Observable

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

Determines whether an observable sequence contains any elements.

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

Syntax

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

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

Type Parameters

  • TSource
    The type of source.

Parameters

  • source
    Type: System.IObservable<TSource>
    An observable sequence to check for non-emptiness.

Return Value

Type: System.IObservable<Boolean>
True if an observable sequence contains any elements; otherwise, false.

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

Any Overload

System.Reactive.Linq Namespace

Observable.Any<TSource> Method (IObservable<TSource>, Func<TSource, Boolean>)

Determines whether all elements of an observable sequence satisfies a condition.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function Any(Of TSource) ( _
    source As IObservable(Of TSource), _
    predicate As Func(Of TSource, Boolean) _
) As IObservable(Of Boolean)
'Usage
Dim source As IObservable(Of TSource)
Dim predicate As Func(Of TSource, Boolean)
Dim returnValue As IObservable(Of Boolean)

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

Type Parameters

  • TSource
    The type of source.

Parameters

  • source
    Type: System.IObservable<TSource>
    An observable sequence whose elements to apply the predicate to.

  • predicate
    Type: System.Func<TSource, Boolean>
    A function to test each element for a condition.

Return Value

Type: System.IObservable<Boolean>
True if all elements of an observable sequence satisfies a condition; otherwise, false.

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

Any Overload

System.Reactive.Linq Namespace