Queryable.Average Method (IQueryable(Of Decimal))


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Computes the average of a sequence of Decimal values.

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

Public Shared Function Average (
	source As IQueryable(Of Decimal)
) As Decimal


Type: System.Linq.IQueryable(Of Decimal)

A sequence of Decimal values to calculate the average of.

Return Value

Type: System.Decimal

The average of the sequence of values.

Exception Condition

source is null.


source contains no elements.

The Average(IQueryable(Of Decimal)) method generates a MethodCallExpression that represents calling Average(IQueryable(Of Decimal)) itself. It then passes the MethodCallExpression to the Execute(Of 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 Average(IQueryable(Of Decimal)) depends on the implementation of the type of the source parameter. The expected behavior is that it calculates the average of the values in source.

The following code example demonstrates how to use Average(IQueryable(Of Int32)) to calculate the average of a sequence of values.


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.

Dim grades As New List(Of Integer)(New Integer() {78, 92, 100, 37, 81})

Dim average As Double = grades.AsQueryable().Average()

MsgBox(String.Format("The average grade is {0}.", average))

' This code produces the following output:
' The average grade is 77.6. 

Universal Windows Platform
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.1
Windows Phone
Available since 8.1
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