问Facebook离线访问.NET SDK

EN

protected void Page_Load(object sender, EventArgs e)
{
    var auth = new CanvasAuthorizer { Permissions = new[] { "user_about_me", "publish_stream", "video_upload", "share_item", "photo_upload", "offline_access" } };

    var fbWebContext = FacebookWebContext.Current;
    if (fbWebContext.IsAuthorized())
    {
        try
        {
            var fb = new FacebookWebClient(fbWebContext);
            var token = fb.AccessToken;  \\ Im Getting Token This Way When its Generated From User After Getting Extended Permission
            dynamic result = fb.Get("/me");
            long id = fbWebContext.UserId;
        }
        catch (Exception ex)
        {
            if ("(OAuthException) Error validating access token: The session is invalid because the user logged out or because auth.expireSession was invoked." == ex.Message)
            {
                fbWebContext.DeleteAuthCookie();
                Session.Clear();
            }
        }
    }
}