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

Syntax

'Declaration
<ExtensionAttribute> _
Public Shared Function Distinct(Of TSource, TKey) ( _
    source As IObservable(Of TSource), _
    keySelector As Func(Of TSource, TKey) _
) As IObservable(Of TSource)

'Usage
Dim source As IObservable(Of TSource)
Dim keySelector As Func(Of TSource, TKey)
Dim returnValue As IObservable(Of TSource)

returnValue = source.Distinct(keySelector)

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

[ExtensionAttribute]
public:
generic<typename TSource, typename TKey>
static IObservable<TSource>^ Distinct(
    IObservable<TSource>^ source, 
    Func<TSource, TKey>^ keySelector
)

static member Distinct : 
        source:IObservable<'TSource> * 
        keySelector:Func<'TSource, 'TKey> -> IObservable<'TSource> 

JScript does not support generic types and methods.

Type Parameters

• TSource
  The type of source.

• TKey
  The type of key.

Parameters

• source
  Type: System.IObservable<TSource>
  An observable sequence to retain distinct elements for.

• keySelector
  Type: System.Func<TSource, TKey>
  A function to compute the comparison key for each element.

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 or .

See Also

Reference

Observable Class

Distinct Overload

System.Reactive.Linq Namespace