public static AggregationView<Nullable<int>, Nullable<double>> LiveAverage(
	this View<Nullable<int>> source
)

<ExtensionAttribute> _
Public Shared Function LiveAverage ( _
	source As View(Of Nullable(Of Integer)) _
) As AggregationView(Of Nullable(Of Integer), Nullable(Of Double))

Return Value

If the source is empty or contains only nulls, the average value is null.

It is possible to use standard LINQ query operator Average instead of LiveAverage. Both are "live" in the sense that they are recomputed automatically when any change occurs in the source. The difference is that Average will every time loop through the entire source collection and aggregate it from scratch, whereas LiveAverage will use a more performant algorithm, will maintain its value incrementally, processing only those source items that actually changed.