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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

C++

JScript

public static IObservable<TAccumulate> Scan<TSource, TAccumulate>(
	this IObservable<TSource> source,
	TAccumulate seed,
	Func<TAccumulate, TSource, TAccumulate> accumulator
)

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 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

Observable Class

Scan Overload

System.Reactive.Linq Namespace

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