mylisbox.aspx.cs

ASP C#代码实例 适合初学人士学习使用

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Configuration;

namespace Example_6_2
{
	/// <summary>
	/// Summary description for WebForm1.
	/// </summary>
	public class MyShowPicture : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.Button AddOneBtn;
		protected System.Web.UI.WebControls.ListBox SourceList;
		protected System.Web.UI.WebControls.Button AddAllBtn;
		protected System.Web.UI.WebControls.Button DeleteOneBtn;
		protected System.Web.UI.WebControls.Button DeleteAllBtn;
		protected System.Web.UI.WebControls.ListBox DirectList;
		protected System.Web.UI.WebControls.Label SucessMessage;
		private readonly string SQLCONNECTIONSTRING = ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ToString();

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				///绑定源列表控件的数据
				GetSourceListData();
			}
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN: This call is required by the ASP.NET Web Form Designer.
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{    
			this.AddOneBtn.Command += new System.Web.UI.WebControls.CommandEventHandler(this.AddAndDeleteBtn_Command);
			this.AddAllBtn.Command += new System.Web.UI.WebControls.CommandEventHandler(this.AddAndDeleteBtn_Command);
			this.DeleteOneBtn.Command += new System.Web.UI.WebControls.CommandEventHandler(this.AddAndDeleteBtn_Command);
			this.DeleteAllBtn.Command += new System.Web.UI.WebControls.CommandEventHandler(this.AddAndDeleteBtn_Command);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void GetSourceListData()
		{
			///清空ListBox控件的所有数据项
			SourceList.Items.Clear();

			///创建数据库的链接对象
			String cmdText = "SELECT Staff_ID,Staff_Name from Staff ORDER BY Staff_ID";
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);
			SqlCommand myCommand = new SqlCommand(cmdText,myConnection);

			///查询数据库
			myConnection.Open();
			SqlDataReader reader = myCommand.ExecuteReader();				

			///读取SqlDataReader中的数据
			while(reader.Read())
			{
				SourceList.Items.Add(new ListItem(reader["Staff_Name"].ToString(),reader["Staff_ID"].ToString()));				
			}

			///关闭读取器和数据库的链接
			reader.Close();
			myConnection.Close();
		}

		private void AddAndDeleteBtn_Command(object sender, System.Web.UI.WebControls.CommandEventArgs e)
		{
			///获取控件的操作方式
			String commandName = ((Button)sender).CommandName;
			switch(commandName)
			{
				case "addone":
				{
					///添加一个数据项到右边列表框中
					if(SourceList.SelectedIndex > -1)
					{
						DirectList.Items.Add(SourceList.SelectedItem);	
						SucessMessage.Visible = false;
					}
					else
					{
						///显示提示信息
						SucessMessage.Visible = true;
					}
					break;
				}
				case "addall":
				{
					///添加所有数据项到右边列表框中
					SucessMessage.Visible = false;
					DirectList.Items.Clear();
					foreach(ListItem item in SourceList.Items)
					{
						DirectList.Items.Add(item);
					}
					break;
				}
				case "deleteone":
				{
					///删除右边列表框中的一个数据项
					if(DirectList.SelectedIndex > -1)
					{
						DirectList.Items.Remove(DirectList.SelectedItem);
						SucessMessage.Visible = false;
					}
					else
					{
						///显示提示信息
						SucessMessage.Visible = true;
					}
					break;
				}
				case "deleteall":
				{
					///删除右边列表框中的所有数据项
					SucessMessage.Visible = false;
					DirectList.Items.Clear();
					break;
				}
				default:
					break;
			}		

			///清空两个列表框的选项
			SourceList.SelectedIndex = -1;
			DirectList.SelectedIndex = -1;
		}
	}
}