Question

Let’s say I have an enum called eEventID that contains 10 events, mEvent1 - mEvent10 with int values 10001 – 10010 . I want to use an input value (e.g. 10007) to check if a member in the enum has the corresponding value. Once I find the event with the corresponding input value, I then take that event and register a method to it by hooking up a delegate (This is assuming I have all the necessary code). I just need to know if a member in the enum has a value that is the same as the input value, then register a new method to that event. How do I look for a certain event using only an input value? I’m guessing a for-loop or any other loop isn’t my best bet.

EDIT: this is what I have so far…

public delegate void EventDel(int mEvtIdx);

public enum eVtEvtId
{
    Event1,
    Event2,
    Event3,
    Event4,
    Event5,
    Event6,
    Event7,
    Event8,
    Event9,
    Event10,

}

public void Subscribe(int mInVal)
{
    eVtEvtID mEventID;
    int mEventIndex = mInVal;

    if(Enum.IsDefined(typeof(mEventID), mEventIndex))
    {
        mEventID += EventDelegate([insert method here])
    }

    else
    {
        // will warn the user that the event does
        // not yet exist in the enum
    }

}

Answer 1

Here’s an example that demonstrates how you would take a value (reading it from the console) map it to the numeric value corresponding to an enum member, locate the corresponding event (in this case on the Program class) and attach an event handler to it.

using System;

namespace ConsoleApplication6
{
    public enum Events
    {
        Event1 = 10001,
        Event2 = 10002,
        Event3 = 10003,
        Event4 = 10004,
        Event5 = 10005,
        Event6 = 10006,
        Event7 = 10007,
        Event8 = 10008,
        Event9 = 10009,
        Event10 = 10010
    }

    public class Program
    {
        public static event Action Event1;
        public static event Action Event2;
        public static event Action Event3;
        public static event Action Event4;
        public static event Action Event5;
        public static event Action Event6;
        public static event Action Event7;
        public static event Action Event8;
        public static event Action Event9;
        public static event Action Event10;

        private static void OnEvent1()
        {
            if(Event1 != null)
            {
                Event1();
            }
        }

        private static void OnEvent2()
        {
            if (Event2 != null)
            {
                Event2();
            }
        }

        private static void OnEvent3()
        {
            if (Event3 != null)
            {
                Event3();
            }
        }

        private static void OnEvent4()
        {
            if (Event4 != null)
            {
                Event4();
            }
        }

        private static void OnEvent5()
        {
            if (Event5 != null)
            {
                Event5();
            }
        }

        private static void OnEvent6()
        {
            if (Event6 != null)
            {
                Event6();
            }
        }

        private static void OnEvent7()
        {
            if (Event7 != null)
            {
                Event7();
            }
        }

        private static void OnEvent8()
        {
            if (Event8 != null)
            {
                Event8();
            }
        }

        private static void OnEvent9()
        {
            if (Event9 != null)
            {
                Event9();
            }
        }

        private static void OnEvent10()
        {
            if (Event10 != null)
            {
                Event10();
            }
        }

        static void Main(string[] args)
        {
            while(true)
            {
                var input = Console.ReadLine();

                if(input == "q")
                {
                    return;
                }

                int value;

                if(int.TryParse(input, out value))
                {
                    var eventValue = (Events) value;
                    var eventName = Enum.GetName(typeof (Events), eventValue);

                    var matchingEvent = typeof(Program).GetEvent(eventName);

                    if (matchingEvent != null)
                    {
                        var action = new Action(() => Console.WriteLine("Event " + eventName + " has been handled"));
                        matchingEvent.AddEventHandler(null, action);
                    }

                }

                OnEvent1();
                OnEvent2();
                OnEvent3();
                OnEvent4();
                OnEvent5();
                OnEvent6();
                OnEvent7();
                OnEvent8();
                OnEvent9();
                OnEvent10();
            }
        }
    }
}