MVC4 WebAPI POST数据问题

 [HttpPost]
 public string PostAvartos(Test model)
{
　　if (model != null)
　　{
　　　　LoggerHelper.WriteInfo(model.id + " " + model.name); 
　　}
　　else
　　{
　　　　LoggerHelper.WriteInfo("error");
　　}

return "";
}

public class Test
    {
        public int id { get; set; }
        public string name { get; set; }
    }

 $.ajax({
            url: "/api/PostAvartos",
            type: "post",
            data: {id:1,name:'2'},
            contentType: "application/json"
        });

[Serializable]
public class Test
    {
        public int id { get; set; }
        public string name { get; set; }
    }