C# check for member of enum using input value

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
    }

}

I'm a bit confused, are you trying to dynamically attach an event handler to something or parse a string as an enum member? — mlorbetske
– mlorbetske, Commented Oct 19, 2012 at 5:35
the former, somewhat. I'm trying to get an event from an enum of events, then register methods to it. — Anthony
– Anthony, Commented Oct 19, 2012 at 6:07
Do either of the answers so far help you? If not, could you explain more about what you are trying to do that we have not addressed? — mlorbetske
– mlorbetske, Commented Oct 19, 2012 at 6:14

Marc · Accepted Answer · 2012-10-19 05:33:47Z

4

Use the TryParse method of your enum.

Basically its like this:

YourEnum enumVal;
if (Enum.TryParse(yourInputString, out enumVal)) {
   // use enumVal here
}

answered Oct 19, 2012 at 5:33

Marc

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1 Comment

Anthony Over a year ago

well, what you suggested didn't really help me, but what I read when I went to the link you provided DID help, so I still get to thank you. :D

mlorbetske · Accepted Answer · 2012-10-19 06:10:57Z

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();
            }
        }
    }
}

i'm not mapping the numeric value to the enum. I'm just using the numeric value to see if a member of the enum has the same value as the numeric value I have. I think that one part of the solution I need requires the Enum.IsDefined to be used, but that's as far as I can think of. I'm going to edit my question post, stay tuned.
@Anthony so the names of the members of the enum don't correspond to the names of the events you need to attach handlers to?
yes, they do not correspond to names of events. The members of the enum are events themselves. check my original post, I've added my code there just now.
@Anthony that, by definition, is not possible in .Net enums are constrained to have elements of numeric types
......yeeaaaahh, I'm gonna have to brainstorm with my co-worker again. Damn, this is getting more and more complicated than I thought XD anyway, thanks for the help.

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