Enumerable.Average Method (IEnumerable<Int32>)

May 11, 2014

Computes the average of a sequence of Int32 values.

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

public static double Average(
	this IEnumerable<int> source
)

Parameters

source
Type: System.Collections.Generic.IEnumerable<Int32>
A sequence of Int32 values to calculate the average of.

Return Value

Type: System.Double
The average of the sequence of values.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IEnumerable<Int32>. When you use instance method syntax to call this method, omit the first parameter.

ExceptionCondition
ArgumentNullException

source is null.

InvalidOperationException

source contains no elements.

In Visual Basic query expression syntax, an Aggregate Into Average() clause translates to an invocation ofEnumerable.Average.

The following code example demonstrates how to use Average(IEnumerable<Int32>) to calculate an average.


      List<int> grades = new List<int> { 78, 92, 100, 37, 81 };

      double average = grades.Average();

      outputBlock.Text += String.Format("The average grade is {0}.", average) + "\n";

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



Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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