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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.
813
An interface can declare an event. The following example shows how to implement interface events in a class. Basically the rules are the same as when you implement any interface method or property.
An interface can be created to define a contract containing members that classes that implement it must provide. Interfaces can define events, sometimes leading to classes that implement several interfaces being required to declare an event name twice.
Interface can be inherited and implemented by any class and a Delegate can be created for a method on any class, as long as the method suits the method signature of the delegate. An Interface or Delegate is being used by an object. Both have no knowledge of the class that implement.
Events enable a class or object to notify other classes or objects when something of interest occurs. The class that sends (or raises) the event is called the publisher and the classes that receive (or handle) the event are called subscribers.
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
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