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Observable.Distinct<TSource, TKey> Method (IObservable<TSource>, Func<TSource, TKey>, IEqualityComparer<TKey>)

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

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

public static IObservable<TSource> Distinct<TSource, TKey>(
	this IObservable<TSource> source,
	Func<TSource, TKey> keySelector,
	IEqualityComparer<TKey> comparer

Type Parameters


The type of source.


The type of key.


Type: System.IObservable<TSource>
An observable sequence to retain distinct elements for.
Type: System.Func<TSource, TKey>
A function to compute the comparison key for each element.
Type: System.Collections.Generic.IEqualityComparer<TKey>
The equality comparer for source elements.

Return Value

Type: System.IObservable<TSource>
An observable sequence only containing the distinct 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 IObservable<TSource>. When you use instance method syntax to call this method, omit the first parameter. For more information, see http://msdn.microsoft.com/en-us/library/bb384936.aspx or http://msdn.microsoft.com/en-us/library/bb383977.aspx.
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