Passing EventHandler between several classes

I am creating a gui widget a dll library, a class that derives from a FORM (I thought about usercontrol but it doesn't have built in properties like Opacity and some more that i need).

Because I don't want to expose to the user of this control all the standard methods and propertis that this derived class will inherit, I've created a nothe class "middle-man" that should encapsulate and expose only the needed methos to the user of this dll.

The problem is exposing the events.

This is an abstract example:

 class Class1
    {
        Class2 theClass2;
        public Class1()
        {
            theClass2 = new Class2();
            theClass2. += new EventHandler(theClass3_EventHandler);
            theClass2.TriggerEvent();
        }

        void theClass3_EventHandler(object sender, EventArgs e)
        {
            throw new NotImplementedException();
        }

    }

    class Class2
    {
        Class3 theClass3;


        public Class2()
        {
            theClass3 = new Class3();

        }

        public void TriggerEvent()
        {
            theClass3.Trigger();
        }


        class Class3
        {
            public event EventHandler theEvent;

            public void Trigger()
            {
           开发者_运维技巧     if (this.theEvent != null)
                    theEvent(this, new EventArgs());
            }


        }
    }

public event EventHandler theEvent {
    add {
      SomeNestedClass.theEvent += value;
    }
    remove {
      SomeNestedClass.theEvent -= value;
    }
}

First of all, inheritance is a is-a relationship. That means that everything that a Form can do should all sub classes be able to do. Since this is not the case for you, you should not derive the form.

As for the events. You need to redefine them in your "middle-man" class. And in that class simply subscribe on the events from the form and trigger them in the handler methods.

public class MyCoolControl : Control
{
    private Form _customForm;

    public MyCoonControl()
    {
       _customForm.Clicked += (source, e) => Clicked(source,e);
    }

    public event EventHandler Clicked = delegate {};
}