asp.net 实现文件缓存依赖，数据库缓存依赖

Asp.net2.0中缓存机制的实现

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;

public partial class _Default : System.Web.UI.Page

{

    string connstr;

    protected void Page_Load(object sender, EventArgs e)

    {

        this.Label1.Text = "";

        connstr = "server=.;dataBase=test;uid=hmhm;password=hmhm";

    }

    private DataTable getInfo()

    {

        using (SqlConnection conn = new SqlConnection(connstr))

        {

            string sql = "select * from A";

            SqlCommand cmd = new SqlCommand(sql, conn);

            conn.Open();

            SqlDataAdapter ada = new SqlDataAdapter(cmd);

            DataTable dt = new DataTable();

            ada.Fill(dt);

            return dt;

        }

        //Response.Write("来自数据库");

         Label1.Text = "来自数据库";

    }

    private void FileDEpendency1()

    {

        DataTable dt = getInfo();

        //文件的改变可以使用

        CacheDependency cd = new CacheDependency(Server.MapPath("TextFile.txt"));

        Cache.Insert("Data", dt, cd);

    }

    private void SqlDependency()

    {

        string dbname = "test";    //注意，数据库必须在web.config中做相应的配置 

        string tblname = "A";

        //启用指定数据库，数据表的缓存依赖 

        SqlCacheDependencyAdmin.EnableTableForNotifications(connstr, tblname);

        SqlCacheDependency scd = new SqlCacheDependency(dbname, tblname);

        DataTable dt = getInfo();

        Cache.Insert("Data", dt, scd);

    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        //-------------------文件依赖缓存--------------------- 

        FileDEpendency1();

    }

 

    protected void Button2_Click(object sender, EventArgs e)

    {

        //-------------MSSQL数据库依赖缓存-------------------- 

        SqlDependency();

    }

  

    protected void Button3_Click(object sender, EventArgs e)

    {

        //-------------显示数据----------- 

        if (Cache.Get("Data") != null)

        {

            DataTable dt = Cache.Get("Data") as DataTable;

            GridView1.DataSource = dt;

            GridView1.DataBind();

            Label1.Text = "来自缓存";

        }

        else

        {

            //缓存过期 

           

            Label1.Text = "缓存过期";

        }

    }

  

}

 

 

 

web.config:
 

  <connectionStrings>

    <add name ="testconnection" connectionString ="server=.;dataBase=test;uid=hm;password=123456"/>

  </connectionStrings>

  <system.web>

    <caching >

      <sqlCacheDependency >

        <databases >

          <add name="test" connectionStringName="testconnection"/>

        </databases>

      </sqlCacheDependency>

    </caching>

  </system.web>

 

 

下载地址： http://download.csdn.net/detail/sgear/3982004