asp.net listbox实现单选全选取消_实用技巧_

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using BLL;
using Model;
public partial class Boarding_HarmSelRoleEmp : System.Web.UI.Page
{
protected void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{

if (BLL.EmailUser.GetEmailUserByID(Session["username"].ToString()).userCompany.ToString() == "北京")//登录判断

{

//左侧listbox绑定部门
this.UserList.Items.Clear();
this.UserList.Items.Add(new ListItem("总董事长办公室", "总董事长办公室"));
this.UserList.Items.Add(new ListItem("财务", "财务"));
this.UserList.Items.Add(new ListItem("市场", "市场"));
this.UserList.Items.Add(new ListItem("行政", "行政"));
this.UserList.Items.Add(new ListItem("IT", "IT"));
}

}
}
protected void cmdAdd_Click(object sender, System.EventArgs e)//添加到右侧
{
bool exist=false;//判断在右侧是否存在，不存在则将左侧部门添加到右侧
foreach( ListItem li in lstSelEmp.Items)
{
if(li.Value==UserList.SelectedItem.Value)
{
exist=true;
}
}
if(exist==false)
{
lstSelEmp.Items.Add(new ListItem(UserList.SelectedItem.Text,UserList.SelectedItem.Value));
}
}
protected void cmdDel_Click(object sender, System.EventArgs e)//取消右侧选择
{
lstSelEmp.Items.Remove(lstSelEmp.SelectedItem);
}
protected void cmdDelAll_Click(object sender, System.EventArgs e)//全部取消右侧选择
{
for(int i=0;ilstSelEmp.Items.Remove(lstSelEmp.Items[i]);
}
protected void cmdAddAll_Click(object sender, System.EventArgs e)//全部添加到右侧
{
foreach(ListItem li in UserList.Items)
{
bool exist=false;
foreach( ListItem lised in lstSelEmp.Items)
if(lised.Value==li.Value)
exist=true;
if(exist==false)
lstSelEmp.Items.Add(new ListItem(li.Text,li.Value));
}
}
public string pass()
{
string txt="";
for(int j=0;j < lstSelEmp.Items.Count;j++)
{
txt+=lstSelEmp.Items[j];
txt+="','";
}
return txt;
}
}