DataReader结合aspnetpager分页

以前一直使用DataTable与aspnetpager结合实现分页，今天测试一下DataReader
前台

代码

<% @ Page Language = " C# "  AutoEventWireup = " true "  CodeFile = " CountRecordList.aspx.cs "  Inherits = " Office_CountRecordList "   %>
<% @ Register Assembly = " AspNetPager "  Namespace = " Wuqi.Webdiyer "  TagPrefix = " webdiyer "   %>  
<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

< html  xmlns ="http://www.w3.org/1999/xhtml"   >
< head  runat ="server" >
     < title > DataReader结合aspnetpager分页 </ title >
</ head >
< body >
     < form  id ="form1"  runat ="server" >
< div >
< table  cellpadding ="0"  cellspacing ="1" >
     < tr  class ="meet_title bold" >
         < td > 用户单位 </ td >
     </ tr >
     < asp:Repeater  ID ="rptList"  runat ="server"  OnItemCommand ="rptList_ItemCommand" >
     < ItemTemplate >
     < tr  style ='background-color:<%#(Container.ItemIndex%2==0)?"#fff":"#eee"% > ' class="meet_tr" onmouseover="fOver(this);" onmouseout="fOut(this);">
         < td  style ="height:30px;" >< a  href ='CountRecord.aspx?rid=<%#Eval("PID")  % > '> <% # Eval ( " UnitName " ) %> </ a ></ td >
     </ tr >
     </ ItemTemplate >
     </ asp:Repeater >
     < tr >
         < td >
             < webdiyer:aspnetpager  ID ="AspNetPager1"  runat ="server"  PageSize ="20"  OnPageChanged ="AspNetPager1_PageChanged"  
    AlwaysShow ="True"  CustomInfoHTML ="　当前第 <span style='color:red;'>%CurrentPageIndex%</span> 页，共 %PageCount%页"  
    FirstPageText ="首页"  LastPageText ="尾页"  NextPageText ="下一页"  PrevPageText ="上一页"  
    ShowCustomInfoSection ="Right"  Width ="100%"  BorderColor ="#999999"   CssClass ="anpager" >   
     </ webdiyer:aspnetpager >  
         </ td >
     </ tr >
</ table >
</ div >
     </ form >
</ body >
</ html >

 

后台

代码

protected   void  Page_Load( object  sender, EventArgs e)
{
     if  ( ! IsPostBack)
    {
        AspNetPager1.RecordCount  =  Convert.ToInt32(getTotal());
        Bind();
    }
}
private   void  Bind()
{
    IDataReader dr  =  getPagesData(Convert.ToInt32(AspNetPager1.PageSize), AspNetPager1.CurrentPageIndex  -   1 );
    rptList.DataSource  =  dr;
    rptList.DataBind();
    dr.Close();
}

///   <summary>
///  取得总数
///   </summary>
///   <returns></returns>
public   string  getTotal()
{
     return  LocalPub.ExecuteScalar( " select count(*) as total from  "   +  LocalPub.DBPrefix.Office  +   " t_CountRecord " ).ToString();
}
///   <summary>
///  根据当前页码，每页条数，取得相应数据。
///   </summary>
///   <param name="pageNum"> 每页显示条数 </param>
///   <param name="currentPage"> 当前页码 </param>
///   <returns></returns>
public  IDataReader getPagesData( int  pageNum,  int  currentPage)
{
    StringBuilder sb  =   new  StringBuilder();
    sb.Append( " select top  "   +  pageNum  +   "  * from t_CountRecord  " );
     if  (currentPage  >   0 )
        sb.Append( "  where PID not in (select top  "   +  pageNum  *  currentPage  +   "  PID from t_CountRecord order by PID desc) " );
    sb.Append( "  order by PID desc " );

     return  LocalPub.ExecuteReader(sb.ToString());
}
protected   void  AspNetPager1_PageChanged( object  sender, EventArgs e)
{
    Bind();
}