ASP.Net使用缓存技术提高效率

3/26/2006来源:ASP.NET技巧人气:11754

asp.net的缓存技术大大地提高了效率,本人将代码的简单的实现代码贴出:

一、在页面中显示时,读缓存数据,加载xml数据

public void LoadData()
  {
   DataView Source = (DataView)Cache["MyData"];
   if(Source == null)
   {
    DataSet ds = new DataSet();
    FileStream fs = new FileStream(Server.MapPath("LoginMsg.xml"), FileMode.Open,Fileaccess.Read);
    StreamReader reader = new StreamReader(fs);
    ds.ReadXml(reader);
    fs.Close();
    Source = new DataView(ds.Tables[0]);
    Cache.Insert("MyData", Source, new CacheDependency(Server.MapPath("LoginMsg.xml")));
    ErrorMsg.Text = "从文件中读取的数据";
   }
   else
   {
    ErrorMsg.Text = "从缓存中读取的数据";
   }
   MyDataGrid.DataSource = Source;
   MyDataGrid.DataBind();
  }

 

二、用XML存储交互数据,将数据放置到缓存中

PRivate void LoginMsg_Click(object sender, System.EventArgs e)
  {
   if(!Page.IsValid)
   {
    ErrorMsg.Text = "必需输入登录信息";
    return;
   }
   DataSet ds = new DataSet();
   FileStream fs = new FileStream(Server.MapPath("LoginMsg.xml"),FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
   StreamReader reader = new StreamReader(fs);
   ds.ReadXml(reader);
   fs.Close();
   DataTable dt = ds.Tables[0];
   DataRow newrow = dt.NewRow();
   newrow["custom_email"] = CustomEamil.Text;
   newrow["custom_pass"] = CustomPass.Text;
   newrow["login_time"] = DateTime.Now.ToString();
   fs = new FileStream(Server.MapPath("LoginMsg.xml"), FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite);
   TextWriter writer = new StreamWriter(fs);
   writer = TextWriter.Synchronized(writer);
   ds.Tables[0].Rows.Add(newrow);
   ds.WriteXml(writer);
   writer.Close();
   Cache.Remove("MyData");
   LoadData();

  }