Circular Dependency in Two Projects in C#

Question

I have two projects in a solution named ProjectA (ConsoleApplication) and ProjectB (ClassLibrary). ProjectA has a reference to ProjectB. Generally speaking, ProjectA calls a

Answer 1

I would actually create your own event on ClassB

public event EventHandler MySpecialHook;

EventHandler is a standard delegate of

public delegate void EventHandler(object sender, EventArgs e);

Then, in your Class A, after creating your instance of ClassB, hook into the event handler for notification when something occurs in B that A should know about. Much like an OnActivated, OnLostFocus, OnMouseMove or similar events (but they have delegate different signatures)

public class ClassB {

public event EventHandler MySpecialHook;

public void SomeMethodDoingActionInB()
{

    // do whatever you need to.
    // THEN, if anyone is listening (via the class A sample below)
    // broadcast to anyone listening that this thing was done and 
    // they can then grab / do whatever with results or any other 
    // properties from this class as needed.
    if( MySpecialHook != null )
        MySpecialHook( this, null );
 } 
}

public class YourClassA
{

   ClassB YourObjectToB;

   public YourClassA
   {
      // create your class
      YourObjectToB = new ClassB();
      // tell Class B to call your "NotificationFromClassB" method
      // when such event requires it
      YourObjectToB += NotificationFromClassB;
   }

   public void NotificationFromClassB( object sender, EventArgs e )
   {
      // Your ClassB did something that your "A" class needs to work on / with.
      // the "sender" object parameter IS your ClassB that broadcast the notification.
   }
}