Observable.DistinctUntilChanged<TSource> Method (IObservable<TSource>, IEqualityComparer<TSource>)

Returns an observable sequence that contains only distinct contiguous elements according to the comparer.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function DistinctUntilChanged(Of TSource) ( _
    source As IObservable(Of TSource), _
    comparer As IEqualityComparer(Of TSource) _
) As IObservable(Of TSource)

'Usage
Dim source As IObservable(Of TSource)
Dim comparer As IEqualityComparer(Of TSource)
Dim returnValue As IObservable(Of TSource)

returnValue = source.DistinctUntilChanged(comparer)

public static IObservable<TSource> DistinctUntilChanged<TSource>(
    this IObservable<TSource> source,
    IEqualityComparer<TSource> comparer
)

[ExtensionAttribute]
public:
generic<typename TSource>
static IObservable<TSource>^ DistinctUntilChanged(
    IObservable<TSource>^ source, 
    IEqualityComparer<TSource>^ comparer
)

static member DistinctUntilChanged : 
        source:IObservable<'TSource> * 
        comparer:IEqualityComparer<'TSource> -> IObservable<'TSource> 

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 retain distinct contiguous elements for.

• comparer
  Type: System.Collections.Generic.IEqualityComparer<TSource>
  The equality comparer for computed key values.

Return Value

Type: System.IObservable<TSource>
An observable sequence only containing the distinct contiguous elements from the source sequence.

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

DistinctUntilChanged Overload

System.Reactive.Linq Namespace