GetNames and GetValues for enums in Silverlight. Includes cache of results to avoid wasting time in reflection later on.

EnumEx.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;

namespace Charabaruk.Utility
{
    static class EnumEx
    {
        private static Dictionary<Type, Tuple<string[], Array>> cache = new Dictionary<Type,Tuple<string[],Array>>();

        private static void GuardAndGenerate(Type enumType)
        {
            if (!enumType.IsEnum)
                throw new ArgumentException(string.Format("Type '{0}' is not an enum", enumType.Name));

            if (!cache.ContainsKey(enumType))
            {
                string[] names;
                Array values;
                GetEnumData(enumType, out names, out values);
                cache[enumType] = Tuple.Create(names, values);
            }
        }

        public static string[] GetNames(Type enumType)
        {
            GuardAndGenerate(enumType);
            return cache[enumType].Item1;
        }

        public static Array GetValues(Type enumType)
        {
            GuardAndGenerate(enumType);
            return cache[enumType].Item2;
        }

        private static void GetEnumData(Type enumType, out string[] enumNames, out Array enumValues)
        {
            var fields = enumType.GetFields(BindingFlags.Static | BindingFlags.Public);

            string[] names = new string[fields.Length];
            Array values = Array.CreateInstance(enumType, fields.Length);

            for (int i = 0; i < fields.Length; i++)
            {
                values.SetValue(Enum.ToObject(enumType, fields[i].GetValue(null)), i);
                names.SetValue(Enum.GetName(enumType, fields[i].GetValue(null)), i);
            }

            enumNames = names;
            enumValues = values;
        }
    }
}