Question

我在mvc 4中使用petapoco orm。当我要从数据库表中显示我的总客户列表时，它显示我未设置的对象引用和对象的实例。我的客户端表中也有一些数据或信息。为什么会出现此错误，请帮帮我... 我的索引视图是。

@model IEnumerable<FCBook.Client>

@{
    ViewBag.Title = "Client list";
}

<h2>Index</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table>
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.ClientName)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.ContactName)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.PhoneNo)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Fax)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Email)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Address)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.City)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.PostalCode)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Country)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.ClientName)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.ContactName)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.PhoneNo)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Fax)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Email)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Address)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.City)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.PostalCode)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Country)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.ClientId }) |
            @Html.ActionLink("Details", "Details", new { id=item.ClientId }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.ClientId })
        </td>
    </tr>
}

</table>

控制器：

public ActionResult Create()
        {
            return View();
        }

        //
        // POST: /Client/Create

        [Httppost]
        public ActionResult Create(Client collection)
        {
            try
            {
                // TODO: Add insert logic here
                var db = new PetaPoco.Database("FCbook");
                if (collection != null)
                {
                    collection.Insert();
                }

                return RedirectToAction("Index");
            }
            catch
            {
                return View();
            }
        }

Answer 1

Index方法的控制器

public ActionResult Index()
 { 
    var db = new PetaPoco.Database("FCBook"); 
    var Cllist = db.Query<Client>("Select * from Client"); 
    if (Cllist != null)
     { 
        //Convert your Cllist into list of your Model i.e List<FCBook.Client>
        return View(Cllist);
     }
   else
     {
       return RedirectToAction("");
     } 
}

Answer 2

您的视图需要模型@model IEnumerable<FCBook.Client>。但是在调用return View();时你没有传递模型。我看到您希望通过Client方法显示GET列表。

而不是

public ActionResult Create()
{
    return View();
}

应该是

public ActionResult Create()
{
    //connect to datasource and query for Client list
    model = ...

    return View(model);
}

有关MVC4的详细信息，请参阅this

为什么我的数据没有在MVC 4中显示？

2 个答案: