Observable.Contains<TSource> Method (IObservable<TSource>, TSource)

Determines whether an observable sequence contains a specified element by using the default equality comparer.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function Contains(Of TSource) ( _
    source As IObservable(Of TSource), _
    value As TSource _
) As IObservable(Of Boolean)

'Usage
Dim source As IObservable(Of TSource)
Dim value As TSource
Dim returnValue As IObservable(Of Boolean)

returnValue = source.Contains(value)

public static IObservable<bool> Contains<TSource>(
    this IObservable<TSource> source,
    TSource value
)

[ExtensionAttribute]
public:
generic<typename TSource>
static IObservable<bool>^ Contains(
    IObservable<TSource>^ source, 
    TSource value
)

static member Contains : 
        source:IObservable<'TSource> * 
        value:'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 in which to locate a value.

• value
  Type: TSource
  The value to locate a sequence.

Return Value

Type: System.IObservable<Boolean>
True if an observable sequence contains a specified element by using the default equality comparer; 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

Contains Overload

System.Reactive.Linq Namespace