Qbservable.Aggregate(Of TSource, TAccumulate) Method (IQbservable(Of TSource), TAccumulate, Expression(Of Func(Of TAccumulate, TSource, TAccumulate)))

Applies an accumulator function over a queryable observable sequence.

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

<ExtensionAttribute> _
Public Shared Function Aggregate(Of TSource, TAccumulate) ( _
	source As IQbservable(Of TSource), _
	seed As TAccumulate, _
	accumulator As Expression(Of Func(Of TAccumulate, TSource, TAccumulate)) _
) As IQbservable(Of TAccumulate)
Dim source As IQbservable(Of TSource)
Dim seed As TAccumulate
Dim accumulator As Expression(Of Func(Of TAccumulate, TSource, TAccumulate))
Dim returnValue As IQbservable(Of TAccumulate)

returnValue = source.Aggregate(seed, _

Type Parameters


The type of source.


The type of accumulate.


Type: System.Reactive.Linq.IQbservable(Of TSource)
An observable sequence to aggregate over.
Type: TAccumulate
The initial accumulator value.
Type: System.Linq.Expressions.Expression(Of Func(Of TAccumulate, TSource, TAccumulate))
An accumulator function to be invoked on each element.

Return Value

Type: System.Reactive.Linq.IQbservable(Of TAccumulate)
A queryable observable sequence containing a single element with the final accumulator value.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQbservable(Of TSource). 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(v=vs.103).aspx or https://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.