Qbservable

Qbservable.DistinctUntilChanged<TSource, TKey> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>)

Returns a queryable observable sequence that contains only distinct contiguous elements according to the keySelector.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function DistinctUntilChanged(Of TSource, TKey) ( _
    source As IQbservable(Of TSource), _
    keySelector As Expression(Of Func(Of TSource, TKey)) _
) As IQbservable(Of TSource)
'Usage
Dim source As IQbservable(Of TSource)
Dim keySelector As Expression(Of Func(Of TSource, TKey))
Dim returnValue As IQbservable(Of TSource)

returnValue = source.DistinctUntilChanged(keySelector)
public static IQbservable<TSource> DistinctUntilChanged<TSource, TKey>(
    this IQbservable<TSource> source,
    Expression<Func<TSource, TKey>> keySelector
)
[ExtensionAttribute]
public:
generic<typename TSource, typename TKey>
static IQbservable<TSource>^ DistinctUntilChanged(
    IQbservable<TSource>^ source, 
    Expression<Func<TSource, TKey>^>^ keySelector
)
static member DistinctUntilChanged : 
        source:IQbservable<'TSource> * 
        keySelector:Expression<Func<'TSource, 'TKey>> -> IQbservable<'TSource> 
JScript does not support generic types and methods.

Type Parameters

  • TSource
    The type of source.

  • TKey
    The type of key.

Parameters

Return Value

Type: System.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence only containing the distinct contiguous elements, based on a computed key value 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 IQbservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .

See Also

Reference

Qbservable Class

DistinctUntilChanged Overload

System.Reactive.Linq Namespace

Qbservable.DistinctUntilChanged<TSource, TKey> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>, IEqualityComparer<TKey>)

Returns a queryable observable sequence that contains only distinct contiguous elements according to the keySelector and the comparer.

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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function DistinctUntilChanged(Of TSource, TKey) ( _
    source As IQbservable(Of TSource), _
    keySelector As Expression(Of Func(Of TSource, TKey)), _
    comparer As IEqualityComparer(Of TKey) _
) As IQbservable(Of TSource)
'Usage
Dim source As IQbservable(Of TSource)
Dim keySelector As Expression(Of Func(Of TSource, TKey))
Dim comparer As IEqualityComparer(Of TKey)
Dim returnValue As IQbservable(Of TSource)

returnValue = source.DistinctUntilChanged(keySelector, _
    comparer)
public static IQbservable<TSource> DistinctUntilChanged<TSource, TKey>(
    this IQbservable<TSource> source,
    Expression<Func<TSource, TKey>> keySelector,
    IEqualityComparer<TKey> comparer
)
[ExtensionAttribute]
public:
generic<typename TSource, typename TKey>
static IQbservable<TSource>^ DistinctUntilChanged(
    IQbservable<TSource>^ source, 
    Expression<Func<TSource, TKey>^>^ keySelector, 
    IEqualityComparer<TKey>^ comparer
)
static member DistinctUntilChanged : 
        source:IQbservable<'TSource> * 
        keySelector:Expression<Func<'TSource, 'TKey>> * 
        comparer:IEqualityComparer<'TKey> -> IQbservable<'TSource> 
JScript does not support generic types and methods.

Type Parameters

  • TSource
    The type of source.

  • TKey
    The type of key.

Parameters

Return Value

Type: System.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence only containing the distinct contiguous elements, based on a computed key value, 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 IQbservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .

See Also

Reference

Qbservable Class

DistinctUntilChanged Overload

System.Reactive.Linq Namespace