小编Tan*_*ang的帖子

我有一个json流,可以是这样的:

{"intervention":

    { 
      "id":"3",
              "subject":"dddd",
              "details":"dddd",
              "beginDate":"2012-03-08T00:00:00+01:00",
              "endDate":"2012-03-18T00:00:00+01:00",
              "campus":
                       { 
                         "id":"2",
                         "name":"paris"
                       }
    }
}

或类似的东西

{"intervention":
            [{
              "id":"1",
              "subject":"android",
              "details":"test",
              "beginDate":"2012-03-26T00:00:00+02:00",
              "endDate":"2012-04-09T00:00:00+02:00",
              "campus":{
                        "id":"1",
                        "name":"lille"
                       }
            },

    {
     "id":"2",
             "subject":"lozlzozlo",
             "details":"xxx",
             "beginDate":"2012-03-14T00:00:00+01:00",
             "endDate":"2012-03-18T00:00:00+01:00",
             "campus":{
                       "id":"1",
                       "name":"lille"
                      }
            }]
}   

在我的Java代码中,我执行以下操作:

JSONObject json = RestManager.getJSONfromURL(myuri); // retrieve the entire json stream     
JSONArray  interventionJsonArray = json.getJSONArray("intervention");

在第一种情况下,上面的方法不起作用,因为流中只有一个元素.如何检查流是一个object还是一个array？

我试过json.length()但它没有用..

谢谢

每次我尝试将用户附加到组(或创建组)时,我都会收到此错误.

这是GroupController:

public class GroupsController : Controller
{
       private Context db = new Context();

        [HttpPost]
        public ActionResult Create(Group group)
        {
            if (ModelState.IsValid)
            {
                group.owner = db.Users.Attach((User)Session["user"]);
    //current user stored in session
                db.Groups.Add(group);
                db.SaveChanges();

                return RedirectToAction("Index", "Home");
            }
            return View(group);
        }
}

变量Session ["user"]设置为logon,这里是AccountController代码:

public class AccountController : Controller
{
    private Context db = new Context();

    [HttpPost]
    public ActionResult LogOn(LoginTemplate login, string returnUrl)
    {

            User result = db.Users.Where(m => m.email == login.email).Where(m => m.password == login.password).SingleOrDefault();

            if (result != null)
            { …