How can i get from an enum property another string back? [duplicate]

Question

This is my enum and i would like to identify which ID (see ID 1, ID 2) to use by selecting its property name

public enum PermissionScope
{
    
    OfflineAccess = "7427e0e9-2fba-42fe-b0c0-848c9e6a8182"; //ID 1
    Profile = "14dad69e-099b-42c9-810b-d002981feec1"; //ID 2
}

Here is an example of in code.

        string[] scopes = new[] { "offline_access", "Profile" };

                foreach (var scope in scopes)
                {
                    ResourceAccess resourceAccess = new ResourceAccess
                    {
                        Id = PermissionScope(scope), //id should have the values now: 7427e0e9-2fba-42fe-b0c0-848c9e6a8182 and in the 2nd run 14dad69e-099b-42c9-810b-d002981feec1
                        Type = "Scope"
                    };
                }

Description what i would like to achieve:

I want to get the string "7427e0e9-2fba-42fe-b0c0-848c9e6a8182" written into id by calling PermissionScope.OfflineAccess´

simplified example:

            string scope = "offline_access";
            string id = PermissionScope.FindByString(scope); // id = 7427e0e9-2fba-42fe-b0c0-848c9e6a8182

You can't, at least not directly with just an enum. In C# enums are more or less "just" named numbers. You probably want to look at a dictionary — MindSwipe
– MindSwipe, Commented Jan 21 at 8:19
well, your enum-names can be retrieved by using Enum.GetName(typeof(PermissionScope), theEnumValue). However in your case you have an additional underscore. You need some string-magic to transform "offline_access" to "OfflineAccess ". — MakePeaceGreatAgain
– MakePeaceGreatAgain, Commented Jan 21 at 8:25
Hint: To accociate name "offline_access" with PermissionScope.OfflineAccess (those are different) you can use attributes on enum values or create extension method/dictionary. See duplicate for ideas of how accociate enum value with the string. — Sinatr
– Sinatr, Commented Jan 21 at 10:12

Monofuse · Accepted Answer · 2025-01-21 08:18:53Z

I'm not sure there is a way using enums to get strings to return, although you could use an extension method like so:

namespace Test
{
    public enum PermissionScope
    {
        OfflineAccess,
        Profile
    }
    
    public static class PermissionScopeExtension
    {
        public const string OFFLINEACCESS = "7427e0e9-2fba-42fe-b0c0-848c9e6a8182";
        public const string PROFILE = "14dad69e-099b-42c9-810b-d002981feec1";
        
        public static string GetId(this PermissionScope scope)
        {
            return scope switch {
                PermissionScope.OfflineAccess => OFFLINEACCESS,
                PermissionScope.Profile => PROFILE,
                _ => String.Empty
            };
        }
    }
    
    public class Test
    {
        static public void Main(String[] args)
        {
            var e = PermissionScope.OfflineAccess;
            var id = e.GetId();
            Console.WriteLine(id);
        }
    }
}

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