Single(TSource) Method (IObservable(TSource))
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Observable.Single(TSource) Method (IObservable(TSource))

Returns the only element of an observable sequence and throws an exception if there is not exactly one element in the observable sequence.

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

static member Single : 
        source:IObservable<'TSource> -> 'TSource 

Type Parameters

TSource

The type of source.

Parameters

source
Type: System.IObservable(TSource)
The source observable sequence.

Return Value

Type: TSource
The single element in the observable sequence.

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.aspx or https://msdn.microsoft.com/en-us/library/bb383977.aspx.
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