关于Button控件的CommandName属性用法的一个实例

注：本文分享于悠闲的博客，地址：http://www.cnblogs.com/9999/archive/2009/11/24/1609234.html

1、前台的代码

 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyListBox.aspx.cs" Inherits="MyListBox" %>

 <!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>

     <style type="text/css">

         .style2

         {

             width: 96px;

         }

         .style3

         {

             width: 100px;

         }

         .style4

         {

             width: 199px;

         }

     </style>

 </head>

 <body bgcolor="#cccccc">

     <form id="form1" runat="server">

     <div>

         <table>

             <tr>

                 <td class="style2" rowspan="">

                     <asp:ListBox ID="SourceList" runat="server" Height="160px" Width="200px">

                     </asp:ListBox>

                 </td>

                 <td class="style3">

                     &nbsp;</td>

                 <td class="style4" rowspan="">

                     <asp:ListBox ID="DirectList" runat="server" Height="160px" Width="200px"></asp:ListBox>

                 </td>

             </tr>

             <tr>

                 <td class="style3" align="center">

                     <asp:Button ID="btnAddOne" runat="server" Text="&gt;" CommandName="addOne"

                         Height="25px" onclick="AddAndDelete_Command" Width="50px" />

                 </td>

             </tr>

             <tr>

                 <td class="style3" align="center">

                     <asp:Button ID="btnAddAll" runat="server" Text="&gt;&gt;" CommandName="addAll"

                         Height="25px" onclick="AddAndDelete_Command" Width="50px" />

                 </td>

             </tr>

             <tr>

                 <td class="style3" align="center">

                     <asp:Button ID="btnDeleteOne" runat="server" Text="&lt;"

                         CommandName="deleteOne" Height="25px" onclick="AddAndDelete_Command"

                         Width="50px" />

                 </td>

             </tr>

             <tr>

                 <td class="style3" align="center">

                     <asp:Button ID="btnDeleteAll" runat="server" Text="&lt;&lt;"

                         CommandName="deleteAll" Height="25px" onclick="AddAndDelete_Command"

                         Width="50px" />

                 </td>

             </tr>

             <tr>

                 <td class="style3">

                     &nbsp;</td>

             </tr>

             </table>

         <br />

         <asp:Label ID="lblSucessMessage" runat="server" Text="请选中列表控件中的数据"></asp:Label>

     </div>

     </form>

 </body>

 </html>

2、后台代码

 using System;

 using System.Collections.Generic;

 using System.Linq;

 using System.Web;

 using System.Web.UI;

 using System.Web.UI.WebControls;

 using System.Data;

 using System.Data.SqlClient;

 using System.Configuration;

 public partial class MyListBox : System.Web.UI.Page

 {

     protected void Page_Load(object sender, EventArgs e)

     {

         if (!IsPostBack)

         {

             //让按钮事件和AddAndDelete_Command方法建立关联

             this.btnAddOne.Command += new CommandEventHandler(this.AddAndDelete_Command);

             this.btnAddAll.Command += new CommandEventHandler(this.AddAndDelete_Command);

             this.btnDeleteOne.Command += new CommandEventHandler(this.AddAndDelete_Command);

             this.btnDeleteAll.Command += new CommandEventHandler(this.AddAndDelete_Command);

             //另一种建立关联的写法

             //this.btnAddOne.Click += new EventHandler(this.AddAndDelete_Command);

             //this.btnAddAll.Click += new EventHandler(this.AddAndDelete_Command);

             //this.btnDeleteOne.Click += new EventHandler(this.AddAndDelete_Command);

             //this.btnDeleteAll.Click += new EventHandler(this.AddAndDelete_Command);

             //加载并显示数据

             GetUserName();

         }

     }

     //加载数据,绑定到SourceList控件

     private void GetUserName()

     {

         //清空ListBox控件的所有数据项

         SourceList.Items.Clear();

         //连接、读取数据，并把数据绑定到SourceList控件

         string con = ConfigurationManager.ConnectionStrings["SqlConn"].ConnectionString;

         SqlConnection myCon = new SqlConnection(con);

         string cmdText = "SELECT UI_UserID,UI_UserName FROM tb_UserInfo ORDER BY UI_UserID";

         SqlCommand myCom = new SqlCommand(cmdText, myCon);

         myCon.Open();

         SqlDataReader myReader = myCom.ExecuteReader();

         while (myReader.Read())

         {

             SourceList.Items.Add(new ListItem(myReader["UI_UserName"].ToString(), myReader["UI_UserID"].ToString()));

         }

         myReader.Close();

         myCon.Close();

     }

     //根据按钮控件的CommandName属性进行判断而进行不同的操作

     public void AddAndDelete_Command(object sender, System.EventArgs e)

     {

         string commandName = ((Button)sender).CommandName;

         switch (commandName)

         {

             case "addOne":

                 if (SourceList.SelectedIndex > -)

                 {

                     DirectList.Items.Add(SourceList.SelectedItem);

                     lblSucessMessage.Visible = false;

                 }

                 else

                 {

                     lblSucessMessage.Visible = true;

                 }

                 break;

             case "addAll":

                 lblSucessMessage.Visible = false;

                 DirectList.Items.Clear();

                 foreach (ListItem item in SourceList.Items)

                 {

                     DirectList.Items.Add(item);

                 }

                 break;

             case "deleteOne":

                 if (DirectList.SelectedIndex > -)

                 {

                     DirectList.Items.Remove(DirectList.SelectedItem);

                     lblSucessMessage.Visible = false;

                 }

                 else

                 {

                     lblSucessMessage.Visible = true;

                 }

                 break;

             case "deleteAll":

                 lblSucessMessage.Visible = false;

                 DirectList.Items.Clear();

                 break;

             default: break;

         }

         //清空两个列表控件的选项

         SourceList.SelectedIndex = -;

         DirectList.SelectedIndex = -;

     }

 }

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关于Button控件的CommandName属性用法的一个实例

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