[RESOLVED] Addhandler for custon event with MouseEventArgs

[opus]

I managed to to raise an event from a UserControl which is then handled in the MainForm (See this Thread)

I've done
In UserControl:
Declaring Public Event by

 Public Event PublicEventUserGram As EventHandler

Raising the Event in correct Event-Routine with the correct MyMouseEventArg by

 RaiseEvent PublicEventUserGram(Me, MyMouseEventArg)

In the parent form:
Changing the PictureBox_MouseUp to be Private
When creating new instances of the UserControl adding the EventHandle by

AddHandler NewUserGram.PublicEventUserGram, AddressOf PictureBox_MouseUp

However, I had Option Strict OFF in the MainForm. After selection it to ON, I get an error saying an implicit typeconversion from MouseEventArgs to EventArgs was needed.
If I declare the Public Event explicitly with "(ByVal sender As Object, ByVal e As MouseEventArgs)" I get an error that an event can't have a return value.

Do I need to create a Sub with perfect matching arguments in the mainform, that in turn changes to EventArg to a MouseEventArg an then calls the needed Sub?
Or is there a better way?

[jmcilhinney]

Um, if your event declaration is like this:

Public Event PublicEventUserGram As EventHandler

then you don't raise the event like this:

RaiseEvent PublicEventUserGram(Me, MyMouseEventArg)

You raise it like this:

RaiseEvent PublicEventUserGram(Me, EventArgs.Empty)

If you do want to raise it like this:

RaiseEvent PublicEventUserGram(Me, MyMouseEventArg)

then you declare it like this:

Public Event PublicEventUserGram As EventHandler(Of MyMouseEventArg)

The event handler should then look like this:

Private Sub SomeMethod(sender As Object, e As MyMouseEventArg)

You can handle the event with a method like this:

Private Sub SomeMethod(sender As Object, e As EventArgs)

because MyMouseEventArg inherits EventArgs but, unless MyMouseEventArg inherits MouseEventArgs, you cannot handle it with a method that looks like this:

Private Sub SomeMethod(sender As Object, e As MouseEventArgs)

By the way, you should follow convention and name your class MyMouseEventArgs.

[jmcilhinney]

You might benefit from following the Blog link in my signature below and checking out my post on Custom Events.

[opus]

Thanks jmcilhinney,
using the correct declaration was what I needed.
Sorry for the typo in MyMouseEventArgs, I did not try to come up with a new naming concept, just missed the s (and copied that mistake throughout).