使用sqlCacheDependency

第一步

修改web,config

 
  
 
 
   
  
   
    
         
     
    
   
  
 

第二步.定义cachedData测试类

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Web.Caching;
using System.Data.SqlClient;

///

/// Summary description for CachedData
///

public class CachedData
{
    private string Key;
    private string _Source;
    ///

    /// 指示数据从哪儿读取的
    ///

    public string Source { get { return _Source; } }
 public CachedData()
 {
        Key = "Categories";
        _Source = "未知";
 }

    //读取数据
    public DataView getFromCache() {
        if (HttpRuntime.Cache[Key] == null)
        {
            //取数据
            SqlConnection conn = new SqlConnection();
            conn.ConnectionString = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;
            SqlCommand comm = new SqlCommand("SELECT [CategoryID], [CategoryName], [Description] FROM [Categories]", conn);
            SqlDataAdapter sda = new SqlDataAdapter(comm);
            DataSet ds = new DataSet();
            conn.Open();
            sda.Fill(ds);
            DataView dv = ds.Tables[0].DefaultView;
            conn.Close();

            //启用更改通知
            SqlCacheDependencyAdmin.EnableNotifications(ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString);
            //连接到 SQL Server 数据库并为 SqlCacheDependency 更改通知准备数据库表
            SqlCacheDependencyAdmin.EnableTableForNotifications(ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString, "Categories");
            //制定缓存策略
            SqlCacheDependency scd = new SqlCacheDependency("Categories", "Categories");
            //插入缓存
            HttpRuntime.Cache.Insert(Key, dv, scd);
            _Source = "Database";
            return dv;
        }
        else {
            //从缓存中取值
            _Source = "cache";
            return (DataView)HttpRuntime.Cache[Key];
           
        }
    }
}

3.测试页面

<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.aspx.cs" Inherits="_Default" %>

   


   

       
         
   

其对应cs文件

using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
       
            BindRepeater1();
       
    }
    private void BindRepeater1(){
        CachedData cd=new CachedData();
        this.Repeater1.DataSource = cd.getFromCache();
        this.Repeater1.DataBind();
        this.Label1.Text = cd.Source;
    }
}