Qbservable.Sum Method (IQbservable<Nullable<Double>>)
Computes the sum of a sequence of nullable Double values.
Namespace: System.Reactive.Linq
Assembly: System.Reactive.Providers (in System.Reactive.Providers.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function Sum ( _
source As IQbservable(Of Nullable(Of Double)) _
) As IQbservable(Of Nullable(Of Double))
'Usage
Dim source As IQbservable(Of Nullable(Of Double))
Dim returnValue As IQbservable(Of Nullable(Of Double))
returnValue = source.Sum()
public static IQbservable<Nullable<double>> Sum(
this IQbservable<Nullable<double>> source
)
[ExtensionAttribute]
public:
static IQbservable<Nullable<double>>^ Sum(
IQbservable<Nullable<double>>^ source
)
static member Sum :
source:IQbservable<Nullable<float>> -> IQbservable<Nullable<float>>
public static function Sum(
source : IQbservable<Nullable<double>>
) : IQbservable<Nullable<double>>
Parameters
- source
Type: System.Reactive.Linq.IQbservable<Nullable<Double>>
A sequence of nullable Double values to calculate the sum of.
Return Value
Type: System.Reactive.Linq.IQbservable<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 IQbservable<Nullable<Double>>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .