Associating a Model with Multiple Objects

Question

I am working on an administrative panel that will allow the user to add one or more other users. There is a text area in which the administrator can enter one or more user IDs that must be added to the application, which corresponds to the user ID assigned during the employment process. When presented, the application pulls out a name, email address, etc. From a database containing all employees and displays it on the screen for verification. Also on the screen there are some flags for assigning some permissions, such as CanWriteand IsAdmin.

View

using (Html.BeginForm())
        {
            <table>
                <tr>
                    <th>
                    </th>
                    <th>
                        @Html.DisplayNameFor(model => model.User.First().ID)
                    </th>
                    <th>
                        @Html.DisplayNameFor(model => model.User.First().Name)
                    </th>
                    <th>
                        @Html.DisplayNameFor(model => model.User.First().Email)
                    </th>
                    <th>
                        @Html.DisplayNameFor(model => model.User.First().CanWrite)
                    </th>
                    <th>
                        @Html.DisplayNameFor(model => model.User.First().IsAdmin)
                    </th>
                </tr>

                @foreach (var item in Model.User)
                {
                    <tr>
                        <td>
                            <input type="checkbox" name="id" value="@item.ID" checked=checked/>
                        </td>
                        <td>
                            @Html.DisplayFor(modelItem => item.ID)
                        </td>
                        <td>
                            @Html.DisplayFor(modelItem => item.Name)
                        </td>
                        <td>
                            @Html.DisplayFor(modelItem => item.Email)
                        </td>
                        <td>
                            @Html.CheckBoxFor(modelItem => item.CanWrite)
                        </td>
                        <td>
                            @Html.CheckBoxFor(modelItem => item.IsAdmin)
                        </td>
                    </tr>
                }

            </table>
            <input type="submit" />
        }

. ID , , , , , . .

Model

public class User
{
    public int ID { set; get; }
    public string Name { set; get; }
    public bool IsAdmin { set; get; }
    public bool CanWrite { set; get; }
    public string Email{ set; get; }

}

[HttpPost]
public ActionResult Create(IEnumerable<User> model)
{
    //With this code, model shows up as null
}

, , User model . , ? ?

Answer 1

, . , .

-, , null , , . :

<input id="item_CanWrite" name="item.CanWrite" type="checkbox" value="true" />
<input name="item.CanWrite" type="hidden" value="false" />

, name - item.CanWrite. , , , . MVC POSTed, User.

, Html.DisplayFor, MVC User , User . . :

@for (int i = 0; i < Model.Count(); i++)
{
    <tr>
        <td>
            <input type="checkbox" name="id" value="@Model[i].ID" checked=checked/>
        </td>
        <td>
            @Html.DisplayFor(m => m[i].ID)
        </td>
        <td>
            @Html.DisplayFor(m => m[i].Name)
        </td>
        <td>
            @Html.DisplayFor(m => m[i].Email)
        </td>
        <td>
            @Html.CheckBoxFor(m => m[i].CanWrite)
        </td>
        <td>
            @Html.CheckBoxFor(m => m[i].IsAdmin)
        </td>
    </tr>
}

, HTML, , :

<input checked="checked" data-val="true" data-val-required="The CanWrite field is required." name="[0].CanWrite" type="checkbox" value="true" />
<input name="[0].CanWrite" type="hidden" value="false" />
<input checked="checked" data-val="true" data-val-required="The CanWrite field is required." name="[1].CanWrite" type="checkbox" value="true" />
<input name="[1].CanWrite" type="hidden" value="false" />

, User . , :

[HttpPost]
public ActionResult Index(IEnumerable<User> model)
{
    // Process your data.

    return View(model);
}

, , , . DisplayTemplates :

• DisplayTemplates (, Home\Index.cshtml, Home\DisplayTemplates).
• , (.. User.cshtml).
• .

( , User):

@model User

<tr>
    <td>
        <input type="checkbox" name="id" value="@Model.ID" checked=checked/>
    </td>
    <td>
        @Html.DisplayFor(m => m.ID)
    </td>
    <td>
        @Html.DisplayFor(m => m.Name)
    </td>
    <td>
        @Html.DisplayFor(m => m.Email)
    </td>
    <td>
        @Html.CheckBoxFor(m => m.CanWrite)
    </td>
    <td>
        @Html.CheckBoxFor(m => m.IsAdmin)
    </td>
</tr>

, , :

@using (Html.BeginForm())
{
    <table>
        @Html.DisplayForModel()
    </table>
    <input type="submit" value="Submit" />
}

, . .

Answer 2

ASP.NET MVC, , , IEnumerable<User>, . POST.

Answer 3

Try something like this:

Model

public class Employee
{
    public IEnumerable<User> Employees { set; get; }
}

public class User
{
    public int ID { set; get; }
    public string Name { set; get; }
    public bool IsAdmin { set; get; }
    public bool CanWrite { set; get; }
    public string Email{ set; get; }
}

View

@model Employee

@using( Html.BeginForm()
{
    // build HTML table, not much different from yours
}

controller

[HttpPost]
public ActionResult Create(Employee model)
{
    // model will have an IEnumerable property with the User info
}