Observable.Scan<TSource, TAccumulate> Method (IObservable<TSource>, TAccumulate, Func<TAccumulate, TSource, TAccumulate>)
Applies an accumulator function over an observable sequence and returns each intermediate result with the specified source, seed and accumulator.
Namespace: System.Reactive.Linq
Assembly: System.Reactive (in System.Reactive.dll)
Syntax
'Declaration
<ExtensionAttribute> _
Public Shared Function Scan(Of TSource, TAccumulate) ( _
source As IObservable(Of TSource), _
seed As TAccumulate, _
accumulator As Func(Of TAccumulate, TSource, TAccumulate) _
) As IObservable(Of TAccumulate)
'Usage
Dim source As IObservable(Of TSource)
Dim seed As TAccumulate
Dim accumulator As Func(Of TAccumulate, TSource, TAccumulate)
Dim returnValue As IObservable(Of TAccumulate)
returnValue = source.Scan(seed, accumulator)
public static IObservable<TAccumulate> Scan<TSource, TAccumulate>(
this IObservable<TSource> source,
TAccumulate seed,
Func<TAccumulate, TSource, TAccumulate> accumulator
)
[ExtensionAttribute]
public:
generic<typename TSource, typename TAccumulate>
static IObservable<TAccumulate>^ Scan(
IObservable<TSource>^ source,
TAccumulate seed,
Func<TAccumulate, TSource, TAccumulate>^ accumulator
)
static member Scan :
source:IObservable<'TSource> *
seed:'TAccumulate *
accumulator:Func<'TAccumulate, 'TSource, 'TAccumulate> -> IObservable<'TAccumulate>
JScript does not support generic types and methods.
Type Parameters
- TSource
The type of source.
- TAccumulate
The type of accumulator.
Parameters
- source
Type: System.IObservable<TSource>
An observable sequence to accumulate over.
- seed
Type: TAccumulate
The initial accumulator value.
- accumulator
Type: System.Func<TAccumulate, TSource, TAccumulate>
An accumulator function to be invoked on each element.
Return Value
Type: System.IObservable<TAccumulate>
An observable sequence containing the accumulated values.
Usage Note
In Visual Basic and C#, you can call this method as an instance method on any object of type IObservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .