facebook-graph-api - Facebook c# sdk 登录并将访问令牌发布到服务器

Question

我正在使用 javascript sdk 登录并将 accesstoken 发布到服务器，如 facebook c# sdk 入门页面中所述。我有几个问题。

1. 它使用 auth.authResponseChange 每次都会触发，这会导致重定向循环
2. 如果我将其更改为 auth.login，它只会在用户通过我的网站登录时被调用。如果他们已经登录到 fb，它就不起作用。
3. 如何仅将访问令牌发布一次回服务器并将其存储在会话中？

4. 如果我在服务器上使用 oauth 身份验证，是否可以将访问令牌传递回 javascript sdk？

   FB.Event.subscribe('auth.authResponseChange', function(response) {
       if (response.status === 'connected') {
           // the user is logged in and has authenticated your
           // app, and response.authResponse supplies
           // the user's ID, a valid access token, a signed
           // request, and the time the access token 
           // and signed request each expire
           var uid = response.authResponse.userID;
           var accessToken = response.authResponse.accessToken;
   
           // TODO: Handle the access token
           // Do a post to the server to finish the logon
           // This is a form post since we don't want to use AJAX
           var form = document.createElement("form");
           form.setAttribute("method", 'post');
           form.setAttribute("action", '/FacebookLogin.ashx');
   
           var field = document.createElement("input");
           field.setAttribute("type", "hidden");
           field.setAttribute("name", 'accessToken');
           field.setAttribute("value", accessToken);
           form.appendChild(field);
   
           document.body.appendChild(form);
           form.submit();
   
       } else if (response.status === 'not_authorized') {
           // the user is logged in to Facebook, 
           // but has not authenticated your app
       } else {
          // the user isn't logged in to Facebook.
       }
   });