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Observable::FirstOrDefault<TSource> Method (IObservable<TSource>)

Returns the first element of an observable sequence, or a default value if no value is found.

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

[ExtensionAttribute]
public:
generic<typename TSource>
static TSource FirstOrDefault(
	IObservable<TSource>^ source
)

Type: TSource
The first element in the observable sequence, or a default value if no value is found.

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(v=vs.103).aspx or http://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.

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