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Qbservable.Distinct(Of TSource, TKey) Method (IQbservable(Of TSource), Expression(Of Func(Of TSource, TKey)), IEqualityComparer(Of TKey))

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

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

<ExtensionAttribute> _
Public Shared Function Distinct(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)
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.Distinct(keySelector, _

Type Parameters


The type of source.


The type of key.


Type: System.Reactive.Linq.IQbservable(Of TSource)
A queryable observable sequence to retain distinct elements for.
Type: System.Linq.Expressions.Expression(Of Func(Of TSource, TKey))
A function to compute the comparison key for each element.
Type: System.Collections.Generic.IEqualityComparer(Of TKey)
The equality comparer for source elements.

Return Value

Type: System.Reactive.Linq.IQbservable(Of TSource)
A queryable 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 IQbservable(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.
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