Require Google to return email address as part of OAuth

Question

I am using OAuth to access Gmail with dotNetOAuth. How can I force Google to return user\'s email address as part of callback after authorization?

By default, Google

Answer 1

Here's a c# function for when you have pre-authorized the request as detailed above:

        private void FetchUsersEmail(token)
        {
            var emailRequest = @"https://www.googleapis.com/userinfo/email?alt=json&access_token=" + token;
            // Create a request for the URL.        
            var request = WebRequest.Create(emailRequest);
            // Get the response.
            var response = (HttpWebResponse) request.GetResponse();
            // Get the stream containing content returned by the server.
            var dataStream = response.GetResponseStream();
            // Open the stream using a StreamReader for easy access.
            var reader = new StreamReader(dataStream);
            // Read the content. 
            var jsonString = reader.ReadToEnd();
            // Cleanup the streams and the response.
            reader.Close();
            dataStream.Close();
            response.Close();

            dynamic json = JValue.Parse(jsonString);
            var currentGoogleEmail = json.data.email;
        }

(JValue is part of JSON.Net)