/// <summary>
        /// 登录
        /// </summary>
        /// <param name="obj">此参数是为了符合WaitCallback委托的方法签名而设,无实际意义</param>
        private void login(object obj)
        {
            try
            {
                running = true;
                // 等待
                sleep();
                if (stop == true)
                {
                    return;
                }
                if (obj != null)
                {
                    Thread.CurrentThread.Name = obj.ToString();
                }
                if (logged == true)
                {
                    if (MessageBox.Show("您已经登录,您需要再次进入12306网站吗?如果您已经退出,就需要重新登录!", "德广火车票助手 温馨提示", MessageBoxButtons.YesNo, MessageBoxIcon.Information, MessageBoxDefaultButton.Button2) == DialogResult.Yes)
                    {
                        this.Invoke(LoggedDelegate);
                        //openie();
                    }
                    running = false;
                    return;
                }

                Trace.WriteLine("login()");
                count++;
                System.Net.ServicePointManager.CertificatePolicy = new MyPolicy();
                //通过此路径取得登录需要的loginRand变量的值,随机码.
                string uri = "https://dynamic.12306.cn/otsweb/loginAction.do?method=loginAysnSuggest";

                string randStr = CommUitl.getString(uri, CommData.cookieContainer);
                
                randStr = randStr.Split(',')[0].Split(':')[1].Replace("\"", string.Empty);


                //登录请求提交路径
                uri = "https://dynamic.12306.cn/otsweb/loginAction.do?method=login";

                // 为参数变量赋值
                List<KeyValuePair<string, string>> param = new List<KeyValuePair<string, string>>();
                // 随机码
                param.Add(new KeyValuePair<string, string>("loginRand", randStr));
                // 退票登录
                param.Add(new KeyValuePair<string, string>("refundLogin", "N"));
                // 退票标识
                param.Add(new KeyValuePair<string, string>("refundFlag", "Y"));
                // 登录用户名
                param.Add(new KeyValuePair<string, string>("loginUser.user_name", txtUserName.Text));
                // 
                param.Add(new KeyValuePair<string, string>("nameErrorFocus", string.Empty));
                // 密码
                param.Add(new KeyValuePair<string, string>("user.password", txtPassword.Text));
                // 
                param.Add(new KeyValuePair<string, string>("passwordErrorFocus", string.Empty));
                // 图形验证码
                param.Add(new KeyValuePair<string, string>("randCode", txtVerificationCode.Text));
                // 
                param.Add(new KeyValuePair<string, string>("randErrorFocus", string.Empty));

                HttpWebResponse response = null;
                try
                {
                    // 提交登录请求
                    response = HttpWebResponseUtility.CreatePostHttpResponse(uri, param, null, DefaultUserAgent, Encoding.ASCII, cookieCollection, uri);
                }
                catch (Exception ex)
                {
                    // 显示异常信息
                    this.Invoke(this.showMsgDelegate, ex.Message);
                }

                if (response != null)
                {
                    // 得到返回的数据流
                    Stream receiveStream = response.GetResponseStream();
                    // 如果有压缩,则进行解压
                    if (response.ContentEncoding.ToLower().Contains("gzip"))
                    {
                        receiveStream = new GZipStream(receiveStream, CompressionMode.Decompress);
                    }
                    // 得到返回的字符串
                    html = new StreamReader(receiveStream).ReadToEnd();
                    // 进行各种错误判断
                    if (html.IndexOf("当前访问用户过多") > 0)
                    {
                        this.Invoke(this.showMsgDelegate, "当前访问用户过多");
                        login(null);
                    }
                    else if (html.IndexOf("请输入正确的验证码") > 0)
                    {
                        messageBoxShowInfo("请输入正确的验证码!");
                        this.Invoke(focusDelegate, new object[] { txtVerificationCode });
                        this.Invoke(setControlTextDelegate, new object[] { txtVerificationCode, string.Empty, true });
                        getVerificationCode(this);
                    }
                    else if (html.IndexOf("登录名不存在") > 0)
                    {
                        messageBoxShowInfo("登录名不存在!!");
                        this.Invoke(focusDelegate, new object[] { txtUserName });
                    }
                    else if (html.IndexOf("密码输入错误") > 0)
                    {
                        messageBoxShowInfo("密码输入错误,如果多次输入错误可能会被锁定帐户!");
                        this.Invoke(focusDelegate, new object[] { txtPassword });
                        this.Invoke(setControlTextDelegate, new object[] { txtPassword, string.Empty, true });
                    }
                    else if (html.IndexOf("已经被锁定") > 0)
                    {
                        messageBoxShowInfo("您的用户已经被锁定,请稍候再试!");
                    }
                    else if (html.IndexOf("系统维护中") > 0)
                    {
                        //messageBoxShowInfo("系统维护中!");
                        this.Invoke(this.showMsgDelegate, "系统维护中!");
                        Thread.Sleep((Int32)numInterval.Value*1000);
                        login(null);
                    }
                    else if (html.IndexOf("我的12306") > 0)
                    {
                        // 登录成功,激活窗口,提醒用户
                        this.Invoke(activateDelegate);
                        // 记录登录用时及次数
                        endTime = DateTime.Now;
                        logged = true;
                        timeSpan = endTime.Subtract(beginTime);
                        timeSpanStr = getTimeSpanString(timeSpan);

                        //MessageBox.Show("经过 " + timeSpanStr + ", " + count + " 次的尝试后,您已经登录成功!" + Environment.NewLine
                        //    + "点击确定打开12306网站,请忽略登录界面,直接点击\"车票预订\"就可以啦!" + Environment.NewLine
                        //    + Environment.NewLine
                        //    + "深圳市德广信息技术有限公司 祝您:" + Environment.NewLine
                        //    + "回家一路顺风!全家身体健康!幸福快乐!事事如意!", "德广火车票助手 恭喜您", MessageBoxButtons.OK, MessageBoxIcon.Information, MessageBoxDefaultButton.Button1);
                        this.Invoke(this.showMsgDelegate, "登录成功:用"+timeSpanStr + "/" + count + " 次");
                        // 触发登录成功事件
                        this.Invoke(LoggedDelegate);
                        // 修改要发布到微博的默认内容
                        this.Invoke(shareToWeiboDelegate, new object[] { "我用#德广火车票助手#经过" + timeSpanStr + "尝试登录" + count + "次后,成功登录上了12306.cn!你用了多长时间才登录成功的呢?" });
                        //openie();
                        //this.Invoke(this.showMsgDelegate, "登录成功!");
                    }
                    else
                    {
                        Trace.WriteLine(html);
                        login(null);
                    }

                    Trace.WriteLine(response.StatusCode);
                }
                else
                {
                    login(null);
                }
            }
            catch (WebException webex)
            {
                this.Invoke(this.showMsgDelegate, webex.Message);
                login(null);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "异常", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
            finally
            {
                this.Invoke(setControlTextDelegate, new object[] { btnLogin, "登录", true });
                running = false;
            }
        }