gistfile1.cs

public static IDictionary<TK, TV> EnumToMap<TEnum>() {
  return EnumToMap(typeof(TEnum));
}

public static IDictionary<TK, TV> EnumToMap(params Type[] enumTypes) {
  return 
    enumTypes
    .SelectMany(enumType => {
        Enum.GetValues(enumType)
        .Select(v => new { Key = Enum.GetName(enumType, Value = (TV)v });
    })
    .ToDictionary(entry => entry.Key, entry => entry.Value);
}