<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="ListBox.aspx.cs" Inherits="WebApplication1.ListBox" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:ListBox ID="listUsers" runat="server" SelectionMode="Multiple"></asp:ListBox> <asp:Button ID="btnOK" runat="server" Text="确定" onclick="btnOK_Click" /> </div> </form> </body> </html>
CS：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Data.SqlClient; using System.Data; namespace WebApplication1 { public partial class ListBox : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { BindUserList(); } } private void BindUserList() { SqlConnection conn = new SqlConnection(@"server=Rose-PCSQLEXPRESS;Database=User;User Id=sa;password="); SqlCommand command = new SqlCommand("Select ID,RealName from UserInfo", conn); SqlDataAdapter adapter = new SqlDataAdapter(command); DataTable data = new DataTable(); adapter.Fill(data); listUsers.DataTextField = "RealName"; listUsers.DataValueField = "ID"; listUsers.DataSource = data; listUsers.DataBind(); } protected void btnOK_Click(object sender, EventArgs e) { string selectedUserName = string.Empty; //遍历ListBox中的每一个选项 foreach (ListItem item in listUsers.Items) { //如果项被选中 if (item.Selected) { selectedUserName += item.Value + ","; } } //至少有一项被选中 if (!string.IsNullOrEmpty(selectedUserName)) { //删除最后一个“，”符号 selectedUserName = selectedUserName.Remove(selectedUserName.Length - 1); } Response.Write("你选择的用户编号有："+selectedUserName); } } }