Observable.Contains(Of TSource) Method (IObservable(Of TSource), TSource, IEqualityComparer(Of 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)

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

Type Parameters


The type of source.


Type: System.IObservable(Of TSource)
An observable sequence in which to locate a value.
Type: TSource
The value to locate a sequence.
Type: System.Collections.Generic.IEqualityComparer(Of TSource)
An equality comparer to compare values.

Return Value

Type: System.IObservable(Of Boolean)
True if an observable sequence contains a specified element by using a specified System.Collections.Generic.IEqualityComparer&lt;T&gt; otherwise, false.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IObservable(Of TSource). When you use instance method syntax to call this method, omit the first parameter. For more information, see https://msdn.microsoft.com/en-us/library/bb384936(v=vs.103).aspx or https://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.