Question

there any way to define enum in c# like below?

public enum MyEnum : string
{
    EnGb = "en-gb",
    FaIr = "fa-ir",
    ...
}

ok, according to erick approach and link, i’m using this to check valid value from provided description:

public static bool IsValidDescription(string description)
{
    var enumType = typeof(Culture);
    foreach (Enum val in Enum.GetValues(enumType))
    {
        FieldInfo fi = enumType.GetField(val.ToString());
        AmbientValueAttribute[] attributes = (AmbientValueAttribute[])fi.GetCustomAttributes(typeof(AmbientValueAttribute), false);
        AmbientValueAttribute attr = attributes[0];
        if (attr.Value.ToString() == description)
            return true;
    }
    return false;
}

any improvement?

Answer 1

Another alternative, not efficient but giving enum functionality is to use an attribute, like this:

public enum MyEnum
{
  [Description("en-gb")]
  EnGb,
  [Description("fa-ir")]
  FaIr,
  ...
}

And something like an extension method, here’s what I use:

public static string GetDescription<T>(this T enumerationValue) where T : struct
{
  var type = enumerationValue.GetType();
  if (!type.IsEnum) throw new ArgumentException("EnumerationValue must be of Enum type", "enumerationValue");
  var str = enumerationValue.ToString();
  var memberInfo = type.GetMember(str);
  if (memberInfo != null && memberInfo.Length > 0)
  {
    var attrs = memberInfo[0].GetCustomAttributes(typeof(DescriptionAttribute), false);
    if (attrs != null && attrs.Length > 0)
      return ((DescriptionAttribute) attrs[0]).Description;
  }
  return str;
}

Then you can call it like this:

MyEnum.EnGb.GetDescription()

If it has a description attribute, you get that, if it doesn’t, you get the .ToString() version, e.g. "EnGb". The reason I have something like this is to use an enum type directly on a Linq-to-SQL object, yet be able to show a pretty description in the UI. I’m not sure it fits your case, but throwing it out there as an option.