请教一下大侠：我想通过程序来自动发一个HttpWebRequest来抓取搜索结果，搜索结果是分页显示的，需要模拟__doPostBack(eventTarget, eventArgument)
我的环境是英文，以下的代码可以“工作”，不过不是正常工作，我是想模拟点击了第3页，可是返回的结果还是第1页，不知是什么原因？
Dim bt() As Byte
Dim para As String
'Here is the parameters that are passed to the page
para = "__EVENTTARGET=ctl00$ContentPlaceHolder1$AspNetPager1&__EVENTARGUMENT=3"
r.Method = "Post"
r.AllowWriteStreamBuffering = True
bt = System.Text.Encoding.ASCII.GetBytes(para)
r.ContentLength = bt.Length
r.UserAgent = "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"
r.KeepAlive = False
Dim strResult As String
Dim s As Stream = r.GetRequestStream()
s.Write(bt, 0, bt.Length)
s.Close()
Dim wres As WebResponse
Try
wres = r.GetResponse
Dim sr As StreamReader
sr = New StreamReader(wres.GetResponseStream(), True)
strResult = sr.ReadToEnd
Catch ex As Exception
Throw ex
End Try
另外，我把页面的源码贴在这里：
<body>
<form name="aspnetForm" method="post" action="search.aspx?a5000zzzz" onsubmit="javascript:return WebForm_OnSubmit();" id="aspnetForm">
<div>
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__LASTFOCUS" id="__LASTFOCUS" value="" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="。。。。。。非常长的一个viewstate" />
</div>
<script type="text/javascript">
// <![CDATA[
var theForm = document.forms['aspnetForm'];
if (!theForm) {
theForm = document.aspnetForm;
}
function __doPostBack(eventTarget, eventArgument) {
if (!theForm.onsubmit || (theForm.onsubmit() != false)) {
theForm.__EVENTTARGET.value = eventTarget;
theForm.__EVENTARGUMENT.value = eventArgument;
theForm.submit();
}
}
//]]>
</script>
。。。。。。
我试图传递过去的是__EVENTTARGET和__EVENTARGUMENT
谢谢。
