gistfile1.txt

public class MyEnum
{
    public static readonly MyEnum Val1;
    public static readonly MyEnum Val2;
    
    public static MyEnum FromId(int id)
    {
        return MyEnumsById[id];
    }

    public static MyEnum FromName(string name)
    {
        return MyEnumsByName[name];
    }

    public static MyEnum FromOtherProp(string prop)
    {
        return MyEnumsByOtherProp[prop];
    }
    
    private static Dictionary<int, MyEnum> MyEnumsById;

    private static Dictionary<string, MyEnum> MyEnumsByName;
    
    private static Dictionary<string, MyEnum> MyEnumsByOtherProp;

    static MyEnum()
    {
        MyEnumsById = new Dictionary<int, MyEnum>();
        MyEnumsByName = new Dictionary<string, MyEnum>();
        MyEnumsByOtherProp = new Dictionary<string, MyEnum>();
    
        Val1 = new MyEnum ( 21, "val1Name", "foo" );
        Val2 = new MyEnum ( 42, "val2Name", "bar" );
    }

    private MyEnum(int id, string name, string prop)
    {
        Id = id;
        Name = name;
        OtherProp = prop;
        
        MyEnumsById.Add(id, this);
        MyEnumsByName.Add(name, this);
        MyEnumsByOtherProp.Add(prop, this);
    }

    public int Id { get; private set; }

    public string Name { get; private set; }
    
    public string OtherProp { get; private set; }
}