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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)

[ExtensionAttribute]
public:
generic<typename TSource, typename TAccumulate>
static IObservable<TAccumulate>^ Scan(
	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 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.
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