The model item passed into the dictionary is of type 'System.Data.Entity.DynamicProxies.People', but this dictionary requires a model item of type

Question

I need pass two models in the Edit page (because I want to build a MVC 4 project with ViewModel), but when I try insert the view model in the edit page, I have the follow error:

The model item passed into the dictionary is of type 'System.Data.Entity.DynamicProxies.People_E82A8FE6694DFF4D5ED1869045FE3E0A1855CC3CA65B873F5F1556DABC2DC9F4', but this dictionary requires a model item of type 'MVC_ViewModel.Models.ViewModel'.

Edit page (view):

@model MVC_ViewModel.Models.ViewModel

@{
    ViewBag.Title = "Edit";
}

<h2>Edit</h2>

@using (Html.BeginForm()) {
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true)

    <fieldset>
        <legend>People</legend>

        @Html.HiddenFor(model => model.People.PeopleID)

        <div class="editor-label">
            @Html.LabelFor(model => model.People.Name)
        </div>
        <div class="editor-field">
            @Html.EditorFor(model => model.People.Name)
            @Html.ValidationMessageFor(model => model.People.Name)
        </div>

        <p>
            <input type="submit" value="Save" />
        </p>
    </fieldset>
}

Index page (view):

@model IEnumerable<MVC_ViewModel.People>

@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table>
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.Name)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.Name)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.PeopleID }) |
            @Html.ActionLink("Details", "Details", new { id=item.PeopleID }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.PeopleID })
        </td>
    </tr>
}

</table>

ViewModel class (Model):

namespace MVC_ViewModel.Models
{
    public class ViewModel
    {
        public Car Car { get; set; }
        public List<Car> Cars { get; set; }
        public People People { get; set; }
        public List<People> Peoples { get; set; }
        public Detail Detail { get; set; }
        public List<Detail> Details { get; set; }
    }
}

CRUD (controller):

public ActionResult Index()
{
    return View(db.People.ToList());
}

...

public ActionResult Edit(int id = 0)
{
    People people = db.People.Find(id);
    if (people == null)
    {
        return HttpNotFound();
    }
    return View(people);
}

//
// POST: /CRUDViewModel/Edit/5

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(People people)
{
    if (ModelState.IsValid)
    {
        db.Entry(people).State = EntityState.Modified;
        db.SaveChanges();
        return RedirectToAction("Index");
    }
    return View(people);
}

I need understand the error, if anybody can help me. Thanks!

Charles Mager Charles Mager · Accepted Answer · 2015-04-21T15:24:55

You've specified in your ASP.NET Edit page that your model type is ViewModel:

@model MVC_ViewModel.Models.ViewModel

You then pass it a People object. Nowhere in the code you have provided do you use ViewModel.

If you were to change this to:

@model MVC_ViewModel.People

and change the references from model.People.* to model.*, then the error should go away.

However, I'd suggest you should be returning a PeopleViewModel and mapping various properties to this. It may be useful to go and read some blogs, tutorials and examples of how best to build this.

The model item passed into the dictionary is of type 'System.Data.Entity.DynamicProxies.People', but this dictionary requires a model item of type

1 Answers