LinqToTwitter BeginAuthorization不重定向

Question

此Twitter登录页面（使用LinqToTwitter）按预期工作，直到用户登录，然后注销，然后再次登录同一会话。

此时语句（代码片段底部）

_auth.BeginAuthorization(returnURI);

似乎已执行，但未执行重定向。

任何人都有这种经历或有建议，我很难过。

任何想法的TIA！

代码：

 protected void Page_Load(object sender, EventArgs e)
    {

        _credentials = new SessionStateCredentials();
        if (_credentials.ConsumerKey == null || _credentials.ConsumerSecret == null)
        {
            _credentials.ConsumerKey = ConfigurationManager.AppSettings["twitterConsumerKey"];
            _credentials.ConsumerSecret = ConfigurationManager.AppSettings["twitterConsumerSecret"];
        }
        _auth = new WebAuthorizer
        {
            Credentials = _credentials,
            PerformRedirect = authUrl => Response.Redirect(authUrl)
        };

        if (!IsPostBack)
        {

            if (Request.QueryString["act"] != null)
            {
                string act = Request.QueryString["act"].ToString();
                switch (act)
                {
                    case "login":
                        _auth.CompleteAuthorization(Request.Url);

                        // we do record tokens in SQL here but code removed
                        // for this exercise

                        //log us in for FormsAuthentication
                              FormsAuthentication.SetAuthCookie(_auth.Credentials.ScreenName, false);

                        string ret = Request.QueryString["ret"];
                        Response.Redirect(HttpUtility.UrlDecode(ret));
                        break;
                    case "logout":
                        FormsAuthentication.SignOut();
                        _credentials = null;
                        _auth = null;
                        Response.Redirect("~/");
                        break;
                }
            }
            else
            {
                if (_auth != null)
                {
                    _return = Request.QueryString["ret"];
                    string OAuthReturnUrl = String.Format("http://mydomain.com/login?act=login&ret={0}&ts={1}", HttpUtility.UrlEncode(_return), DateTime.Now);
                    Uri returnURI = new Uri(OAuthReturnUrl);

                    /******************************************
                     on second login in same browser session this executes
                     and return URI is correct but no 
                     redirect takes place. ???
                     ******************************************/
                    _auth.BeginAuthorization(returnURI);
                }
            }
        }
    }

Answer 1

我的不好......当然，SessionCredentials使用会话状态：

 if (_auth != null)
                {
                    _return = Request.QueryString["ret"];
                    string OAuthReturnUrl = String.Format("http://myDomain.com/login?act=login&ret={0}&ts={1}", HttpUtility.UrlEncode(_return), DateTime.Now);
                    Uri returnURI = new Uri(OAuthReturnUrl);
                    _credentials.AccessToken = null;
                    _credentials.OAuthToken = null;
                    _credentials.ScreenName = "";
                    _auth.Credentials = _credentials;
                    _auth.BeginAuthorization(returnURI);
                }

重置以前获得的令牌并允许重定向。