ASP.NET MVC3 JSON Model-binding with nested class -

in mvc3, possible automatically bind javascript objects models if model has nested objects? model looks this:

 public class tweet  {     public tweet()     {          coordinates = new geo();     }     public string id { get; set; }     public string user { get; set; }     public datetime created { get; set; }     public string text { get; set; }     public geo coordinates { get; set; }   }  public class geo {      public geo(){}      public geo(double? lat, double? lng)     {         this.latitude = lat;         this.longitude = lng;     }      public double? latitude { get; set; }     public double? longitude { get; set; }      public bool hasvalue     {                 {             return (latitude != null || longitude != null);         }     } } 

when post following json controller except "coordinates" binds successfully:

{"text":"test","id":"testid","user":"testuser","created":"","coordinates":{"latitude":57.69679752892457,"longitude":11.982091465576104}} 

this controller action looks like:

    [httppost]     public jsonresult retweet(tweet tweet)     {         //do stuff     } 

am missing here or new auto-binding feature support primitive objects?

yes, can bind complex json objects asp.net mvc3.

phil haack wrote recently.
you've got problem geo class here.
don't use nullable properties:

public class geo {      public geo() { }      public geo(double lat, double lng)     {         this.latitude = lat;         this.longitude = lng;     }      public double latitude { get; set; }     public double longitude { get; set; }      public bool hasvalue     {                 {             return (latitude != null || longitude != null);         }     } } 

this javascript code i've use test it:

var jsondata = { "text": "test", "id": "testid", "user": "testuser", "created": "", "coordinates": { "latitude": 57.69679752892457, "longitude": 11.982091465576104} }; var tweet = json.stringify(jsondata); $.ajax({     type: 'post',     url: 'home/index',     data: tweet,     success: function () {         alert("ok");     },     datatype: 'json',     contenttype: 'application/json; charset=utf-8' }); 

update

i've tried experiments model binders , came out solutions seems work nullable types.

i've created custom model binder:

using system; using system.web.mvc; using system.io; using system.web.script.serialization;  public class tweetmodelbinder : imodelbinder {     public object bindmodel(controllercontext controllercontext, modelbindingcontext bindingcontext)     {         var contenttype = controllercontext.httpcontext.request.contenttype;         if (!contenttype.startswith("application/json", stringcomparison.ordinalignorecase))             return (null);          string bodytext;          using (var stream = controllercontext.httpcontext.request.inputstream)         {             stream.seek(0, seekorigin.begin);             using (var reader = new streamreader(stream))                 bodytext = reader.readtoend();         }          if (string.isnullorempty(bodytext)) return (null);          var tweet = new javascriptserializer().deserialize<models.tweet>(bodytext);          return (tweet);     } } 

and i've registered types tweet:

    protected void application_start()     {         arearegistration.registerallareas();          modelbinders.binders.add(typeof(models.tweet), new tweetmodelbinder());          registerglobalfilters(globalfilters.filters);         registerroutes(routetable.routes);     }