dropdownlist绑定枚举值

public enum EnumActivityType
...{
    Task = 1,
    Fax = 2,
    Phone = 3,
    Email = 4,
    Reminder = 5,
    Appointment = 6,
    Expiration = 7,
    Inquiry = 8
}

		

        public static IList ListTypeForEnum()
        ...{
            ArrayList list = new ArrayList();
            foreach (int i in Enum.GetValues(typeof(EnumActivityType)))
            ...{
                ListItem listitem = new ListItem(Enum.GetName(typeof(EnumActivityType), i), i.ToString());
                list.Add(listitem);
            }
            return list;
        }

		

 
        private void ListType()
        ...{
            drpStatus.Items.Clear();
            drpStatus.DataSource = ListTypeForEnum();
            drpStatus.DataValueField = "value";
            drpStatus.DataTextField = "text";
            drpStatus.DataBind();
        } 

		

/**//// <summary>
/// 紧急程度
/// </summary>
public enum eOA_EmergencyLevel
...{
    [Description("平件")] 
    PinJian= 1,
    
    [Description("急件")]
    JiJian = 2
}

		

    /**////<summary>
    /// 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();