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Observable::GroupByUntil<TSource, TKey, TDuration> Method (IObservable<TSource>, Func<TSource, TKey>, Func<IGroupedObservable<TKey, TSource>, IObservable<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)

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

Type Parameters

TSource

The type source.

TKey

The type key.

TDuration

The type duration.

Parameters

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

Return Value

Type: System::IObservable<IGroupedObservable<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<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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