c# - 传递到字典中的模型项的类型为 '`，但此字典需要类型为 'System.Collections.Generic.IEnumerable' 的模型项

Question

我在这里使用 MVC 中的 WCf 服务并从该服务中检索值并尝试在 View 中显示它。出现错误:

The model item passed into the dictionary is of type 'System.Collections.Generic.List` but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable'

服务代码:

public IList<AddressDetails> GetAddressDetails(string addressid)
        {
            List<AddressDetails> addressdetails = new List<AddressDetails>();
             {
                con.Open();
                SqlCommand cmd = new SqlCommand("select Name,EmailAddress,Line1,City from Address where addressid ='6742596A-F413-4C71-8BAB-0016F96B56A0'", con);
                SqlDataAdapter da = new SqlDataAdapter(cmd);
                DataTable dt = new DataTable();
                da.Fill(dt);
                if (dt.Rows.Count > 0)
                {
                    for (int i = 0; i < dt.Rows.Count; i++)
                    {
                        AddressDetails addressInfo = new AddressDetails();
                        //addressInfo.Addressid = dt.Rows[i]["Addressid"].ToString();
                        addressInfo.Name = dt.Rows[i]["Name"].ToString();
                        addressInfo.EmailAddress = dt.Rows[i]["EmailAddress"].ToString();
                        addressInfo.Line1 = dt.Rows[i]["Line1"].ToString();
                        addressInfo.City = dt.Rows[i]["City"].ToString();
                        addressdetails.Add(addressInfo);
                    }
                }
                con.Close();
            }
            return addressdetails;
        }

Controller 代码:

ServiceReference1.Service1Client objService = new ServiceReference1.Service1Client();
        public ActionResult sample()
        {
            IList<AddressDetails> objAddressDetails = new List<AddressDetails>();
            objAddressDetails = objService.GetAddressDetails("");
            return View(objAddressDetails.ToList());
        }

查看代码:

@model IEnumerable<Magelia.WebStore.StarterSite.Web.Models.Sample.SampleViewModel>

@{
    ViewBag.Title = "sample";
}

<h2>sample</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table>
    <tr>
        <th>
            AddressId
        </th>
        <th>
            Name
        </th>
        <th>
            EmailAddress
        </th>
        <th>
            Line1
        </th>
        <th>
            City
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.AddressId)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Name)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.EmailAddress)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Line1)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.City)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { /* id=item.PrimaryKey */ }) |
            @Html.ActionLink("Details", "Details", new { /* id=item.PrimaryKey */ }) |
            @Html.ActionLink("Delete", "Delete", new { /* id=item.PrimaryKey */ })
        </td>
    </tr>
}

</table>

有什么建议吗？

Answer 1

线索就在你错过问题的地方 - View 中序列的预期元素类型，以及列表的元素类型。

这是您在模型中创建的内容:

IList<AddressDetails> objAddressDetails = new List<AddressDetails>();

但这是模型声明它需要的:

@model IEnumerable<Magelia.WebStore.StarterSite.Web.Models.Sample.SampleViewModel>

你应该有

@model IEnumerable<AddressDetails>

我的猜测是您没有看就复制并粘贴了模型声明 - 始终确保您理解复制和粘贴内容的每一行。