UCenter论坛同步的时候当前注册的用户能同步上论坛，而以前注册的用户(就是那时候还没做论坛同步)死活同步不上，

这个不返回那一串HTML代码

贴上代码，这个代码是如果没注册过论坛先注册乱弹，注册过后再登陆。

 DS.Web.UCenter.Client.IUcClient client3 = new DS.Web.UCenter.Client.UcClient();
  var user = client3.UserLogin(username, password);//登陆
                        if (user.Success && user.UserName != "")//判断是否登陆成功
                        {
                            //判断用户返回值，判断是否合法
                            if (user.Uid == -1)
                            {
                                return "DZ论坛同步：用户名不存在或被删除！";
                            }
                            if (user.Uid == -2)
                            {
                                return "DZ论坛同步登陆：密码错误或者不符合规则！";
                            }
                            if (user.Uid == -3)
                            {
                                return "DZ论坛同步登陆：安全提问题没有输入！";
                            }
                            //web.DAL.web_Member.UpUcentID(user.Uid, username);
                            return string.Format("0,{0}<script type='text/javascript'>window.parent.parent.location = window.parent.parent.location;</script>", client3.UserSynlogin(user.Uid));//返回同步脚本，进行同步登陆
                        }
                        else
                        {
                            DS.Web.UCenter.Client.IUcClient client2 = new DS.Web.UCenter.Client.UcClient();
                            var userback = client2.UserRegister(username, Common.PublicFc.NoHTML(password), email);
                            if (userback.Uid == -1)
                            {
                                return "DZ论坛同步注册：用户名不合法！";
                            }
                            if (userback.Uid == -2)
                            {
                                return "DZ论坛同步注册：包含不允许注册的词语！";
                            }
                            if (userback.Uid == -3)
                            {
                                return "DZ论坛同步注册：用户名已经存在！";
                            }
                            if (userback.Uid == -4)
                            {
                                return "DZ论坛同步注册：Email 格式有误！";
                            }
                            if (userback.Uid == -5)
                            {
                                return "DZ论坛同步注册：Email 不允许注册！";
                            }
                            if (userback.Uid == -6)
                            {
                                return "DZ论坛同步注册：该 Email 已经被注册！";
                            }

                            DS.Web.UCenter.Client.IUcClient client6 = new DS.Web.UCenter.Client.UcClient();
                            var userDL = client6.UserLogin(username, password);//登陆
                            if (userDL.Success)//判断是否登陆成功
                            {
                                //判断用户返回值，判断是否合法
                                if (userDL.Uid == -1)
                                {
                                    return "DZ论坛同步：用户名不存在或被删除！";
                                }
                                if (userDL.Uid == -2)
                                {
                                    return "DZ论坛同步登陆：密码错误或者不符合规则！";
                                }
                                if (userDL.Uid == -3)
                                {
                                    return "DZ论坛同步登陆：安全提问题没有输入！";
                                }
                                web.DAL.web_Member.UpUcentID(userDL.Uid, username);
                                return string.Format("0,<script type='text/javascript'>window.parent.parent.location = window.parent.parent.location;</script>,{0}", client6.UserSynlogin(userDL.Uid));//返回同步脚本，进行同步登陆
                            }
                            else
                            {
                                return "0";
                            }