struct EnumWrapper<T> where T : struct {
　private T value; public T Value { get { return value; } }
　public EnumWrapper(T value) { this.value = value; }
　public static explicit operator T(EnumWrapper<T> value) { return value.Value; }
　public static explicit operator EnumWrapper<T>(T value) { return new EnumWrapper<T>(value); }
　public override string ToString(){
　　ToStringAttribute[] attr = (ToStringAttribute[])typeof(T)
　　　.GetField(Value.ToString()).GetCustomAttributes(typeof(ToStringAttribute), false);
　　return (attr.Length != 0) ? return attr[0].String : Value.ToString();}}
[AttributeUsage(AttributeTargets.Field)]class ToStringAttribute : Attribute {
　public string String { get; private set; }
　public ToStringAttribute(string str) { this.String = str; }}

enum MyEnum { [ToString("いちばん")]One, [ToString("二番")]Two, }
こんな風にするとか