<?xml version="1.0"?>
<configuration><connectionStrings><add name="PubsConnectionString" connectionString="Data Source=10.32.153.165; Initial Catalog=pubs;uid=sa;pwd=q1w2e31@;" providerName="System.Data.SqlClient" /></connectionStrings><system.web><compilation debug="true" targetFramework="4.0" /><caching><sqlCacheDependency enabled = "true" pollTime = "1000" ><databases><!--name:必需的 String 属性。 要添加到配置集合中的 SqlCacheDependencyDatabase 对象的名称。此名称用作 @ OutputCache 指令上 SqlDependency 属性的一部分。pollTime:设置 SqlCacheDependency 轮询数据库表以查看是否发生更改的频率（以毫秒计算）。这儿是一个测试,所以设为10秒,请加大此值connectionStringName 必选的 String 特性。为数据库设置连接字符串名称。 在 connectionStrings 元素（ASP.NET 设置架构） 配置节中引用连接字符串。--><add name="Pubs" connectionStringName = "PubsConnectionString" /></databases></sqlCacheDependency></caching> </system.web>
</configuration>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Caching;
using System.Configuration;
using System.Data.SqlClient;
namespace TestWebSqlCacheDependency
{public partial class _Default : System.Web.UI.Page{string key = "model_type";protected void Page_Load(object sender, EventArgs e){         TextBox1.Text = test();// test();
        } private string test(){//从缓存中取值string model = null;if (HttpRuntime.Cache[key] != null){model = HttpRuntime.Cache[key].ToString();}if (model == null){//取数据model = getDBValue();//启用更改通知
                SqlCacheDependencyAdmin.EnableNotifications(ConfigurationManager.ConnectionStrings["PubsConnectionString"].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["PubsConnectionString"].ConnectionString, "TableTest");//第二个参数是要监控的表名称//制定缓存策略SqlCacheDependency scd = new SqlCacheDependency("Pubs", "TableTest");//注意此处的Pubs需要要配置文件的caching节下的databases节下的name对应，而不是随便写的，目前个人测试的结论就是这样。第二个参数是要监控的表名称//插入缓存
                HttpRuntime.Cache.Insert(key, model, scd);}return model;}private string getDBValue(){SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["PubsConnectionString"].ConnectionString);cn.Open();SqlCommand cd = cn.CreateCommand();cd.CommandText = " select top 1 TableTest.col2 from TableTest ";object o = cd.ExecuteScalar();cn.Close();if (o != null){return o.ToString();}return null;}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.SessionState;
using System.Data.SqlClient;
using System.Web.Caching;
namespace WebTest2
{public class Global : System.Web.HttpApplication{void Application_Start(object sender, EventArgs e){#region SQL2005SqlDependency.Start(ConnectionString_SQL2005);//推荐将这段代码加到Global.asax的Application_Start方法中#endregion}void Application_End(object sender, EventArgs e){SqlDependency.Stop(ConnectionString_SQL2005);}     }
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System;
using System.Configuration;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Caching;
namespace WebTest2
{public partial class _Default : System.Web.UI.Page{protected void Page_Load(object sender, EventArgs e){          DataTable dt = HttpRuntime.Cache["dt"] as DataTable;if (dt == null){using (SqlConnection sqlCon = new SqlConnection(WebConfigHelper.ConnectionString_SQL2005)){sqlCon.Open();SqlCommand sqlCmd = new SqlCommand();sqlCmd.Connection = sqlCon;sqlCmd.CommandText = "select col2 from dbo.TableTest";dt = new DataTable();SqlCacheDependency scd = new SqlCacheDependency(sqlCmd);    SqlDataAdapter sda = new SqlDataAdapter(sqlCmd);                   sda.Fill(dt);            HttpRuntime.Cache.Insert("dt", dt, scd);              sqlCon.Close();}}GridView1.DataSource = dt;GridView1.DataBind();         }      }
}