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ObservableEx.Let(IObservable, Func, IObservable>) method¶

Defined in

Type: ObservableEx Namespace: System.Reactive.Linq Assembly: System.Reactive.dll

Applies to

netstandard2.0

Attributes: [Experimental]

public static IObservable<TResult> Let<TSource, TResult>(this IObservable<TSource> source, Func<IObservable<TSource>, IObservable<TResult>> selector)

Summary: Returns an observable sequence that is the result of invoking the selector on the source sequence, without sharing subscriptions. This operator allows for a fluent style of writing queries that use the same sequence multiple times.

Type parameters

Name	Description
`TSource`	The type of the elements in the source sequence.
`TResult`	The type of the elements in the result sequence.

Parameters

Name	Type	Description
`source`	IObservable	Source sequence that will be shared in the selector function.
`selector`	Func, IObservable>	Selector function which can use the source sequence as many times as needed, without sharing subscriptions to the source sequence.

Returns: IObservable -- An observable sequence that contains the elements of a sequence produced by multicasting the source sequence within a selector function.

Exceptions

Type	Condition
System.ArgumentNullException	`source` or `selector` is null.