在使用分页和JavaScript链接时，如何从ASP.NET网站上删除信息？
[英]How do I scrape information off ASP.NET websites when paging and JavaScript links are being used?
问题描述
I have been given a staff list which is supposed to be up to date but it doesn't match an intranet People Finder which is written in ASP.NET. 
我得到了一个应该是最新的工作人员列表，但它与用ASP.NET编写的Intranet People Finder不匹配。
As the information is sensitive I am not able to access the database the People Finder is using so the only way I can get at the information is by scraping the structure starting at the top brass at the top and then going through each tier in turn. 由于信息敏感，我无法访问People Finder正在使用的数据库，因此我可以获取信息的唯一方法是从顶部的顶部黄铜开始刮取结构，然后依次遍历每个层。
Each person has a Staff number which then forms the URL http://intranet/peoplefinder/index.aspx?srn=ABC1234 and then all the people who report to them are listed underneth in the format <a id="gvEmployees_ctl03_lnkFullName" href="index.aspx?srn=ABC4321" target="_self"> where each URL indicates the Staff number and provides a link to their team. 每个人都有一个员工编号，然后形成URL http://intranet/peoplefinder/index.aspx?srn=ABC1234 ，然后所有向他们报告的人都以<a id="gvEmployees_ctl03_lnkFullName" href="index.aspx?srn=ABC4321" target="_self">格式列出。 <a id="gvEmployees_ctl03_lnkFullName" href="index.aspx?srn=ABC4321" target="_self">其中每个URL指示员工编号并提供其团队的链接。
The trouble arises when the teams are big as paging is implemented in the GridView with an URL such as <a href="javascript:__doPostBack('gvEmployees','Page$2')">2</a> . 当团队很大时会出现问题，因为在GridView中使用诸如<a href="javascript:__doPostBack('gvEmployees','Page$2')">2</a>类的URL实现分页。
How would I scrape this page, capture the SRN and other details along with the people who report to the person on all pages of the GridView then loop through each reportee and do the same process until the whole list is complete? 我如何抓取此页面，捕获SRN和其他详细信息以及在GridView的所有页面上向此人报告的人然后循环遍历每个报表并执行相同的过程，直到整个列表完成？
Example HTML of result 结果的示例HTML
<!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><title>
People Finder: Name Surname
</title><link rel="stylesheet" href="/path/to/style.css" type="text/css" /><link rel="stylesheet" href="/path/to/anotherStyle.css" type="text/css" />
<script type="text/javascript" src="/path/to/peoplefinder.js"></script>
</head>
<body>
<form name="form1" method="post" action="/path/to/index.aspx" id="form1">
<div>
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="### ViewState ###" />
</div>
<script type="text/javascript">
<!--
var theForm = document.forms['form1'];
if (!theForm) {
theForm = document.form1;
}
function __doPostBack(eventTarget, eventArgument) {
if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
theForm.__EVENTTARGET.value = eventTarget;
theForm.__EVENTARGUMENT.value = eventArgument;
theForm.submit();
}
}
// -->
</script>
<script src="/path/to/WebResource.axd?d=AueXWrgAf8xSxMTAt1Q4AA2&t=633311832634916698" type="text/javascript"></script>
<div class="HP3CHeader">
<div id="LWHPBanner">
<h1><span id="lblName">Name Surname</span></h1>
</div>
</div>
<div id='CPMain'>
<div id="mainBox">
<div id="pnlEmployeeDetails">
<div id='basicData'>
<img id="imgPhoto" class="photo" src="/path/to/photo.jpg" style="height:69px;width:69px;border-width:0px;" />
<span id="lblBusinessUnit">Business Unit</span>
<span id="lblCostCentreName">Cost Centre</span>
<span id="lblLocation">Location</span>
<a href='/path/to/checkcontactdetails.htm' target='_blank' onclick='return OpenCheckContactDetails();' >Find out how to change your details/photo.</a>
<div id="manager">
<strong>Reports to: </strong><a id="hlManager" href="/path/to/index.aspx?srn=ABC1234">Name Surname</a>
</div>
</div>
<div id='contactData'>
<div id="pnlSrn">
<strong>Staff number:</strong> <span id="lblSrn">ABC1234</span>
</div>
<div id="pnlEmailAddress">
<strong>Email Address:</strong> <span id="lblEmailAddress">Email</span>
</div>
<div style="clear: both"></div>
</div>
</div>
<div id="pnlGrid">
<h3><span id="lblGridTitle">Name's team</span></h3>
<div>
<table class="subordinates" cellspacing="0" cellpadding="2" rules="cols" border="1" id="gvEmployees" style="border-style:None;border-collapse:collapse;">
<tr style="color:Black;background-color:#EFF3FB;border-style:None;font-weight:bold;">
<th scope="col"><a href="javascript:__doPostBack('gvEmployees','Sort$SRN')" style="color:Black;">SRN</a></th><th scope="col"><a href="javascript:__doPostBack('gvEmployees','Sort$FullName')" style="color:Black;">Full name</a></th><th scope="col"><a href="javascript:__doPostBack('gvEmployees','Sort$RACFID')" style="color:Black;">RACFID</a></th>
</tr><tr class="reports" style="background-color:White;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl02_lnkFullName" href="index.aspx?srn=1K5932" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="reports" style="background-color:#EFF3FB;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl03_lnkFullName" href="/path/to/index.aspx?srn=ABC1234" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="reports" style="background-color:White;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl04_lnkFullName" href="/path/to/index.aspx?srn=ABC1234" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="reports" style="background-color:#EFF3FB;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl05_lnkFullName" href="/path/to/index.aspx?srn=ABC1234" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="reports" style="background-color:White;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl06_lnkFullName" href="/path/to/index.aspx?srn=ABC1234" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="reports" style="background-color:#EFF3FB;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl07_lnkFullName" href="/path/to/index.aspx?srn=ABC1234" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="reports" style="background-color:White;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl08_lnkFullName" href="/path/to/index.aspx?srn=ABC1234" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="reports" style="background-color:#EFF3FB;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl09_lnkFullName" href="/path/to/index.aspx?srn=ABC1234" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="reports" style="background-color:White;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl10_lnkFullName" href="/path/to/index.aspx?srn=ABC1234" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="reports" style="background-color:#EFF3FB;border-style:None;">
<td style="width:70px;">ABC1234</td><td>
<a id="gvEmployees_ctl11_lnkFullName" href="/path/to/index.aspx?srn=ABC1234" target="_self">Name Surname</a>
</td><td>ABCD</td>
</tr><tr class="PagerStyle" style="color:#000039;border-style:None;">
<td colspan="3"><table border="0">
<tr>
<td><span>1</span></td><td><a href="javascript:__doPostBack('gvEmployees','Page$2')" style="color:#000039;">2</a></td>
</tr>
</table></td>
</tr>
</table>
</div>
</div>
</div>
<div id="searchBox">
<strong>Search People Finder:</strong>
<br /><br />
<span>Forename:</span><br/>
<span><input name="txtFirstname" type="text" id="txtFirstname" /></span><br/>
<span>Surname:</span><br/>
<span><input name="txtSurname" type="text" id="txtSurname" /></span><br/>
<span>RACFID:</span><br/>
<span><input name="txtRacfid" type="text" id="txtRacfid" /></span><br/>
<span>Staff number:</span><br/>
<span><input name="txtSrn" type="text" id="txtSrn" /></span><br/>
<div class="searchBoxItem" style="text-align:center;width:100%"><input type="submit" name="btnFind" value="Search" onclick="javascript:WebForm_DoPostBackWithOptions(new WebForm_PostBackOptions("btnFind", "", false, "", "index.aspx", false, false))" id="btnFind" title="Search for employees member" class="button" style="border-style:Outset;" /></div><br/>
<div>People Finder searches only UK staff.</div>
<!-- <div><a class="execBoardLink" href="/path/to/index.aspx?srn=ABC1234">Show Executive Board</a></div> -->
<div style="margin-top:5px;"><a href="/path/to/phonebook" target="phoneBook" onclick='return OpenPhonebook();' title="Open Phonebook in new window">Open Phonebook</a></div>
</div>
</div>
<div class="contentFooter" style="text-align:center;">
<table width="100%" cellpadding="0" cellspacing="0" border="0" summary="Navigation layout table">
<tr>
<td align="left"><span class="linkArrow"><</span> <a href="javascript:history.back();">Back</a></td>
<td align="center"></td>
<td align="right"><span class="linkArrow">^ </span><a href="#top">Top</a></td>
</tr>
</table>
</div>
<div>
<input type="hidden" name="__PREVIOUSPAGE" id="__PREVIOUSPAGE" value="vy066Txz34y1E515UsTSTDabHKEmdBRCsq7xM0lpJls1" />
<input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEWCgKM3uTTAgLP/83pDwLfwaTTAQKNguzjCAKt98LeCwLZh62pDwKKqdGpBwLd2q7jAwKa+5aMBAL5zb65C42zY4GBEUKujhjtZ/hZ8sLESfiF" />
</div></form>
</body>
</html>
2 个解决方案
解决方案1
3 已采纳 2010-03-15 18:30:08
You could post a variable to the HTML page to go through the paging. 您可以将变量发布到HTML页面以进行分页。
string lcUrl = "http://www.mysite.com/page.aspx";
HttpWebRequest loHttp =
(HttpWebRequest) WebRequest.Create(lcUrl);
// *** Send any POST data
string lcPostData =
"gvEmployees=" + HttpUtility.UrlEncode("Page$2");
loHttp.Method="POST";
byte [] lbPostBuffer = System.Text.
Encoding.GetEncoding(1252).GetBytes(lcPostData);
loHttp.ContentLength = lbPostBuffer.Length;
Stream loPostData = loHttp.GetRequestStream();
loPostData.Write(lbPostBuffer,0,lbPostBuffer.Length);
loPostData.Close();
HttpWebResponse loWebResponse = (HttpWebResponse) loHttp.GetResponse();
Encoding enc = System.Text.Encoding.GetEncoding(1252);
StreamReader loResponseStream =
new StreamReader(loWebResponse.GetResponseStream(),enc);
string lcHtml = loResponseStream.ReadToEnd();
loWebResponse.Close();
loResponseStream.Close();
Then parse out the data you need from the string. 然后从字符串中解析出您需要的数据。
--EDIT-- - 编辑 -
Here is what I would try (something similar) where all of the post data is sent: 以下是我将尝试（类似的）发送所有发布数据的内容：
string lcPostData =
"__EVENTTARGET" + HttpUtility.UrlEncode("gvEmployees"); &
"__EVENTARGUMENT" + HttpUtility.UrlEncode("Page%242"); &
"__VIEWSTATE" + HttpUtility.UrlEncode("<Value of _Viewstate>");
解决方案2
1 2018-02-01 12:15:05
You open the fiddler and open the second page of asp.net website table.Go to webforms tab in Fiddler for that particular page session and check in the body what are the variables are posting.Concat all variables in same sequence format and post data using HttpWebRequest. 你打开小提琴手，打开asp.net网站表的第二页。转到Fiddler的webforms选项卡进行特定的页面会话，并检查正文中有哪些变量发布。使用相同的序列格式控制所有变量并使用相应的方式发布数据HttpWebRequest的。 In my case it was: 在我的情况下它是：
string PostData = "__EVENTTARGET="
+ HttpUtility.UrlEncode("ctl00$ContentPlaceHolder2$grdDirectory")
+ "&"
+ "__EVENTARGUMENT="+HttpUtility.UrlEncode("Page$2")
+ "&"
+ "__VIEWSTATE="+ HttpUtility.UrlEncode(view_state)
+ "&"
+ "__VIEWSTATEGENERATOR="
+ HttpUtility.UrlEncode(viewstategenerator)
+ "&"
+ "__VIEWSTATEENCRYPTED="
+ HttpUtility.UrlEncode(viewstateencrypted)
+ "&"
+ "__EVENTVALIDATION=" + HttpUtility.UrlEncode(eventvalidation);
Hope It will work. 希望它会奏效。
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