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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)

generic<typename TSource, typename TKey>
static IQbservable<TSource>^ DistinctUntilChanged(
	IQbservable<TSource>^ source, 
	Expression<Func<TSource, TKey>^>^ keySelector

Type Parameters


The type of source.


The type of key.


Type: System.Reactive.Linq::IQbservable<TSource>
A queryable observable sequence to retain distinct contiguous elements for, based on a computed key value.
Type: System.Linq.Expressions::Expression<Func<TSource, TKey>>
A function to compute the comparison key for each element.

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 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.
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