using System;

​

public class Program // Subscriber Class

{

    public static void Main()

    {

        // 8.Instantiate the publisher class

        EventLogicClass elObj = new EventLogicClass();

        // 9. subscribe to the event

        elObj.CompletedProc += elObj_CompletedProc;

        // 11. (Invoke che method that start the procedure)

        elObj.StartProc();

    }

​

    // 10. Event handler method

    // Previous method ****

    // public static void elObj_CompletedProc(object sender, bool TheResult)

    public static void elObj_CompletedProc(object sender, MyEventArgs result) // ****

    {

        Console.WriteLine($"Random number is {result.Nr} which is {result.TheResult} ");

    }

}

​

// 1. New Class for data type ****

public class MyEventArgs : EventArgs

{

    public bool TheResult { get; set; }

    public int Nr { get; set; }

}

​

public class EventLogicClass // 2. Publisher Class

{

    // 3. Declare the event

    // Previous Event ****

    //public event EventHandler<bool> CompletedProc;

    public event EventHandler<MyEventArgs> CompletedProc;

​

    public void StartProc()  // 4. First method

    {

        // some new logic here

        MyEventArgs objDataToPass = new MyEventArgs();

        Random rnd = new Random();

        int nr = rnd.Next(2);

        Console.WriteLine($"Process Started! {nr}");

        objDataToPass.Nr = nr; // ****

        // 5. invoke second method

        // ... OnCompletedProc(false) ... // Previous invocation ****

        if (nr == 0)

        {

            objDataToPass.TheResult = false; // ****

            OnCompletedProc(objDataToPass);  // ****

        }

        else

        {

            objDataToPass.TheResult = true; // ****

            OnCompletedProc(objDataToPass); // ****

        }

    }

​

    // 6. Second method

    // protected virtual void OnCompletedProc(bool result) // Previous method ****

    protected virtual void OnCompletedProc(MyEventArgs result) // ****

    {

        // 7. Call all registered Event Handlers

        CompletedProc?.Invoke(this, result); // ****

    }

}