Why can't an asp.net mvc strongly typed view use an interface?

Question

Why can't I use this interface to create a strongly typed view?

public interface IAmAnAsset
{
    int assetID { get; }
    String assetTag { get; set; }
    int? AddedBy { get; set; }
    DateTime addedDate { get; set; }
    int? LocationId { get; set; }
    DateTime? purchasedDate { get; set; }
    int? purchasedby { get; set; }
    DateTime? disposalDate { get; set; }
    int assetModelId { get; set; }
    int? employeeId { get; set; }
    float? depreciated { get; set; }
    IAmAComputer Computer { get;  }
}

When I take that exact item and convert to an abstract class, it lets me create a strongly typed view.

I'm new but I would imagine there's something I'm missing, asp.net mvc can work with interfaces, right?

Here's the specific class in the perisistance layer I'm trying to make use of to create a strongly typed view

public class ModelAsset : BufferedLinqEntity2, AssetManagementModel.IAmAnAsset { ... }

I'm trying to create my first mvc view.

Answer 1

ASP.NET works perfectly fine with interfaces:

public interface IAmAnAsset
{
    int AssetID { get; set; }
}

public class AmAnAsset : IAmAnAsset
{
    public int AssetID { get; set; }
}

public class HomeController : Controller
{
    public ActionResult Index()
    {
        IAmAnAsset model = new AmAnAsset { AssetID = 10  };
        return View(model);
    }
}

<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<IAmAnAsset>" %>

<asp:Content ID="indexTitle" ContentPlaceHolderID="TitleContent" runat="server">
    Home Page
</asp:Content>

<asp:Content ID="indexContent" ContentPlaceHolderID="MainContent" runat="server">
    <p><%= Model.AssetID %></p>
</asp:Content>

Answer 2

See this blog post for more information on implementing strongly typed views in ASP.Net MVC.

Answer 3

So what I wound up doing is temporarily changing IAmAnAsset to an abstract class long enough so that the Create View drop down had it available,used that to create the View, then switched it back so the persistance/database layer would compile again.

Here's what it generated for me:

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<IEnumerable<AssetManagementModel.IAmAnAsset>>" %>

<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Assets
</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

<h2>ListAll</h2>

<table>
    <tr>
        <th></th>
        <th>
            assetID
        </th>
        <th>
            assetTag
        </th>
        <th>
            AddedBy
        </th>
        <th>
            addedDate
        </th>
        <th>
            LocationId
        </th>
        <th>
            purchasedDate
        </th>
        <th>
            purchasedby
        </th>
        <th>
            disposalDate
        </th>
        <th>
            assetModelId
        </th>
        <th>
            employeeId
        </th>
        <th>
            depreciated
        </th>
    </tr>

<% foreach (var item in Model) { %>

    <tr>
        <td>
            <%= Html.ActionLink("Edit", "Edit", new { /* id=item.PrimaryKey */ }) %> |
            <%= Html.ActionLink("Details", "Details", new { /* id=item.PrimaryKey */ })%>
        </td>
        <td>
            <%= Html.Encode(item.assetID) %>
        </td>
        <td>
            <%= Html.Encode(item.assetTag) %>
        </td>
        <td>
            <%= Html.Encode(item.AddedBy) %>
        </td>
        <td>
            <%= Html.Encode(String.Format("{0:g}", item.addedDate)) %>
        </td>
        <td>
            <%= Html.Encode(item.LocationId) %>
        </td>
        <td>
            <%= Html.Encode(String.Format("{0:g}", item.purchasedDate)) %>
        </td>
        <td>
            <%= Html.Encode(item.purchasedby) %>
        </td>
        <td>
            <%= Html.Encode(String.Format("{0:g}", item.disposalDate)) %>
        </td>
        <td>
            <%= Html.Encode(item.assetModelId) %>
        </td>
        <td>
            <%= Html.Encode(item.employeeId) %>
        </td>
        <td>
            <%= Html.Encode(item.depreciated) %>
        </td>
    </tr>

<% } %>

</table>

<p>
    <%= Html.ActionLink("Create New", "Create") %>
</p>

</asp:Content>