Qbservable.FromEvent<TEventArgs> Method (IQbservableProvider, Expression<Action<Action<TEventArgs>>>, Expression<Action<Action<TEventArgs>>>)

Converts a .NET event to a queryable observable sequence.

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

public static IQbservable<TEventArgs> FromEvent<TEventArgs>(
	this IQbservableProvider provider,
	Expression<Action<Action<TEventArgs>>> addHandler,
	Expression<Action<Action<TEventArgs>>> removeHandler

Type Parameters


The type of event.


Type: System.Reactive.Linq.IQbservableProvider
The local Qbservable provider.
Type: System.Linq.Expressions.Expression<Action<Action<TEventArgs>>>
Action that attaches the given event handler to the underlying .NET event.
Type: System.Linq.Expressions.Expression<Action<Action<TEventArgs>>>
Action that detaches the given event handler from the underlying .NET event.

Return Value

Type: System.Reactive.Linq.IQbservable<TEventArgs>
Observable sequence that contains data representations of invocations of the underlying .NET event.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type IQbservableProvider. 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.