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Observable.ToDictionary<TSource, TKey, TElement> Method (IObservable<TSource>, Func<TSource, TKey>, Func<TSource, TElement>)

Creates a dictionary from an observable sequence according to a specified key selector function, and an element selector function.

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

public static IObservable<IDictionary<TKey, TElement>> ToDictionary<TSource, TKey, TElement>(
	this IObservable<TSource> source,
	Func<TSource, TKey> keySelector,
	Func<TSource, TElement> elementSelector
)

Type Parameters

TSource

The type of source.

TKey

The type of key.

TElement

The type of element.

Parameters

source
Type: System.IObservable<TSource>
An observable sequence to create a dictionary for.
keySelector
Type: System.Func<TSource, TKey>
A function to extract a key from each element.
elementSelector
Type: System.Func<TSource, TElement>
A transform function to produce a result element value from each element.

Return Value

Type: System.IObservable<IDictionary<TKey, TElement>>
The dictionary from an observable sequence according to a specified key selector function, and an element selector function.

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.
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