Enumerable.Average<TSource> Method (IEnumerable<TSource>, Func<TSource, Nullable<Double>>)
Computes the average of a sequence of nullable Double values that are obtained by invoking a transform function on each element of the input sequence.
Assembly: System.Core (in System.Core.dll)
public static Nullable<double> Average<TSource>( this IEnumerable<TSource> source, Func<TSource, Nullable<double>> selector )
A sequence of values to calculate the average of.
Return ValueType: System.Nullable<Double>
The average of the sequence of values, or null if the source sequence is empty or contains only values that are null.
The type of the elements of source.
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<TSource>(IEnumerable<TSource>, Func<TSource, Int64>) 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, change the body of the selector function.
Available since 4.5
Available since 3.5
Portable Class Library
Supported in: portable .NET platforms
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Available since 8.1