cachecaching.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_13_2
{
	/// <summary>
	/// Summary description for CacheCaching.
	/// </summary>
	public class CacheCaching : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.DataGrid myDataGrid;
		private readonly string SQLCONNECTIONSTRING = ConfigurationSettings.AppSettings["SQLCONNECTIONSTRING"].ToString();

		private void Page_Load(object sender, System.EventArgs e)
		{
			if(!Page.IsPostBack)
			{
				DataSet ds = new DataSet();
				ds = (DataSet)Context.Cache["CachingData"];
				
				if(ds == null)
				{
					ds = GetData();
					Context.Cache.Insert("CachingData",ds);
//					Context.Cache.Insert("CachingData",ds,null,DateTime.Now.AddMinutes(20),TimeSpan.Zero);
				}

				myDataGrid.DataSource = ds;
				myDataGrid.DataBind();
			}
		}

		private DataSet GetData()
		{
			SqlConnection myConnection = new SqlConnection(SQLCONNECTIONSTRING);
			String cmdText = "SELECT TOP 15 *  FROM Staff";
			SqlDataAdapter da = new SqlDataAdapter(cmdText,myConnection);
			myConnection.Open();

			DataSet ds = new DataSet();
			da.Fill(ds);			
			myConnection.Close();

			return(ds);
		}

		#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
	}
}