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Observable.Scan<TSource> Method (IObservable<TSource>, Func<TSource, TSource, TSource>)

Applies an accumulator function over an observable sequence and returns each intermediate result with the specified source and accumulator.

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

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

Type Parameters

TSource

The type of source.

Parameters

source
Type: System.IObservable<TSource>
An observable sequence to accumulate over.
accumulator
Type: System.Func<TSource, TSource, TSource>
An accumulator function to be invoked on each element.

Return Value

Type: System.IObservable<TSource>
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.
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