Enumerable.Average(Of TSource) Method (IEnumerable(Of TSource), Func(Of TSource, Decimal))
Computes the average of a sequence of Decimal values that are obtained by invoking a transform function on each element of the input sequence.
Assembly: System.Core (in System.Core.dll)
<ExtensionAttribute> Public Shared Function Average(Of TSource) ( source As IEnumerable(Of TSource), selector As Func(Of TSource, Decimal) ) As Decimal
Parameters
- source
-
Type:
System.Collections.Generic.IEnumerable(Of TSource)
A sequence of values that are used to calculate an average.
- selector
-
Type:
System.Func(Of TSource, Decimal)
A transform function to apply to each element.
Type Parameters
- TSource
The type of the elements of source.
| Exception | Condition |
|---|---|
| ArgumentNullException | source or selector is null. |
| InvalidOperationException | source contains no elements. |
| OverflowException | The sum of the elements in the sequence is larger than MaxValue. |
In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation of Average.
The following code example demonstrates how to use Average(Of TSource)(IEnumerable(Of TSource), Func(Of TSource, Int64)) to calculate an average.
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, change the body of the selector function. |
' Create an array of strings. Dim numbers() As String = {"10007", "37", "299846234235"} ' Determine the average number after converting each ' string to an Int64 value. Dim avg As Double = numbers.Average(Function(number) Convert.ToInt64(number)) ' Display the output. MsgBox("The average is " & avg) ' This code produces the following output: ' ' The average is 99948748093
Available since 8
.NET Framework
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
.jpeg?cs-save-lang=1&cs-lang=vb)