Question

Can anyone help me please!

I tried to implement something that in C# is:

var keysIO =   Observable.FromEvent<KeyDownEventHandler, RoutedEventArgs>(
                                h => new KeyDownEventHandler(h),
                                h => btn.KeyDown += h,
                                h => btn.KeyDown -= h));

How to write that in VB?

Thank you,
R

Answer 1

I first got your code to compile on my machine:

var keysIO = Observable.FromEvent<KeyEventHandler,KeyEventArgs>(
                                    h => btn.KeyDown += h, 
                                    h => btn.KeyDown -= h);

Then I opened it in Reflector and modfied to

Dim keysIO As IObservable(Of KeyEventArgs) = _
        Observable.FromEvent(Of KeyEventHandler, KeyEventArgs)( _
            (Sub(h) AddHandler btn.KeyDown, h), _
            (Sub(h) RemoveHandler btn.KeyDown, h))