asp.net+Ajax 文本文件静态分页实现代码

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>