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

Returns last element in the observable sequence, or a default value if no value is found.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function LastOrDefault(Of TSource) ( _
    source As IObservable(Of TSource) _
) As TSource
'Usage
Dim source As IObservable(Of TSource)
Dim returnValue As TSource

returnValue = source.LastOrDefault()
public static TSource LastOrDefault<TSource>(
    this IObservable<TSource> source
)
[ExtensionAttribute]
public:
generic<typename TSource>
static TSource LastOrDefault(
    IObservable<TSource>^ source
)
static member LastOrDefault : 
        source:IObservable<'TSource> -> 'TSource 
JScript does not support generic types and methods.

Type Parameters

  • TSource
    The type of source.

Parameters

Return Value

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

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 or .

See Also

Reference

Observable Class

LastOrDefault Overload

System.Reactive.Linq Namespace