Get AccessToken on the Landing Page using Facebook C# SDK

Coding Platform ASP.NET 4.0 WebForms

I have two pages that are relevant here

1. Login.aspx
2. LandingPage.aspx

On Login.aspx when I click an ImageButton, I redirect to Facebook site with the following code

protected void FacebookLoginButton_Click(object sender, ImageClickEventArgs e)
{
    try
    {
        Response.Redirect(GetFacebookLoginURL());
    }
    catch (System.Threading.ThreadAbortException)
    {
        throw;
    }
    catch (Exception err)
    {
        Elmah.ErrorSignal.FromCurrentContext().Raise(err);
    }
}

private string GetFacebookLoginURL()
{
    try
    {
        string baseURL = System.Configuration
            .ConfigurationManager
            .AppSettings["WebsiteURL"]
            .ToString();

        string[] extendedPermissions = new[] { 
            "publish_stream", 
            "offline_access" 
        };

        var oauth = ne开发者_如何学Pythonw FacebookOAuthClient { 
            ClientId = FacebookContext.Current.AppId 
        };

        var parameters = new Dictionary<string, object>{
            { "response_type", "token" },
            { "display", "page" }
        };

        if (extendedPermissions != null && extendedPermissions.Length > 0)
        {
            var scope = new StringBuilder();
            scope.Append(string.Join(",", extendedPermissions));

            parameters["scope"] = scope.ToString();
        }
        parameters["redirect_uri"] = String.Format("{0}LandingPage.aspx", baseURL);
        return oauth.GetLoginUrl(parameters).OriginalString;
    }
    catch (Exception err)
    {
        Elmah.ErrorSignal.FromCurrentContext().Raise(err);
        return "";
    }
}

That part is working properly. But I am clueless on how to access the user info at the LandingPage which is my redirect_uri. Have tried this.

    FacebookOAuthClient cl = new FacebookOAuthClient(FacebookContext.Current);
    FacebookOAuthResult result = null; 
    string url = Request.Url.AbsoluteUri;

    // verify that there is a code in the url
    if (FacebookOAuthResult.TryParse(url, out result))
    {
        if (result.IsSuccess)                               
        {
            var accesstoken = result.AccessToken;
        }
        else
        {
            var errorDescription = result.ErrorDescription;
            var errorReason = result.ErrorReason;
        }
    }

But I doubt it wont work since I dont have window.hash.location at Server Side(Its not working anyway)

    var client = new FacebookClient(FacebookContext.Current);
    dynamic me = client.Get("me");
    string firstName = me.first_name;
    string lastName = me.last_name;
    string email = me.email;

Although I am not sure, getting the Access Token will solve my problem, won't it? This is the error I am getting.

(OAuthException) An active access token must be used to query information about the current user.

What am I doing wrong?

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here's a sample of a standalone website using webforms. Check out Default.aspx.cs and Web.config. Please note that this sample could be modified for use with the latest source code and might not work with the latest release (5.0.3 beta).

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I just recently did this implementation. To access "me", you need to have an Access Token.

The implementation is pretty straighforward, however, I will say that I found the major stumbling block for me was to make sure that my redirect_uri from my "Login.aspx" url matched the redirect_uri from my landing page.

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It must be simple, but I dodnt get it. So I used the lesser used Facebook C# SDK by Facebook. I pretty much did what this blog suggested. Everything is fine now.