Asp.Net 之 枚举类型的下拉列表绑定

/// 学科 
/// </summary> 
public enum Subject 
{ 
     None = 0, 
     [Description("语文")] 
     Chinese = 1, 

     [Description("数学")] 
     Mathematics = 2, 

     [Description("英语")] 
     English = 3, 

     [Description("政治")] 
     Politics = 4, 

     [Description("物理")] 
     Physics = 5, 

     [Description("化学")] 
     Chemistry = 6, 

     [Description("历史")] 
     History = 7, 

     [Description("地理")] 
     Geography = 8, 

     [Description("生物")] 
     Biology = 9 
}

/// 枚举辅助类
    /// </summary>
    public static class EnumHelper
    {
        /// <summary> 
        /// 获得枚举类型数据项（不包括空项）
        /// </summary> 
        /// <param name="enumType">枚举类型</param> 
        /// <returns></returns> 
        public static IList<object> GetItems(this Type enumType)
        {
            if (!enumType.IsEnum)
                throw new InvalidOperationException();

            IList<object> list = new List<object>();

            // 获取Description特性 
            Type typeDescription = typeof(DescriptionAttribute);
            // 获取枚举字段
            FieldInfo[] fields = enumType.GetFields();
            foreach (FieldInfo field in fields)
            {
                if (!field.FieldType.IsEnum)
                    continue;

                 // 获取枚举值
                int value = (int)enumType.InvokeMember(field.Name, BindingFlags.GetField, null, null, null);

                // 不包括空项
                if (value > 0)
                {
                    string text = string.Empty;
                    object[] array = field.GetCustomAttributes(typeDescription, false);

                    if (array.Length > 0) text = ((DescriptionAttribute)array[0]).Description;
                    else text = field.Name; //没有描述，直接取值

                    //添加到列表
                    list.Add(new { Value = value, Text = text });
                }
            }
            return list;
        }
    }

ddlSubject.DataSource = typeof(Subject).GetItems(); 
ddlSubject.DataTextField = "Text"; 
ddlSubject.DataValueField = "Value"; 
ddlSubject.DataBind();