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Observable.DefaultIfEmpty<TSource> Method (IObservable<TSource>)

Returns the elements of the specified sequence or the type parameter's default value in a singleton sequence if the sequence is empty.

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

public static IObservable<TSource> DefaultIfEmpty<TSource>(
	this IObservable<TSource> source
)

Type Parameters

TSource

The type of source.

Parameters

source
Type: System.IObservable<TSource>
The sequence to return a default value for if it is empty.

Return Value

Type: System.IObservable<TSource>
An observable sequence that contains the default value for the TSource type if the source is empty; otherwise, the elements of the source itself.

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