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Qbservable.Sum Method (IQbservable(Of Nullable(Of Int64)))

Computes the sum of a sequence of nullable Int64 values.

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

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

returnValue = source.Sum()

Parameters

source: Type: System.Reactive.Linq.IQbservable(Of Nullable(Of Int64))
A sequence of nullable Int64 values to calculate the sum of.

Return Value

Type: System.Reactive.Linq.IQbservable(Of Nullable(Of Int64))
The sum of a sequence of nullable Int64 values.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQbservable(Of Nullable(Of Int64)). When you use instance method syntax to call this method, omit the first parameter. For more information, see http://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or http://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.

Reference

Qbservable Class

Sum Overload

System.Reactive.Linq Namespace

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