ASP.Net使用缓存技术提高效率

　　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();
  }