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

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

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

public static IQbservable<IDictionary<TKey, TElement>> ToDictionary<TSource, TKey, TElement>(
	this IQbservable<TSource> source,
	Expression<Func<TSource, TKey>> keySelector,
	Expression<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.Reactive.Linq.IQbservable<TSource>
A queryable observable sequence to create a dictionary for.
keySelector
Type: System.Linq.Expressions.Expression<Func<TSource, TKey>>
A function to extract a key from each element.
elementSelector
Type: System.Linq.Expressions.Expression<Func<TSource, TElement>>
A transform function to produce a result element value from each element.

Return Value

Type: System.Reactive.Linq.IQbservable<IDictionary<TKey, TElement>>
A dictionary from a queryable 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 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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