C# 模拟 Post

方式一：不启动IE，代码中Post

  try
                {
                    string url = "http:\\xxx.com" ;
                    string postString = "uid=xx&pwd=xxx";
                    byte[] postData = Encoding.UTF8.GetBytes(postString);

                    HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(url));
                    request.Method = "POST";
                    //for some customer,use proxy, so add this.
                    //refer:http://www.cnblogs.com/cxd4321/archive/2012/01/30/2331621.html
                    request.ServicePoint.Expect100Continue = false;
                    int timeout = 5000;
                    Int32.TryParse(Settings.Default.LoginTimeOut, out timeout);
                    if (timeout < 5000 || timeout > 15000)
                        timeout = 5000;
                    request.Timeout = timeout;
                    request.ContentType = "application/x-www-form-urlencoded";
                    request.ContentLength = postData.Length;
                    using (Stream requestStream = request.GetRequestStream())
                    {
                        requestStream.Write(postData, 0, postData.Length);
                    }
                    HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                    StreamReader stream = new StreamReader(response.GetResponseStream(), Encoding.Default);
                    string srcString = stream.ReadToEnd();
                    response.Close();
                    stream.Close();
                    Trace.WriteLine(srcString);
                }
                catch (Exception ex)
                {
                    Trace.WriteLine(ex);
                }

 string url ="http://xxx.com"
                        string postString = "parms=xx&pid=yyy";
                        byte[] postData = Encoding.UTF8.GetBytes(postString);
                        WebClient webClient = new WebClient();
                        webClient.UseDefaultCredentials = true;
                        webClient.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
                        byte[] responseData = webClient.UploadData(url, "POST", postData);
                        string srcString = Encoding.UTF8.GetString(responseData);
                        Trace.WriteLine(srcString);

方式二：启动IE，并模拟Post

先添加引用，COM-->Microsoft Internet Controls

再添加代码：

            string postData = "username=admin&password=admin";
            var ie = new InternetExplorer();
            object vPost, vHeaders, vFlags, vTargetFrame;
            vPost = null;
            vFlags = null;
            vTargetFrame = null;
            vHeaders = "Content-Type: application/x-www-form-urlencoded" + Convert.ToChar(10) + Convert.ToChar(13);
            if (!string.IsNullOrEmpty(postData))
                vPost = ASCIIEncoding.Default.GetBytes(postData);
            ie.Visible = true;
            string url = "http://{IP}/validate";
            ie.Navigate(url, ref vFlags, ref vTargetFrame, ref vPost, ref vHeaders);