Q

How can I attach handlers to specific events fired from the controls at runtime?

I want to develop an IDE using .NET (VB.NET or C#) for which I need to create the form and controls at runtime that can fire events. I can create the controls, but how do I create a form that responds to events at runtime? Can I do it in .NET or do I have to do it in VC++? If you want to attach at runtime some handlers to specific events fired from the controls, you have to use reflection. First, you get a reference to the EventInfo...

object for the event you want to "catch":

System.Windows.Forms.ListBox myListBox = new System.Windows.Forms.ListBox();
EventInfo ei = typeof(System.Windows.Forms.ListBox).GetEvent
("SelectedIndexChanged");

Next, you can use the AddHandler to attach the method you want to it, provided the signatures match, of course:

ei.AddEventHandler(myListBox, new EventHandler(OnSelectedIndexChanged));

This was first published in June 2003
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