using  System;
using  System.Collections.Generic;
using  System.Text;
using  System.IO;

namespace  Txt
{

public   class  TxtPager
    {
         public  TxtPager()
        { }
         public  TxtPager( string  _txtPath,  int  _Pagesize)
        {
            {
                 this .txtPath  =  _txtPath;
                 this .pageSize  =  _Pagesize;
            }
        }
         string  txtPath; // 文件路径
         int  pageSize; // 每页文本行数
        //  int ppt; //
         int  number;
        //  int totalPage;
  #region
         public   int  TotalPage
        {
             get  {
                 if  (TxtLineCount()  %  pageSize  ==   0 )
                     return  TxtLineCount()  /  pageSize;
                 else
                 return  TxtLineCount() / pageSize  +   1 ; }
        }

public   int  Ppt
        {
             get  {  return  TxtLineCount(); }
        }
         public   int  Number
        {
             get  {  return  number; }
             set  { number  =  value; }
        }
#endregion
         private   int  TxtLineCount()
        {
            StreamReader sr  =   new  StreamReader( this .txtPath);
             string  line;
             int  count  =   0 ;
             while  ((line  =  sr.ReadLine())  !=   null )
            {
                 // line += "fuck";
                count ++ ;
            }
             return  count;
        }
         public   string  ReadTxtToHtml()
        {
             string  line; // 存放一行文字
             int  ptr  =   0 ; // 行计数
             int  ttp  =   1 ; // 分页后的最大页数
            StreamReader sr  =   new  StreamReader(txtPath);
             string  htmlStr  =   "" ; // 用于存放Html代码
            htmlStr  +=   " # "   +  ttp  +   " </br> " ;
             while  ((line  =  sr.ReadLine())  !=   null )
            {
                 if  (ptr  ==  pageSize)
                {
                    ttp ++ ;
                    htmlStr  +=   " # "   +  ttp  +   " </br> " ;
                    ttp ++ ;
                    htmlStr  +=   " # "   +  ttp  +   " </br> " ;
                    ptr  =   0 ;
                }
                htmlStr  +=  line  +   " </br> " ;
                ptr ++ ;
            }
            htmlStr  +=   " # "   +  (ttp  +   1 ) ;
             // return htmlStr;
             if  (number  >  ttp + 1 / 2 )
            {
                number  =  ttp;
            }
             // .................................
             string  startStr  =   " # "   +  ( 2   *  number  -   1 ); // 1
             string  endStr  =   " # "   +  ( 2   *  number); // 2    1---2
             int  startNum  =  htmlStr.IndexOf(startStr);
             int  endNum  =  htmlStr.IndexOf(endStr);
             int  offset  =  startStr.Length;
             return  htmlStr.Substring(startNum  +  offset, endNum  -  (startNum  +  offset));
        }
    }
}

public   partial   class  TxtPager : System.Web.UI.Page
{
     protected   void  Page_Load( object  sender, EventArgs e)
    {
         int  pageSize  =   40 ;
         string  _path  =  rtPath( int .Parse(Request.QueryString[ " txtid " ]));
         string  path  =  HttpContext.Current.Server.MapPath(_path);
        Txt.TxtPager tp  =   new  Txt.TxtPager(path, pageSize);
         int  _ttpage  =  tp.TotalPage;
         if  (Request.RequestType.ToString().ToLower()  ==   " get " )
        {
            Response.Write(_ttpage.ToString());
            Response.End();
        }
         if  (Request.RequestType.ToLower()  ==   " post " )
        {
           
             // string = 
             // 前端判断 index 是否为数字
             string  index  =  Request.QueryString[ " index " ];
            tp.Number  =   int .Parse(index);
             string  context  =  tp.ReadTxtToHtml();
            Response.Write(context);
            Response.End();
        }
    }
     private   string  rtPath( int  i)
    {
         string [] pathCollection  =  {  " Test.txt "  , " tdays.txt " , " problem.txt " , " jion.txt " , " serve.txt " , " project.txt " , " icexplain.txt " };
         return   " txt/ "   +  pathCollection[i];
    }
}

< script type = " text/javascript "  language = " javascript " >
var  xmlhttp;
var  pxmlhttp;
var  TotilPage;
var  ContectBody;
function  GetXmlHttpRequset()
{
     var  rtxmlHttp;
     try
    { rtxmlHttp  =   new  XmlHttpRequset();}
     catch (e)
    {
         try
        { 
        rtxmlHttp  =   new  ActiveXObject( " Mxxml2.XMLHTTP " );
        }
         catch (e)
        {   
             try { rtxmlHttp  =   new  ActiveXObject( " Microsoft.XMLHTTP " );}
             catch (e)
            { alert( " 您的的浏览器不支持Ajax " ); }
        }
    }    
return  rtxmlHttp;
}
function  GetPagerCount()
{
    xmlhttp  =  GetXmlHttpRequset();
     var  url  =   " TxtPager.aspx?txtid=0 " ;
     try
    {
    xmlhttp.open( " get " ,url, false );
    }
     catch (e)
    {  return   false ; }
    xmlhttp.onreadystatechange  =  CountCallBack;
    xmlhttp.send( null );
     return   true ;
}
function  CountCallBack()
{
   if (xmlhttp.readyState  ==   4 )
  {
var  count  =  xmlhttp.responseText;
     var  i  =   0 ;
     for (i = 0  ; i < count ; i ++ )
    {
       var  ChildDiv  =  document.createElement( " div " );
      document.getElementById( " Count1 " ).appendChild( ChildDiv);
      ChildDiv.innerHTML  =  i + 1 ;
      ChildDiv.setAttribute( " id " ,i);
      ChildDiv.setAttribute( " onclick " , " GetHtmlString( " + (i + 1 ) + " ) " );
      GetHtmlString( 1 );
    }
  }
}

function  GetHtmlString(i)
{
    pxmlhttp  =  GetXmlHttpRequset();
     var  Url  =   " TxtPager.aspx?txtid=0&index= " +  i;
    pxmlhttp.open( " post " ,Url, false );
    pxmlhttp.onreadystatechange  =  ContextPostBack ;
    pxmlhttp.send( null );
}

function  ContextPostBack()
{
   if (pxmlhttp.readyState  ==   4 )
  {
    var  context  =  pxmlhttp.responseText;
   document.getElementById( " article " ).innerHTML  =  context;
  } 
}
< / script>

< table width = " 90% "  border = " 0 "  cellspacing = " 0 "  cellpadding = " 0 " >
           < tr >
             < td align = " center " > 冰激凌制作方法大全 < / td>
           < / tr>
           < tr >
             < td id = " article "  align = " left "  style = " font-size:12px; height:805px " > td >
           < / tr>
           < tr >
             < td id = " Count1 "  style = " height:auto; text-align:right " >              < / td>
           < / tr>
         < / table>