如果向某网址Post信息，并得到CookieContainer以便以后直接通过验证

using system;

using system.net;

using system.io;

using system.text;

[stathread]

static void main(string[] args)

{

//

// todo: 在此处添加代码以启动应用程序

//

string url="http://localhost/csdn2/1.asp";

//

string indata="aa=zhuye";

string outdata="";

cookiecontainer mycookiecontainer=new cookiecontainer();

//新建一个cookiecontainer来存放cookie集合

httpwebrequest myhttpwebrequest=(httpwebrequest)webrequest.create(url);

//新建一个httpwebrequest

myhttpwebrequest.contenttype="application/x-www-form-urlencoded";

myhttpwebrequest.contentlength=indata.length;

myhttpwebrequest.method="post";

myhttpwebrequest.cookiecontainer=mycookiecontainer;

//设置httpwebrequest的cookiecontainer为刚才建立的那个mycookiecontainer

stream myrequeststream=myhttpwebrequest.getrequeststream();

streamwriter mystreamwriter=new streamwriter(myrequeststream,encoding.getencoding("gb2312"));

mystreamwriter.write(indata);

//把数据写入httpwebrequest的request流

mystreamwriter.close();

myrequeststream.close();

//关闭打开对象

httpwebresponse myhttpwebresponse=(httpwebresponse)myhttpwebrequest.getresponse();

//新建一个httpwebresponse

myhttpwebresponse.cookies=mycookiecontainer.getcookies(myhttpwebrequest.requesturi);

//获取一个包含url的cookie集合的cookiecollection

stream myresponsestream=myhttpwebresponse.getresponsestream();

streamreader mystreamreader=new streamreader(myresponsestream,encoding.getencoding("gb2312"));

outdata=mystreamreader.readtoend();

//把数据从httpwebresponse的response流中读出

mystreamreader.close();

myresponsestream.close();

console.writeline(outdata);

//显示"登录"

//拿到了cookie，再进行请求就能直接读取到登录后的内容了

myhttpwebrequest=(httpwebrequest)webrequest.create(url);

myhttpwebrequest.cookiecontainer=mycookiecontainer;//*

//刚才那个cookiecontainer已经存有了cookie,把它附加到httpwebrequest中则能直接通过验证

myhttpwebresponse=(httpwebresponse)myhttpwebrequest.getresponse();

myhttpwebresponse.cookies=mycookiecontainer.getcookies(myhttpwebrequest.requesturi);

myresponsestream=myhttpwebresponse.getresponsestream();

mystreamreader=new streamreader(myresponsestream,encoding.getencoding("gb2312"));

outdata=mystreamreader.readtoend();

mystreamreader.close();

myresponsestream.close();

console.writeline(outdata);

//再次显示"登录"

//如果把*行注释调，就显示"没有登录"

}