Observable.Contains<TSource> Method (IObservable<TSource>, TSource, IEqualityComparer<TSource>)
Determines whether an observable sequence contains a specified element by using a specified System.Collections.Generic.IEqualityComparer<T>.
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, _
comparer As IEqualityComparer(Of TSource) _
) As IObservable(Of Boolean)
'Usage
Dim source As IObservable(Of TSource)
Dim value As TSource
Dim comparer As IEqualityComparer(Of TSource)
Dim returnValue As IObservable(Of Boolean)
returnValue = source.Contains(value, _
comparer)
public static IObservable<bool> Contains<TSource>(
this IObservable<TSource> source,
TSource value,
IEqualityComparer<TSource> comparer
)
[ExtensionAttribute]
public:
generic<typename TSource>
static IObservable<bool>^ Contains(
IObservable<TSource>^ source,
TSource value,
IEqualityComparer<TSource>^ comparer
)
static member Contains :
source:IObservable<'TSource> *
value:'TSource *
comparer:IEqualityComparer<'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.
- comparer
Type: System.Collections.Generic.IEqualityComparer<TSource>
An equality comparer to compare values.
Return Value
Type: System.IObservable<Boolean>
True if an observable sequence contains a specified element by using a specified System.Collections.Generic.IEqualityComparer<T> 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 .