Razor中ICollection <>中的ICollection <>-无法检索模型名称

Question

I'm wondering how to resolve the problem. I'm developing an ASP.NET MVC app

I have a models

public class SearcherString
{
    public int ID { get; set; }
    public string Description { get; set; }
    public virtual ICollection<Path> Path { get; set; 
    public SearcherString()
    {
        Path = new List<Path>();
    }
}

public class Path
{
    public int ID { get; set; }
    public int CategoryID { get; set; }
    public string CategoryName { get; set; }
}

I'm passing it in my Controller (I'm writing my model into my database and then I'm retrieving it)

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

And I have a View with:

@model IEnumerable<App.Models.SearcherString>

The problem is in my View, I can't display the names from Path model ( CategoryID , CategoryName )

I tried to do:

<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.Description)
        </th>
        @foreach (var item in Model)
        {
            foreach (var path in item.Path)
            {
                <th>
                    @Html.DisplayName(path.CategoryID.ToString())
                </th>
                <th>
                    @Html.DisplayName(path.CategoryName)
                </th>
            }
        }
        <th></th>
    </tr>

    @foreach (var item in Model)
    {
        <tr>
            <td>
                @Html.DisplayFor(modelItem => item.Description)
            </td>
            @foreach (var path in item.Path)
            {
                <td>
                    @Html.DisplayFor(modelItem => path.CategoryID)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => path.CategoryName)
                </td>
            }
            <td>
                @Html.ActionLink("Edit", "Edit", new { id = item.ID }) |
                @Html.ActionLink("Details", "Details", new { id = item.ID }) |
                @Html.ActionLink("Delete", "Delete", new { id = item.ID })
            </td>
        </tr>
    }
</table>

But I have only:

Could someone help me with this problem?

Edit:

Is there a way to change the Html.DisplayName to Html.DisplayNameFor here?

@Html.DisplayName(path.CategoryID.ToString())

Answer 1

You should include navigation property to your query:

public ActionResult Index()
{
    return View(db.SearchersString.Include(c=>c.Path).ToList()
}

Answer 2

Your Model is incorrect.

public SearcherString()
{
    Path = new List<Path>();
}

This is not a property. This is treated as a Method, a special one. And it is a constructor. That Creates a Path object That is EMPTY.

If you want to have a one to many relationship. You would have to use the property for this and add a property of ID.

public int PathID {get; set;}
public virtual Path Path{get; set;}

Now you have a lazy loading property that will automatically save the ID property of the Path class into your SearchString model property PathID.

to get the PathID, you will specifically need to call the include function if you're using EntityFramework, which most likely the case.

public ActionResult Index(){


  return View(db.SearchersString.Include(c=>c.Path).ToList();
}