Facebook registration - JSON object to C# object

Introduction

A way to recieve a facebook user registration and split it down to parse it into a C# object.

Using the code

In your HTML page:

More info: http://developers.facebook.com/docs/plugins/registration/

<iframe src="https://www.facebook.com/plugins/registration?

client_id=[YOUR API]&

redirect_uri=[YOUR WEBSITE]/GetRegistration&

fields=name,birthday,gender,location,email,password"

scrolling="auto"

frameborder="no"

style="border:none"

allowTransparency="true"

width="390"

height="600">

</iframe>

In your Controller:

public JsonResult GetRegistration()

{

IDictionary<string,object> dict = DecodePayload(Request["signed_request"].Split('.')[1]);

JavaScriptSerializer serializer = new JavaScriptSerializer();

object reg = (object)dict["registration"];

string registrationJson = serializer.Serialize(reg);

IDictionary<string, object> newRegister = (IDictionary<string, object>)serializer.DeserializeObject(registrationJson);

object loc = (object)newRegister["location"];

string locationJson = serializer.Serialize(loc);

IDictionary<string, object> newLocation = (IDictionary<string, object>)serializer.DeserializeObject(locationJson);

string UserID = (string)dict["user_id"];

string namn = newRegister["name"].ToString().Replace("\"", "");

string birthday = newRegister["birthday"].ToString().Replace("\"", "");

string gender = newRegister["gender"].ToString().Replace("\"", "");

string location = newLocation["name"].ToString().Replace("\"", "");

string email = newRegister["email"].ToString().Replace("\"", "");

string password = newRegister["password"].ToString().Replace("\"", "");

string ImageURL = "graph.facebook.com/" + UserID + "/picture&type=large";

//Now when we have the strings, we can create our own registration model, or put it in our database... 

return Json("something", JsonRequestBehavior.AllowGet);

}

I got the decoding method from : Pavel Chuchuva @ http://stackoverflow.com/questions/3433252/how-to-decode-oauth-2-0-for-canvas-signed-request-in-c

public IDictionary<string, object> DecodePayload(string payload)
{
string base64 = payload.PadRight(payload.Length + (4 - payload.Length % 4) % 4, '=')

.Replace('-', '+').Replace('_', '/');

string json = Encoding.UTF8.GetString(Convert.FromBase64String(base64));

return (IDictionary<string, object>)new JavaScriptSerializer().DeserializeObject(json);

}

Good luck!