GroupBy(TSource, TKey) Method (IQbservable(TSource), Expression(Func(TSource, TKey)))

Qbservable.GroupBy<TSource, TKey> Method (IQbservable<TSource>, Expression<Func<TSource, TKey>>)

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)

public static IQbservable<IGroupedObservable<TKey, TSource>> GroupBy<TSource, TKey>(
	this IQbservable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector

Type Parameters


The type source.


The type key.


Type: System.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence whose elements to group.
Type: System.Linq.Expressions.Expression<Func<TSource, TKey>>
A function to extract the key for each element.

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 or
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