loginasync

public class CommonsAsync
{
public CookieContainer cookie = new CookieContainer();
private string loginUrl = "http://passport.cnblogs.com/login.aspx";
string loginData = "__EVENTTARGET=&__EVENTARGUMENT=&__VIEWSTATE=%2FwEPDwULLTE1MzYzODg2NzZkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYBBQtjaGtSZW1lbWJlcm1QYDyKKI9af4b67Mzq2xFaL9Bt&__EVENTVALIDATION=%2FwEdAAUyDI6H%2Fs9f%2BZALqNAA4PyUhI6Xi65hwcQ8%2FQoQCF8JIahXufbhIqPmwKf992GTkd0wq1PKp6%2B%2F1yNGng6H71Uxop4oRunf14dz2Zt2%2BQKDEIYpifFQj3yQiLk3eeHVQqcjiaAP&tbUserName=ListenCode&tbPassword=xiao123&btnLogin=%E7%99%BB++%E5%BD%95&txtReturnUrl=http%3A%2F%2Fhome.cnblogs.com%2Fing%2Fmy";
string commentData = "{\"ContentID\":209916,\"Content\":\"ceshi。\",\"strComment\":\"\",\"parentCommentId\":\"0\",\"title\":\"ddddd\"}";

public CommonsAsync()
{

}

HttpWebRequest request = null;
HttpWebRequest newRequest = null;

public void Login()
{
request = (HttpWebRequest)HttpWebRequest.Create(loginUrl);
request.Method = "Post";
request.ContentType = "application/x-www-form-urlencoded";
request.KeepAlive = true;
request.CookieContainer = cookie;
request.BeginGetRequestStream(new AsyncCallback(BeginRequest), new string[] { loginData, "login" });
}

public void NewComments(CookieContainer cookie)
{
string url = "http://news.cnblogs.com/mvcajax/news/InsertComment";
newRequest = (HttpWebRequest)HttpWebRequest.Create(url);
newRequest.Method = "Post";
newRequest.ContentType = "application/json; charset=UTF-8";
newRequest.KeepAlive = true;
newRequest.CookieContainer = cookie;
newRequest.ProtocolVersion = HttpVersion.Version11;

newRequest.BeginGetRequestStream(new AsyncCallback(BeginRequest), new string[] { commentData, "news" });
}

public void BeginRequest(IAsyncResult asy)
{
string[] re = asy.AsyncState as string[];
byte[] postBytes = System.Text.Encoding.UTF8.GetBytes(re[0]);

if (re[1].Equals("news"))
{
Stream sr = newRequest.GetRequestStream();
sr.Write(postBytes, 0, postBytes.Length);
sr.Close();
newRequest.BeginGetResponse(new AsyncCallback(BeginResponse), re);
}
else if (re[1].Equals("login"))
{
Stream sr = request.GetRequestStream();
sr.Write(postBytes, 0, postBytes.Length);
sr.Close();
request.BeginGetResponse(new AsyncCallback(BeginResponse), re);
}
}

public void BeginResponse(IAsyncResult asy)
{
if (asy.AsyncState != null)
{
string[] re = asy.AsyncState as string[];

HttpWebResponse response = null;

if (re[1].Equals("news"))
{
response = (HttpWebResponse)newRequest.EndGetResponse(asy);
}
else if (re[1].Equals("login"))
{
response = (HttpWebResponse)request.EndGetResponse(asy);
}

using (Stream sr = response.GetResponseStream())
{
using (StreamReader sre = new StreamReader(sr, System.Text.Encoding.UTF8))
{
string s = sre.ReadToEnd();
}
}
}
}

}