以下就分别用这三种方法来实现：
1、WebBrowser是个"迷你"浏览器，其特点是Post时不用关心Cookie、内置JS等问题
WebBrowser是VS2005新提供的组件（其实就是封装了IE接口），实现POST功能一般在webBrowser的DocumentCompleted中分析HtmlDocument 来实现，代码如下：
HtmlElement ClickBtn =null;
if (e.Url.ToString().ToLower().IndexOf("http://sandou.cnblogs.com/") > 0) //登陆页面
{
HtmlDocument doc = webBrowser1.Document;
for (int i = 0; i < doc.All.Count ; i++)
{
if (doc.All[i].TagName.ToUpper().Equals("INPUT"))
{
switch (doc.All[i].Name)
{
case "userCtl":
doc.All[i].InnerText = "user01";
break;
case "passCt1":
doc.All[i].InnerText = "mypass";
break;
case "B1":
ClickBtn = doc.All[i]; //提交按钮
break;
}
}
}
ClickBtn.InvokeMember("Click"); //执行按扭操作
}
2、WebClient封装了HTTP的一些类，操作简单，相较于webBrowser，特点是可以自设代理，缺点是对COOKIE的控制
WebClient的运行全在后台，并且提供了异步操作的能力，这样很方便并发多个任务，然后等待结果的返回，再逐个处理。多任务异步调用的代码如下：
private void StartLoop(int ProxyNum)
{
WebClient [] wcArray = new WebClient[ProxyNum]; //初始化
for (int idArray = 0; idArray< ProxyNum;idArray++)
{
wcArray[idArray] = new WebClient();
wcArray[idArray].OpenReadCompleted += new OpenReadCompletedEventHandler(Pic_OpenReadCompleted2);
wcArray[idArray].UploadDataCompleted += new UploadDataCompletedEventHandler(Pic_UploadDataCompleted2);
try
{
wcArray[idArray].Proxy = new WebProxy(proxy[1], port);
wcArray[idArray].OpenReadAsync(new Uri("http://sandou.cnblogs.com/")); //打开WEB;
proxy = null;
}
catch
{
}
}
}
private void Pic_OpenReadCompleted2(object sender, OpenReadCompletedEventArgs e)
{
if (e.Error == null)
{
string textData = new StreamReader(e.Result, Encoding.Default).ReadToEnd(); //取返回信息
..
String cookie = ((WebClient)sender).ResponseHeaders["Set-Cookie"];
((WebClient)sender).Headers.Add("Content-Type", "application/x-www-form-urlencoded");
((WebClient)sender).Headers.Add("Accept-Language", "zh-cn");
((WebClient)sender).Headers.Add("Cookie", cookie);
string postData = ""
byte[] byteArray = Encoding.UTF8.GetBytes(postData); // 转化成二进制数组
((WebClient)sender).UploadDataAsync(new Uri("http://sandou.cnblogs.com/"), "POST", byteArray);
}
}
private void Pic_UploadDataCompleted2(object sender, UploadDataCompletedEventArgs e)
{
if (e.Error == null)
{
string returnMessage = Encoding.Default.GetString(e.Result);
}
}
3、HttpWebRequest较为低层，能实现的功能较多，Cookie操作也很简单:
private bool PostWebRequest()
{
CookieContainer cc = new CookieContainer();
string pos tData = "user=" + strUser + "&pass=" + strPsd;
byte[] byteArray = Encoding.UTF8.GetBytes(postData); // 转化
HttpWebRequest webRequest2 = (HttpWebRequest)WebRequest.Create(new Uri(http://sandou.cnblogs.com/));
webRequest2.CookieContainer = cc;
webRequest2.Method = "POST";
webRequest2.ContentType = "application/x-www-form-urlencoded";
webRequest2.ContentLength = byteArray.Length;
Stream newStream = webRequest2.GetRequestStream();
// Send the data.
newStream.Write(byteArray, 0, byteArray.Length); //写入参数
newStream.Close();
HttpWebResponse response2 = (HttpWebResponse)webRequest2.GetResponse();
StreamReader sr2=new StreamReader(response2.GetResponseStream(), Encoding.Default);
string text2 = sr2.ReadToEnd();
}
HttpWebRequest 实现， 这个是从网上COPY 的！我以前用相关的代码登录到WWW.ASP.NET上，并且成功post，可惜代码不知道放什么地方了。
HttpWebRequest自动登录网站并获取网站内容（不包含验证码的网站）
可以使用 Visual Sniffer（百度搜索） 来捕捉提交的数据信息：
1. 访问你需要站外提交的页面，比如 CSDN 登陆页 http://www.csdn.net/member/UserLogin.aspx
2. 填写好需要的资料，比如用户名和密码，
3. 打开 Visual Sniffer, 点“开始拦截”
4. 在访问的页面中提交。
5. 等提交成功之后，在 Visual Sniffer 中“停止拦截”
6. 在 Visual Sniffer 的左侧栏的加号中依次点开，右边是它拦截到的内容：
POST http://www.csdn.net/member/UserLogin.aspx HTTP/1.0
Accept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/x-shockwave-flash, **
Referer: http://www.csdn.net/member/UserLogin.aspx
Accept-Language: zh-cn
UA-CPU: x86
Pragma: no-cache
User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322; InfoPath.1)
Host: www.csdn.net
Proxy-Connection: Keep-Alive
Cookie: ASPSESSIONIDAAAATBQC=FMEGGCKDBKHAMMCGKPFDMBFG; ASP.NET_SessionId=lusprmnom05lr445tmteaf55; userid=699879
以上为拦截内容，其中提交数据的参数部分（程序中的：strArgs）如：
__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=dDwtMTcwMzgxNjQ2Mjs7bDxDU
0ROVXNlckxvZ2luOmNiX1NhdmVTdGF0ZTtDU0ROVXNlckxvZ2luOkltYWdlX0xvZ2luOz4%2Btu
1q2wmRZoAJTi9L73w1zBleylY%3D&CSDNUserLogin%3Atb_UserName=testusername&CSDN
UserLogin%3Atb_Password=testpassword&CSDNUserLogin%3Atb_ExPwd=9232
protected static string cookieHeader;
private void Page_Load(object sender, System.EventArgs e)
{
string strReContent = string.Empty;
//登录
strReContent = PostLogin("http://www.mystand.com.cn/login/submit.jsp提交的页面","提交的参 数：userid=hgj0000&password=06045369","引用地址：http://www.mystand.com.cn /");
//asp.net登录传递的参数需注意
//strReContent = PostLogin("47bDxcZTs%2BPjs%2BOzs%2BOz4%2BOz6aX2dtqkJTK%2BKbNPsjd7Op%2Fl26Iw%3D%3D&txtUserName=hxf&txtPassword=hxf0000&btnEnter=%E7%99%BB%E5%BD%95","http://www.mystand.com.cn/login.aspx">http://www.mystand.com.cn/login.aspx","__VIEWSTATE=dDwtNjkzMjUyNDczO3Q8O2w8aTwzPjs%2BO2w8dDxwPHA8bDxUZXh0Oz47bDxcZTs%2BPjs%2BOzs%2BOz4%2BOz6aX2dtqkJTK%2BKbNPsjd7Op%2Fl26Iw%3D%3D&txtUserName=hxf&txtPassword=hxf0000&btnEnter=%E7%99%BB%E5%BD%95","http://www.mystand.com.cn/login.aspx");
//获取页面
strReContent = GetPage("http://www.mystand.com.cn/company/getdata.jsp?code=","引用地址：http://www.mystand.com.cn/");
//strReContent = GetPage("http://www.mystand.com.cn/Modules/index.aspx","http://www.mystand.com.cn/login.aspx");
//可以对获得的内容进行处理：strReContent
}
/// <summary>
/// 功能描述：模拟登录页面，提交登录数据进行登录，并记录Header中的cookie
/// </summary>
/// <param name="strURL">登录数据提交的页面地址</param>
/// <param name="strArgs">用户登录数据</param>
/// <param name="strReferer">引用地址</param>
/// <returns>可以返回页面内容或不返回</returns>
public static string PostLogin(string strURL,string strArgs,string strReferer)
{
string strResult = "";
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(strURL);
myHttpWebRequest.AllowAutoRedirect = true;
myHttpWebRequest.KeepAlive = true;
myHttpWebRequest.Accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/msword, application/x-shockwave-flash, */// <summary>
/// 功能描述：在PostLogin成功登录后记录下Headers中的cookie，然后获取此网站上其他页面的内容
/// </summary>
/// <param name="strURL">获取网站的某页面的地址</param>
/// <param name="strReferer">引用的地址</param>
/// <returns>返回页面内容</returns>
public static string GetPage(string strURL,string strReferer)
{
string strResult = "";
HttpWebRequest myHttpWebRequest = (HttpWebRequest)WebRequest.Create(strURL);
myHttpWebRequest.ContentType = "text/html";
myHttpWebRequest.Method = "GET";
myHttpWebRequest.Referer = strReferer;
myHttpWebRequest.Headers.Add("cookie:"+ cookieHeader);
HttpWebResponse response = null;
System.IO.StreamReader sr = null;
response = (HttpWebResponse)myHttpWebRequest.GetResponse();
sr = new System.IO.StreamReader(response.GetResponseStream(), Encoding.GetEncoding("gb2312")); // //utf-8
strResult = sr.ReadToEnd();
return strResult;
}
技术应用——网页自动登录（提交Post内容）的用途很多，如验证身份、程序升级、网络投票等，以下是用C#实现的方法.
==================================================================================================================
1.在WebBrowser中获取Cookie
CookieContainer myCookieContainer = new CookieContainer();
string cookieStr = webBrowser1.Document.Cookie;
string[] cookstr = cookieStr.Split(';');
foreach (string str in cookstr)
{
string[] cookieNameValue = str.Split('=');
Cookie ck = new Cookie(cookieNameValue[0].Trim ().ToString(), cookieNameValue[1].Trim ().ToString());
ck.Domain = "www.google.com";
myCookieContainer.Add(ck);
}
WebClient设置cookie!
WebClient wc = new WebClient();
wc.Headers.Add("Cookie", "PHPSESSID=" + cookie + ";");
// 注意，这里是Cookie，不是Set-Cookie
byte[] re = wc.UploadData(Global.RootPath + "test.php", new byte[0]);
System.Text.UTF8Encoding converter = new System.Text.UTF8Encoding();
string str = converter.GetString(re);
2. 在WebBrowser中设置Cookie
public partial class WebBrowserControl : Form
{
private String url;
[DllImport("wininet.dll", CharSet = CharSet.Auto, SetLastError = true)]
public static extern bool InternetSetCookie(string lpszUrlName, string lbszCookieName, string lpszCookieData);
public WebBrowserControl(String path)
{
this.url = path;
InitializeComponent();
// set cookie
InternetSetCookie(url, "JSESSIONID", Globals.ThisDocument.sessionID);
// navigate
webBrowser.Navigate(url);
}
}
3.将WebBrowser的cookie信息传给HttpWebRequest
先建一个"CookieContainer" 把WebBrowser中的Cookie保存在里面
//在WebBrowser中登录cookie保存在WebBrowser.Document.Cookie中
CookieContainer myCookieContainer = new CookieContainer();
//String 的Cookie 要转成 Cookie型的 并放入CookieContainer中
string cookieStr = webBrowser1.Document.Cookie;
string[] cookstr = cookieStr.Split(';');
foreach (string str in cookstr)
{
string[] cookieNameValue = str.Split('=');
Cookie ck = new Cookie(cookieNameValue[0].Trim().ToString(), cookieNameValue[1].Trim().ToString());
ck.Domain = "www.abc.com";//必须写对
myCookieContainer.Add(ck);
}
HttpWebRequest hreq = (HttpWebRequest)HttpWebRequest.Create("http://www.abc.com/search.asp");
hreq.Method = "POST";
hreq.ContentType = "application/x-www-form-urlencoded";
//自己创建的CookieContainer
hreq.CookieContainer = myCookieContainer;
string postdata = "id=2005&action=search&name=";
byte[] byte1 = Encoding.ASCII.GetBytes(postdata);
hreq.ContentLength = byte1.Length;
Stream poststream = hreq.GetRequestStream();
poststream.Write(byte1, 0, byte1.Length);
poststream.Close();
HttpWebResponse hres = (HttpWebResponse)hreq.GetResponse();