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Enumerable.Average Method (IEnumerable<Int64>)


Computes the average of a sequence of Int64 values.

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

public static double Average(
	this IEnumerable<long> source


Type: System.Collections.Generic.IEnumerable<Int64>

A sequence of Int64 values to calculate the average of.

Return Value

Type: System.Double

The average of the sequence of values.

Exception Condition

source is null.


source contains no elements.

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(IEnumerable<Int32>) to calculate an average.


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.

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

double average = grades.Average();

Console.WriteLine("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 7.0
Windows Phone
Available since 8.1
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