Is there is a fluent approach to handling WinForm event?

Question

I was handling yet another KeyDown event in a user control when I wondered if it existed a library for typing fluent code for handling event like

editor.When(Keys.F).IsDown().With(Keys.Control).Do((sender, e) => ShowFindWindow());

Does that exist?

Answer 1

I downloaded the Reactive Extension Framework for the .Net Framework 3.5 SP1.

I was able to do the same:

Observable.FromEvent<KeyEventArgs>(this, "KeyDown")
    .Where(e => e.EventArgs.KeyCode == Keys.F && e.EventArgs.Modifiers == Keys.Control)
    .Subscribe(e => MessageBox.Show(e.EventArgs.KeyData.ToString()));

This is some pretty powerful stuff.

Answer 2

.NET 4 will introduce the reactive framework (IObservable<T>, IObserver<T> and helper extension types) which should offer exactly this.