Qbservable.Scan<TSource, TAccumulate> Method (IQbservable<TSource>, TAccumulate, Expression<Func<TAccumulate, TSource, TAccumulate>>)

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

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

public static IQbservable<TAccumulate> Scan<TSource, TAccumulate>(
	this IQbservable<TSource> source,
	TAccumulate seed,
	Expression<Func<TAccumulate, TSource, TAccumulate>> accumulator

Type Parameters


The type of source.


The type of accumulator.


Type: System.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence to accumulate over.
Type: TAccumulate
The initial accumulator value.
Type: System.Linq.Expressions.Expression<Func<TAccumulate, TSource, TAccumulate>>
An accumulator function to be invoked on each element.

Return Value

Type: System.Reactive.Linq.IQbservable<TAccumulate>
A queryable 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 IQbservable<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.