Error when passing Model object to my view - asp.net-mvc

Question

I have created the following model object:-
namespace MvcApplication1.Models
{
public class listofpack
{
public string packageName { get; set; }
public string packageId { get; set; }
}
}
Which i am populating its value on the controller as follow:-
public ActionResult Index()
{
ViewBag.Message = "Modify this template to jump-start your ASP.NET MVC application.";
using (var client = new WebClient())
{
var query = HttpUtility.ParseQueryString(string.Empty);
query["j_username"] = "kermit";
query["hash"] = "9449B5ABCFA9AFDA36B801351ED3DF66";
query["loginAs"] = "admin";
query["loginAs"] = User.Identity.Name;
var url = new UriBuilder("http://localhost:8080/jw/web/json/workflow/package/list");
url.Query = query.ToString();
string json = client.DownloadString(url.ToString());
var model = new JavaScriptSerializer().Deserialize<listofpack>(json);
return View(model);
// return Content(json, "application/json");
}
}
After that on the view i am trying to loop through the model as follow:-
#model IEnumerable<MvcApplication1.Models.listofpack>
#{
ViewBag.Title = "Home Page";
}
#foreach(var item in Model) {
#Html.ActionLink(item.packageId.ToString(), "about", "Home", new { id = "crm"},null)
}
but when i run the view i will get the following error:-
The model item passed into the dictionary is of type 'MvcApplication1.Models.listofpack', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable`1[MvcApplication1.Models.listofpack]'.
BR
:::UPDATE::::
-----------------------------------------------------------------------------------------------------------------------------------------------------------------
i have updated the controller code to be:-
public ActionResult Index()
{
ViewBag.Message = "Modify this template to jump-start your ASP.NET MVC application.";
using (var client = new WebClient())
{
var query = HttpUtility.ParseQueryString(string.Empty);
query["j_username"] = "kermit";
query["hash"] = "9449B5ABCFA9AFDA36B801351ED3DF66";
query["loginAs"] = "admin";
query["loginAs"] = User.Identity.Name;
var url = new UriBuilder("http://localhost:8080/jw/web/json/workflow/package/list");
url.Query = query.ToString();
string json = client.DownloadString(url.ToString());
var model = new JavaScriptSerializer().Deserialize <List<listofpack>>(json);
return View(model);
}
}
and on the view:-
#model List<MvcApplication1.Models.listofpack>
#Model.Count();
#foreach(var item in Model) {
#Html.ActionLink(item.packageId.ToString(), "about", "Home", new { id = "crm"},null)
}
But the problem is that nothing will be displayed in the view and the .count() will return zero although there should be 5 jason objects passed to the view. So what might be going wrong??
Best Regards

Answer 1

var model = new JavaScriptSerializer().Deserialize<listofpack>(json);
is deserializing into a single listofpack object. Your view expects
#model IEnumerable<MvcApplication1.Models.listofpack>
maybe try something along this lines:
var model = new JavaScriptSerializer().Deserialize<IEnumerable<listofpack>>(json);

Answer 2

Read this question :
No parameterless constructor defined for type of 'System.String' during JSON deserialization
No parameterless constructor defined for type of 'System.Collections.Generic.IEnumerable`1[[MvcApplication1.Models.listofpack, MvcApplication1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null]]'.
This exception means that the generic type "IEnumerable< listofpack >" u used doesn't have a constructor because it's an interface,so you should use "Dictionary" or "List"
Edit:
Here's an example:
I created a class and name it Employee:
public class Employee
{
public string lastName { get; set; }
public string firstName { get; set; }
}
then i wrote the following statements in the controller :
string jsonEmployees="{'employees': [{ 'firstName':'John' , 'lastName':'Doe' }, { 'firstName':'Anna' , 'lastName':'Smith' }, { 'firstName':'Peter' , 'lastName':'Jones' }]}";
var model = new JavaScriptSerializer().Deserialize<Dictionary<string,List<Employee>>>(jsonEmployees);
return View(model);
so try using "Dictionary< string,List< listOfpack >>".