生成的html内容
<body>
<form method="post" action="./Login.aspx" id="form1">
<div class="aspNetHidden">
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" name="__VIEWSTATE" id="__VIEWSTATE" value="/wEPDwUKMTE3NTYyOTE3Ng9kFgICAQ9kFgICBQ8PZBYCHgdvbmNsaWNrBS50aGlzLmRpc2FibGVkPXRydWU7X19kb1Bvc3RCYWNrKCdidG5Mb2dpbicsJycpZGTYVIQduJiktQAsjmET0WpCKVEwoSyPSdqBY5R5rDqlKA==" />
</div> <script type="text/javascript">
//<![CDATA[
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> <div class="aspNetHidden"> <input type="hidden" name="__VIEWSTATEGENERATOR" id="__VIEWSTATEGENERATOR" value="82312306" />
<input type="hidden" name="__EVENTVALIDATION" id="__EVENTVALIDATION" value="/wEdAASgOrQ71iMnYy6bc/2yqhwyR1LBKX1P1xh290RQyTesRe73C5Hghb+Z/bZTMreJjC6inihG6d/Xh3PZm3b5AoMQw8nbR9PLyUvJjDo4AdVamTiJMoO8PpF19MUnfVREfjA=" />
</div>
<div class="top_div" style="text-align:center;"></div>
<div style="background: rgb(255, 255, 255); margin: -100px auto auto; border: 1px solid rgb(231, 231, 231); border-image: none; width: 400px; height: 230px; text-align: center;">
<div style="width: 165px; height: 96px; position: absolute;">
<div class="tou"></div>
<div class="initial_left_hand" id="left_hand"></div>
<div class="initial_right_hand" id="right_hand"></div>
</div>
<P style="padding: 30px 0px 10px; position: relative;">
<span class="u_logo"></span>
<input name="UserName" type="text" id="UserName" class="ipt" placeholder="请输入用户名" />
</P>
<P style="position: relative;">
<span class="p_logo"></span>
<input name="UserPass" type="password" id="UserPass" class="ipt" placeholder="请输入密码" />
</P>
<div style="height: 50px; line-height: 50px; margin-top: 30px; border-top-color: rgb(231, 231, 231); border-top-width: 0px; border-top-style: solid;">
<P style="margin: 0px 35px 20px 45px;">
<input type="submit" name="btnLogin" value="登录" onclick="this.disabled=true;__doPostBack('btnLogin','');" id="btnLogin" style="height:28px;width:60px;" />
</P>
</div>
<div style="height: 20px; line-height: 20px; margin-top: 0px; border-top-color: rgb(231, 231, 231); border-top-width: 0px; border-top-style: solid;">
<span id="lblMsg" style="color:Red;background-color:Transparent;"></span>
</div>
</div>
<div style="text-align:center;"></div>
</form>
</body>
</html>
上面二行加粗的是必带的viewstatus属性
下面是模拟请求的代码
string strViewState = System.Web.HttpUtility.UrlEncode("/wEPDwUKMTE3NTYyOTE3Ng9kFgICAQ9kFgICBQ8PZBYCHgdvbmNsaWNrBS50aGlzLmRpc2FibGVkPXRydWU7X19kb1Bvc3RCYWNrKCdidG5Mb2dpbicsJycpZGTYVIQduJiktQAsjmET0WpCKVEwoSyPSdqBY5R5rDqlKA==");
string strEventValidation = System.Web.HttpUtility.UrlEncode("/wEdAASgOrQ71iMnYy6bc/2yqhwyR1LBKX1P1xh290RQyTesRe73C5Hghb+Z/bZTMreJjC6inihG6d/Xh3PZm3b5AoMQw8nbR9PLyUvJjDo4AdVamTiJMoO8PpF19MUnfVREfjA=");
StringBuilder url = new StringBuilder();
url.Append("UserPass=123456");
url.Append("&UserName=whtydn");
url.Append("&UserName=whtydn");
url.Append("&__VIEWSTATE="+ strViewState);
url.Append("&__EVENTVALIDATION=" + strEventValidation);
url.Append("&btnLogin=登录");
byte[] data = System.Text.Encoding.ASCII.GetBytes(url.ToString());
Uri uri = new Uri("http://www.etaor.com/Admin/Login.aspx");
System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
request.Method = "post";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(data, , data.Length);
requestStream.Close();
System.Net.HttpWebResponse response = (System.Net.HttpWebResponse)request.GetResponse();
Stream responseStream = response.GetResponseStream();
StreamReader readStream = new StreamReader(responseStream, System.Text.Encoding.UTF8);
string retext = readStream.ReadToEnd().ToString();
readStream.Close();
Console.WriteLine("Result: " + retext);