Export (0) Print
Expand All

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

Creates a lookup from an observable sequence according to a specified key selector function, and a comparer.

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

public static IObservable<ILookup<TKey, TSource>> ToLookup<TSource, TKey>(
	this IObservable<TSource> source,
	Func<TSource, TKey> keySelector,
	IEqualityComparer<TKey> comparer
)

Type Parameters

TSource

The type of source.

TKey

The type of key.

Parameters

source
Type: System.IObservable<TSource>
An observable sequence to create a lookup for.
keySelector
Type: System.Func<TSource, TKey>
A function to extract a key from each element.
comparer
Type: System.Collections.Generic.IEqualityComparer<TKey>
An equality comparer to compare keys.

Return Value

Type: System.IObservable<ILookup<TKey, TSource>>
A lookup from an observable sequence according to a specified key selector function, and a comparer.

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.aspx or http://msdn.microsoft.com/en-us/library/bb383977.aspx.
Show:
© 2014 Microsoft