zoukankan html css js c++ java

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

 1 <%@ Page Language="C#" AutoEventWireup="true" CodeFile="MyListBox.aspx.cs" Inherits="MyListBox" %>
 2 
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
 4 
 5 <html xmlns="http://www.w3.org/1999/xhtml">
 6 <head runat="server">
 7     <title></title>
 8     <style type="text/css">
 9         .style2
10         {
11              96px;
12         }
13         .style3
14         {
15              100px;
16         }
17         .style4
18         {
19              199px;
20         }
21     </style>
22 </head>
23 <body bgcolor="#cccccc">
24     <form id="form1" runat="server">
25     <div>
26     
27         <table>
28             <tr>
29                 <td class="style2" rowspan="6">
30                     <asp:ListBox ID="SourceList" runat="server" Height="160px" Width="200px">
31                     </asp:ListBox>
32                 </td>
33                 <td class="style3">
34                     &nbsp;</td>
35                 <td class="style4" rowspan="6">
36                     <asp:ListBox ID="DirectList" runat="server" Height="160px" Width="200px"></asp:ListBox>
37                 </td>
38             </tr>
39             <tr>
40                 <td class="style3" align="center">
41                     <asp:Button ID="btnAddOne" runat="server" Text="&gt;" CommandName="addOne" 
42                         Height="25px" onclick="AddAndDelete_Command" Width="50px" />
43                 </td>
44             </tr>
45             <tr>
46                 <td class="style3" align="center">
47                     <asp:Button ID="btnAddAll" runat="server" Text="&gt;&gt;" CommandName="addAll" 
48                         Height="25px" onclick="AddAndDelete_Command" Width="50px" />
49                 </td>
50             </tr>
51             <tr>
52                 <td class="style3" align="center">
53                     <asp:Button ID="btnDeleteOne" runat="server" Text="&lt;" 
54                         CommandName="deleteOne" Height="25px" onclick="AddAndDelete_Command" 
55                         Width="50px" />
56                 </td>
57             </tr>
58             <tr>
59                 <td class="style3" align="center">
60                     <asp:Button ID="btnDeleteAll" runat="server" Text="&lt;&lt;" 
61                         CommandName="deleteAll" Height="25px" onclick="AddAndDelete_Command" 
62                         Width="50px" />
63                 </td>
64             </tr>
65             <tr>
66                 <td class="style3">
67                     &nbsp;</td>
68             </tr>
69             </table>
70     
71         <br />
72         <asp:Label ID="lblSucessMessage" runat="server" Text="请选中列表控件中的数据"></asp:Label>
73     
74     </div>
75     </form>
76 </body>
77 </html>

2、后台代码

  1 using System;
  2 using System.Collections.Generic;
  3 using System.Linq;
  4 using System.Web;
  5 using System.Web.UI;
  6 using System.Web.UI.WebControls;
  7 using System.Data;
  8 using System.Data.SqlClient;
  9 using System.Configuration;
 10 
 11 public partial class MyListBox : System.Web.UI.Page
 12 {
 13     protected void Page_Load(object sender, EventArgs e)
 14     {
 15         if (!IsPostBack)
 16         {
 17             //让按钮事件和AddAndDelete_Command方法建立关联
 18             this.btnAddOne.Command += new CommandEventHandler(this.AddAndDelete_Command);
 19             this.btnAddAll.Command += new CommandEventHandler(this.AddAndDelete_Command);
 20             this.btnDeleteOne.Command += new CommandEventHandler(this.AddAndDelete_Command);
 21             this.btnDeleteAll.Command += new CommandEventHandler(this.AddAndDelete_Command);
 22 
 23             //另一种建立关联的写法
 24             //this.btnAddOne.Click += new EventHandler(this.AddAndDelete_Command);
 25             //this.btnAddAll.Click += new EventHandler(this.AddAndDelete_Command);
 26             //this.btnDeleteOne.Click += new EventHandler(this.AddAndDelete_Command);
 27             //this.btnDeleteAll.Click += new EventHandler(this.AddAndDelete_Command);
 28 
 29             //加载并显示数据
 30             GetUserName();
 31         }
 32     }
 33 
 34     //加载数据,绑定到SourceList控件
 35     private void GetUserName()
 36     {
 37         //清空ListBox控件的所有数据项
 38         SourceList.Items.Clear();
 39 
 40         //连接、读取数据，并把数据绑定到SourceList控件
 41         string con = ConfigurationManager.ConnectionStrings["SqlConn"].ConnectionString;
 42         SqlConnection myCon = new SqlConnection(con);
 43         string cmdText = "SELECT UI_UserID,UI_UserName FROM tb_UserInfo ORDER BY UI_UserID";
 44         SqlCommand myCom = new SqlCommand(cmdText, myCon);
 45 
 46         myCon.Open();
 47         SqlDataReader myReader = myCom.ExecuteReader();
 48 
 49         while (myReader.Read())
 50         {
 51             SourceList.Items.Add(new ListItem(myReader["UI_UserName"].ToString(), myReader["UI_UserID"].ToString()));
 52         }
 53 
 54         myReader.Close();
 55         myCon.Close();
 56     }
 57 
 58     //根据按钮控件的CommandName属性进行判断而进行不同的操作
 59     public void AddAndDelete_Command(object sender, System.EventArgs e)
 60     {
 61         string commandName = ((Button)sender).CommandName;
 62 
 63         switch (commandName)
 64         {
 65             case "addOne":
 66                 if (SourceList.SelectedIndex > -1)
 67                 {
 68                     DirectList.Items.Add(SourceList.SelectedItem);
 69                     lblSucessMessage.Visible = false;
 70                 }
 71                 else
 72                 {
 73                     lblSucessMessage.Visible = true;
 74                 }
 75                 break;
 76             case "addAll":
 77                 lblSucessMessage.Visible = false;
 78                 DirectList.Items.Clear();
 79                 foreach (ListItem item in SourceList.Items)
 80                 {
 81                     DirectList.Items.Add(item);
 82                 }
 83                 break;
 84             case "deleteOne":
 85                 if (DirectList.SelectedIndex > -1)
 86                 {
 87                     DirectList.Items.Remove(DirectList.SelectedItem);
 88                     lblSucessMessage.Visible = false;
 89                 }
 90                 else
 91                 {
 92                     lblSucessMessage.Visible = true;
 93                 }
 94                 break;
 95             case "deleteAll":
 96                 lblSucessMessage.Visible = false;
 97                 DirectList.Items.Clear();
 98                 break;
 99             default: break;
100         }
101 
102         //清空两个列表控件的选项
103         SourceList.SelectedIndex = -1;
104         DirectList.SelectedIndex = -1;
105     }
106 }

查看全文

相关阅读:
hibernate 报query result offset is not supported
MAC下 mySQL及workbench安装
 FC105 FC106 Scale功能块使用说明
 报错！！！Servlet.service() for servlet [action] in context with path [/myssh] threw exception [java.lang.NullPointerException] with root cause java.lang.NullPointerException
PLC300寻址指令
 vscode 配置
 Integrate Intellij with Cygwin
Configure VSCode
Linux下安装gradle
Linux下安装nodejs-源码安装

原文地址：https://www.cnblogs.com/ElvisZhongShao/p/3939267.html