Question

I have a problem: imagine I have a plugin-based system.

I need some kind of interface with which I could catch events from every plugin, which implements for example IReporting interface.

(IReporting) object.OnSomeEvent += <.....> 

But I can’t find a way to do that.

Answer 1

Instead of (IReporting)obj.XXX you should write ((IReporting)obj).XXX

public interface IFoo {     event EventHandler Boo; }  class Foo : IFoo {     public event EventHandler Boo;     public void RaiseBoo()     {         if (Boo != null)             Boo(this, EventArgs.Empty);     } }  ...  private void TestClass_Boo(object sender, EventArgs e) {     throw new NotImplementedException(); }      ...     object o = new Foo();    ((IFoo)o).Boo += TestClass_Boo;    ((Foo)o).RaiseBoo(); 

Regarding plugin framework take a look at existing solutions with good architecture, for example MEF