myaspnetobject.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.Configuration;
using System.Data.SqlClient;

namespace Example_13_1
{
	/// <summary>
	/// Summary description for MyASPNETObject.
	/// </summary>
	public class MyASPNETObject : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DataGrid myDataGrid;
		private readonly string SQLCONNECTIONSTRING = ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ToString();
	    private int sUserID = 1;

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				///获取数据
				DataSet ds = new DataSet();
				ds = (DataSet)Application["CachingData"];
				
				if(ds == null)
				{
					///使用Application对象缓存数据
					ds = GetData();
					Application.Lock();
					Application["CachingData"] = ds;
					Application.UnLock();

					///使用Session对象缓存数据
					Session["CachingData"] = ds;
				}

				///绑定控件的数据
				myDataGrid.DataSource = ds;
				myDataGrid.DataBind();

				///调用Application对象处理函数和Session对象处理函数
				ControlApplication();
				ControlSession();
			}
		}

		private DataSet GetData()
		{
			///从数据库获取数据
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);
			String cmdText = "Select *  from Staff";
			SqlDataAdapter da = new SqlDataAdapter(cmdText,myConnection);
			myConnection.Open();

			///填充数据集DataSet
			DataSet ds = new DataSet();
			da.Fill(ds);			
			myConnection.Close();

			return(ds);
		}

		private void ControlSession()
		{
			///使用Session对象保存全局数据
			Response.Write("UserIDAdd:");
			Session.Add("UserIDAdd",sUserID);
			Response.Write(Session["UserIDAdd"].ToString());

			Response.Write("       ");

			///显示数据
			Response.Write("UserIDIndex:");
			Session["UserIDIndex"] = sUserID.ToString();
			Response.Write(Session["UserIDIndex"].ToString());

		}

		private void ControlApplication()
		{
			///使用Application对象保存全局数据
			Response.Write("The count of the Application object:");
			Response.Write(Application["Count"].ToString());			

			Response.Write("       ");

			///显示数据
			Response.Write("The count of the Session object:");
			Response.Write(Session["Count"].ToString());
		}


		#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.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion
	}
}