关于Button控件的CommandName属性用法的一个实例

  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 }

前台显示如图：