Observable.Sum Method (IObservable<Nullable<Double>>)

Computes the sum of a sequence of nullable Double values.

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

public static IObservable<Nullable<double>> Sum(
	this IObservable<Nullable<double>> source


Type: System.IObservable<Nullable<Double>>
A sequence of nullable Double values to calculate the sum of.

Return Value

Type: System.IObservable<Nullable<Double>>
The sum of a sequence of nullable Double values.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IObservable<Nullable<Double>>. When you use instance method syntax to call this method, omit the first parameter. For more information, see https://msdn.microsoft.com/en-us/library/bb384936.aspx or https://msdn.microsoft.com/en-us/library/bb383977.aspx.