C#实现通过HttpWebRequest发送POST请求实现网站自动登陆

如某个页面有个如下的表单(Form):

< formname = " form1 " action = " http://www.breakn.com/login.asp " method = " post " >
< inputtype = " text " name = " userid " value = "" >
< inputtype = " password " name = " password " value = "" >
</ form >

从表单可看到表单有两个表单域,一个是userid另一个是password,所以以POST形式提交的数据应该包含有这两项。
其中POST的数据格式为:
表单域名称1
= 值1 & 表单域名称2 = 值2 & 表单域名称3 = 值3……
要注意的是“值”必须是经过HTMLEncode的,即不能包含“
<>=& ”这些符号。

本例子要提交的数据应该是:
userid
= value1 & password = value2

用C#写提交程序:
string strId = " guest " ;
string strPassword = " 123456 " ;

ASCIIEncodingencoding
= new ASCIIEncoding();
string postData = " userid= " + strId;
postData
+= ( " &password= " + strPassword);

byte []data = encoding.GetBytes(postData);

// Preparewebrequest
HttpWebRequestmyRequest =
(HttpWebRequest)WebRequest.Create(
" http://www.here.com/login.asp " );

myRequest.Method
= " POST " ;
myRequest.ContentType
= " application/x-www-form-urlencoded " ;
myRequest.ContentLength
= data.Length;
StreamnewStream
= myRequest.GetRequestStream();

// Sendthedata.
newStream.Write(data, 0 ,data.Length);
newStream.Close();

// Getresponse
HttpWebResponsemyResponse = (HttpWebResponse)myRequest.GetResponse();
StreamReaderreader
= new StreamReader(response.GetResponseStream(),Encoding.Default);
string content = reader.ReadToEnd();
Response.Write(content);

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