events in interfaces

[Brian Henry]

If I have the interface like this

Interface IPluginAddin
Event Loaded()
Event UnLoaded()
End Interface

I have one class implementing the interface, which also will raise the
events... how in the world do i write an event handler in another class or
form for that event which is in the interface? thanks

 

[Imran Koradia]

something like this:

class MyClass
Implements IPluginAddin

Event MyEvent() Implements IPluginAddin.Loaded()
end class

As long as the signatures match, you should be good to go. Since you only
need to match the event signature, a single event can implement multiple
matching interface events which in your case would be something like:

class MyClass
Implements IPluginAddin

Event MyEvent() Implements IPluginAddin.Loaded(),
IPluginAddin.UnLoaded()
end class

If you use delegates, the delegate must be of the same type as the interface
event.

hope this helps..
Imran.

 

[Jay B. Harlow [MVP - Outlook]]

Brian,

how in the world do i write an event handler in another class or form for
that event which is in the interface?

You would write the event handler exactly the same way as you would if the
Event was in a Class!

You can use either WithEvents or AddHandler.

Public WithEvents plugin As IPluginAddin

Public Sub Main()
Dim plugin As IPluginAddin
AddHandler plugin.Loaded, AddressOf Plugin_Loaded
End Sub

Private Sub Plugin_Loaded()

End Sub

Private Sub plugin_UnLoaded() Handles plugin.UnLoaded

End Sub

Hope this helps
Jay