Enumerable.Average Method (IEnumerable(Of Nullable(Of Int32)))
[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]
Computes the average of a sequence of nullable Int32 values.
Assembly: System.Core (in System.Core.dll)
'Declaration <ExtensionAttribute> _ Public Shared Function Average ( _ source As IEnumerable(Of Nullable(Of Integer)) _ ) As Nullable(Of Double)
Parameters
- source
- Type: System.Collections.Generic.IEnumerable(Of Nullable(Of Int32))
A sequence of nullable Int32values to calculate the average of.
Return Value
Type: System.Nullable(Of Double)The average of the sequence of values, or Nothing if the source sequence is empty or contains only values that are Nothing.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable(Of Nullable(Of Int32)). When you use instance method syntax to call this method, omit the first parameter.| Exception | Condition |
|---|---|
| ArgumentNullException | source is Nothing. |
| OverflowException | The sum of the elements in the sequence is larger than MaxValue. |
The following code example demonstrates how to use Average(IEnumerable(Of Nullable(Of Int64))) to calculate an average.
Note: |
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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 an array of nullable long values.
Dim longs() As Nullable(Of Long) = {Nothing, 10007L, 37L, 399846234235L}
' Determine the average value in the array.
Dim avg As Nullable(Of Double) = longs.Average()
' Display the output.
outputBlock.Text &= "The average is " & avg.ToString & vbCrLf
' This code produces the following output:
'
' The average is 133282081426.333
Note: