How do you trigger an event across classes? - class

Question

I am writing a Class Library that will be used by other applications. I am writing it in C#.NET. I am having a problem with triggering events across classes. Here is what I need to do...
public class ClassLibrary
{
public event EventHandler DeviceAttached;
public ClassLibrary()
{
// do some stuff
OtherClass.Start();
}
}
public class OtherClass : Form
{
public Start()
{
// do things here to initialize receiving messages
}
protected override void WndProc (ref message m)
{
if (....)
{
// THIS IS WHERE I WANT TO TRIGGER THE DEVICE ATTACHED EVENT IN ClassLibrary
// I can't seem to access the eventhandler here to trigger it.
// How do I do it?
}
base.WndProc(ref m);
}
}
Then in the application that is using the class library I will do this...
public class ClientApplication
{
void main()
{
ClassLibrary myCL = new ClassLibrary();
myCL.DeviceAttached += new EventHandler(myCl_deviceAttached);
}
void myCl_deviceAttached(object sender, EventArgs e)
{
//do stuff...
}
}

Answer 1

Probably the easiest option is to add a method to ClassLibrary which raises the event...i.e.
internal void RaiseDeviceAttached(object sender, EventArgs e)
{
if (DeviceAttached != null) DeviceAttached(sender, e);
}
Then, in OtherClass, simply call that method of ClassLibrary.
Another option is to go down the reflection route to trigger the event.