Qbservable::GroupByUntil<TSource, TKey, TDuration> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>, Expression<Func<IGroupedObservable<TKey, TSource>, IObservable<TDuration>>>)

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

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

[ExtensionAttribute]
public:
generic<typename TSource, typename TKey, typename TDuration>
static IQbservable<IGroupedObservable<TKey, TSource>^>^ GroupByUntil(
	IQbservable<TSource>^ source, 
	Expression<Func<TSource, TKey>^>^ keySelector, 
	Expression<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.Reactive.Linq::IQbservable<TSource>
A queryable observable sequence whose elements to group.
keySelector
Type: System.Linq.Expressions::Expression<Func<TSource, TKey>>
A function to extract the key for each element.
durationSelector
Type: System.Linq.Expressions::Expression<Func<IGroupedObservable<TKey, TSource>, IObservable<TDuration>>>
A function to signal the expiration of a group.

Return Value

Type: System.Reactive.Linq::IQbservable<IGroupedObservable<TKey, TSource>>
A sequence of queryable 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 IQbservable<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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