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Observable.GroupByUntil(Of TSource, TKey, TDuration) Method (IObservable(Of TSource), Func(Of TSource, TKey), Func(Of IGroupedObservable(Of TKey, TSource), IObservable(Of TDuration)))

Groups the elements of an observable sequence according to a specified key selector function.

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

'Declaration
<ExtensionAttribute> _
Public Shared Function GroupByUntil(Of TSource, TKey, TDuration) ( _
	source As IObservable(Of TSource), _
	keySelector As Func(Of TSource, TKey), _
	durationSelector As Func(Of IGroupedObservable(Of TKey, TSource), IObservable(Of TDuration)) _
) As IObservable(Of IGroupedObservable(Of TKey, TSource))
'Usage
Dim source As IObservable(Of TSource)
Dim keySelector As Func(Of TSource, TKey)
Dim durationSelector As Func(Of IGroupedObservable(Of TKey, TSource), IObservable(Of TDuration))
Dim returnValue As IObservable(Of IGroupedObservable(Of TKey, TSource))

returnValue = source.GroupByUntil(keySelector, _
	durationSelector)

Type Parameters

TSource

The type source.

TKey

The type key.

TDuration

The type duration.

Parameters

source
Type: System.IObservable(Of TSource)
An observable sequence whose elements to group.
keySelector
Type: System.Func(Of TSource, TKey)
A function to extract the key for each element.
durationSelector
Type: System.Func(Of IGroupedObservable(Of TKey, TSource), IObservable(Of TDuration))
A function to signal the expiration of a group.

Return Value

Type: System.IObservable(Of IGroupedObservable(Of TKey, TSource))
A sequence of observable groups, each of which corresponds to a unique key value, containing all elements that share that same key value.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IObservable(Of 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(v=vs.103).aspx or http://msdn.microsoft.com/en-us/library/bb383977(v=vs.103).aspx.
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