using System;

using System.Collections.Generic;

​

/* ERROR DEFS */

public class ErrorMessage

{

}

​

public delegate void ErrorHandler(ErrorMessage error);

​

/* ERROR PRODUCER */

public class BusinessLogic

{

    public void Process(int num, ErrorHandler errorHandler)

    {

        // THINGS HAPPEN HERE

        errorHandler(new ErrorMessage());

        errorHandler(new ErrorMessage());

        errorHandler(new ErrorMessage());

    }

}

​

public class Program

{

    public static void Main()

    {

        BusinessLogic logic = new();

        List<ErrorMessage> errors = new List<ErrorMessage>();

        void errorHandler(ErrorMessage msg)

        {

            errors.Add(msg);

        }

        logic.Process(5, errorHandler);

        foreach (ErrorMessage error in errors)

        {

            Console.WriteLine("Error Occurred");

        }

    }

}