禁用或启用DropDownList的Items

来源：未知责任编辑：责任编辑发表时间:2014-05-26 11:00　点击:次

此篇算是对http://www.2cto.com/kf/201204/127918.html重构升级。
因为网友需要不但能禁用还能可以启用DropDownList的Items。为了不想用户写太多代码。Insus.NET写了一个类别，并让它继承了System.Web.UI.WebControls命名空间下的DropDownList. 可从下图看到InsusDropDownList实例化并传入DropDownList控件，然后实例化之后的对象，就是可以使用highlight的四个方法DisableImsByText(), DisabletemsByVue() ,EnableItemsBText(), EnableItemsByValue()。

InsusDropDownList类别：
InsusDropDownList

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;

/// <summary>
/// Summary description for InsusDropDownList
/// </summary>
namespace Insus.NET
{
    public class InsusDropDownList : DropDownList
    {
        DropDownList _DropDownList;

        public InsusDropDownList(DropDownList dropDownList)
        {
            this._DropDownList = dropDownList;
        }

        public void DisableItemsByText(string text)
        {
            DisableItems(GetIndexByText(text));
        }

        public void EnableItemsByText(string text)
        {
            EnableItems(GetIndexByText(text));
        }

        public void DisableItemsByValue(string value)
        {
            DisableItems(GetIndexByValue(value));
        }

        public void EnableItemsByValue(string value)
        {
            EnableItems(GetIndexByValue(value));
        }

        private int GetIndexByText(string text)
        {
            return this._DropDownList.Items.IndexOf(this._DropDownList.Items.FindByText(text));