Share via


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)

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function Sum ( _
    source As IObservable(Of Nullable(Of Double)) _
) As IObservable(Of Nullable(Of Double))
'Usage
Dim source As IObservable(Of Nullable(Of Double))
Dim returnValue As IObservable(Of Nullable(Of Double))

returnValue = source.Sum()
public static IObservable<Nullable<double>> Sum(
    this IObservable<Nullable<double>> source
)
[ExtensionAttribute]
public:
static IObservable<Nullable<double>>^ Sum(
    IObservable<Nullable<double>>^ source
)
static member Sum : 
        source:IObservable<Nullable<float>> -> IObservable<Nullable<float>> 
public static function Sum(
    source : IObservable<Nullable<double>>
) : IObservable<Nullable<double>>

Parameters

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 or .

See Also

Reference

Observable Class

Sum Overload

System.Reactive.Linq Namespace