Dotnetopenauth, retrieve email from facebook scope

Question

Have a question I surpsisingly couldnt find an answer to when searching around.

If I request a users email from facebook like:

var scope = new List<string>();
                scope.Add("email");
                FbClient.RequestUserAuthorization(scope);

How do I retrieve it? I couldnt find a clear option for this in the FacebookGraph.

Answer 1

Near as I can tell, the FacebookGraph object that is in the examples from DotNetOpenAuth does not support changing the fields that you are receiving. However, since WebRequest that it is prompting is returning a JSON string, you can parse it yourself (or use another JSON parser). That's exactly what I did, using the NewtonSoft.Json.dll:

//as part of the uri for the webrequest, include all the fields you want to use
var request = WebRequest.Create("https://graph.facebook.com/me?fields=email,name&access_token=" + Uri.EscapeDataString(authorization.AccessToken));
using (var response = request.GetResponse())
{
    using (var responseStream = response.GetResponseStream())
    {
        System.IO.StreamReader streamReader = new System.IO.StreamReader(responseStream, true);
        string MyStr = streamReader.ReadToEnd();
        JObject userInfo = JObject.Parse(MyStr);

        //now you can access elements via: 
        // (string)userInfo["name"], userInfo["email"], userInfo["id"], etc.
    }
}

Note that you specify what fields you want sent back as part of the WebRequest URI. The fields that are available can be found at https://developers.facebook.com/docs/reference/api/user/

Answer 2

Using DNOA This answer did it for me.

Just added the following:

var scope = new List<string>();
scope.Add("email");

client.RequestUserAuthorization(scope);

and the following to the facebook graph.

[DataMember(Name = "email")]
public string EMail { get; set; }

Answer 3

What you wrote above appears to be requsting authorization from the user to allow your app to get email back when you query the user's object. To query the user's object you do an HTTP Get on https://graph.facebook.com/me. Try it out in the Graph API explorer tool at https://developers.facebook.com/tools/explorer