq
Assembly: System.Core (in System.Core.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function Sum ( _
source As IQueryable(Of Single) _
) As Single
public static float Sum(
this IQueryable<float> source
)
Parameters
- source
Type: System.Linq.IQueryable<Single>
A sequence of Single values to calculate the sum of.
Return Value
Type: System.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 IQueryable<Single>. When you use instance method syntax to call this method, omit the first parameter.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | source is nulla null reference (Nothing in Visual Basic). |
Remarks
The Sum(IQueryable<Single>) method generates a MethodCallExpression that represents calling Sum(IQueryable<Single>) itself as a constructed generic method. It then passes the MethodCallExpression to the Execute<TResult>(Expression) method of the IQueryProvider represented by the Provider property of the source parameter.
The query behavior that occurs as a result of executing an expression tree that represents calling Sum(IQueryable<Single>) depends on the implementation of the type of the source parameter. The expected behavior is that it returns the sum of the values in source.
Examples
The following code example demonstrates how to use Sum(IQueryable<Single>) to sum the values of a sequence.
Dim numbers As New List(Of Single)(New Single() {43.68F, 1.25F, 583.7F, 6.5F})
Dim sum As Single = numbers.AsQueryable().Sum()
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.AsQueryable().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
Silverlight
Supported in: 5, 4, 3
Silverlight for Windows Phone
Supported in: Windows Phone OS 7.1
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.