Question

I need to set events on a class library and catch them in an form.

For example, I run a sub in the DLL file, and I need to “receive” the event that the sub in the class is running.

The DLL file is created by me in Visual Basic, but how do I raise events on it to be catched in the form?

Please provide an example.

Answer 1

Code in the dll

 Public Event MySpecialEvent ()

 Private Sub Test 
   RaiseEvent MySpecialEvent
 End Sub

Code in the form

 Private _MyDll as MyDLL

 Public Sub Main
   _MyDLL = New MyDLL
   AddHandler _MyDLL.MySpecialEvent, AddressOf MySpecialEventHandler
 End Sub

 Private Sub MySpecialEventHandler
   'Put your code here to act upon the handled event
 End Sub  

You’ll also need to remove the event handler at some point in the form’s life with

RemoveHandler _MyDLL.MySpecialEvent, AddressOf MySpecialEventHandler