<% @ Page Language = " C# " %> <! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" > < script runat ="server" >     System.Data.DataView CreateDataSourceByXianhuiMeng()   {     System.Data.DataTable dt = new System.Data.DataTable();     System.Data.DataRow dr;     dt.Columns.Add( new System.Data.DataColumn( " id " , typeof (System.Int32)));     dt.Columns.Add( new System.Data.DataColumn( " 学生姓名 " , typeof (System.String)));     dt.Columns.Add( new System.Data.DataColumn( " 语文 " , typeof (System.Decimal)));     dt.Columns.Add( new System.Data.DataColumn( " 数学 " , typeof (System.Decimal)));     dt.Columns.Add( new System.Data.DataColumn( " 英语 " , typeof (System.Decimal)));     dt.Columns.Add( new System.Data.DataColumn( " 计算机 " , typeof (System.Decimal)));      for ( int i = 1 ; i < 30 ; i ++ )     {       System.Random rd = new System.Random(Environment.TickCount * i); ;       dr = dt.NewRow();       dr[ 0 ] = i;       dr[ 1 ] = " 【孟子E章】 " + i.ToString();       dr[ 2 ] = System.Math.Round(rd.NextDouble() * 100 , 2 );       dr[ 3 ] = System.Math.Round(rd.NextDouble() * 100 , 2 );       dr[ 4 ] = System.Math.Round(rd.NextDouble() * 100 , 2 );       dr[ 5 ] = System.Math.Round(rd.NextDouble() * 100 , 2 );       dt.Rows.Add(dr);     }     System.Data.DataView dv = new System.Data.DataView(dt);      return dv;   }   protected void Page_Load(object sender, EventArgs e)   {      if (Request.QueryString[ " id " ] != null )     {       Response.ClearContent();       GridView1.DataSource = CreateDataSourceByXianhuiMeng();       GridView1.DataBind();       System.Text.StringBuilder sb = new System.Text.StringBuilder();       System.IO.StringWriter sw = new System.IO.StringWriter(sb);       HtmlTextWriter htw = new HtmlTextWriter(sw);       Literal header = new Literal();       header.Text = " <h2>项目 " + Request.QueryString[ " id " ] + " </h2> " ;       Header.Controls.Add(header);       Header.RenderControl(htw);       GridView1.RenderControl(htw);       Response.Write( " 这里查询数据，输出结果就可以了。结果： " + sb.ToString());       Response.End();     }   }    // / 添加这个override void VerifyRenderingInServerForm(Control control)，是为了避免出现    // / 类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内。    // / 的异常   public override void VerifyRenderingInServerForm(Control control)   { } </ script > < html xmlns ="http://www.w3.org/1999/xhtml" > < head id ="Head1" runat ="server" >    < title > 使用 AJAX，局部刷新 GridView 进行数据绑定的简单实现 </ title >    < script type ="text/javascript" >      function GetData(p) {       document.getElementById( " d " ).innerHTML = " 正在读取数据…… " ;       h = window.XMLHttpRequest ? new window.XMLHttpRequest() : new ActiveXObject( " MSXML2.XMLHTTP " );       h.open( " GET " , ' <%=Request.FilePath %>?id= ' + p.value, true );       h.onreadystatechange = function () {          if (h.readyState == 4 ) {            if (h.status >= 200 && h.status < 300 ) {             document.getElementById( " d " ).innerHTML = h.responseText;           }            else {             document.getElementById( " d " ).innerHTML = " <h2>数据操作错误：</h2> " + h.responseText;           }         }       }       h.send( null );     }     alert( " 这个提示，只出现在第一次打开页面。 " );    </ script > </ head > < body >    < form id ="form1" runat ="server" >    < asp:GridView ID ="GridView1" runat ="server" ></ asp:GridView >    < asp:Panel ID ="Header" runat ="server" ></ asp:Panel >    < select onchange ="GetData(this)" >      < option value ="1" > 项目一 </ option >      < option value ="2" > 项目二 </ option >    </ select >    </ form >    < div id ="d" ></ div > </ body > </ html >