我遇到了错误的例外情况

Question

我是新学习的asp.net core，我得到了一个错误：

我一直在搜索解决方案i Internet，但没有得到任何结果。谁能帮我吗？这是我的代码：

details.cshtml

@model SixthApp.Models.Customer

@{
    ViewData["Title"] = "Details";
}

<h1>Details</h1>

<div>
    <h4>Customer</h4>
    <p>@ViewData["data"]</p>

    <hr />
    <dl class="row">
        <dt class = "col-sm-2">
            @Html.DisplayNameFor(model => model.CustomerId)
        </dt>
        <dd class = "col-sm-10">
            @Html.DisplayFor(model => model.CustomerId)
        </dd>
        <dt class = "col-sm-2">
            @Html.DisplayNameFor(model => model.Name)
        </dt>
        <dd class = "col-sm-10">
            @Html.DisplayFor(model => model.Name)
        </dd>
        <dt class = "col-sm-2">
            @Html.DisplayNameFor(model => model.Address)
        </dt>
        <dd class = "col-sm-10">
            @Html.DisplayFor(model => model.Address)
        </dd>
        <dt class = "col-sm-2">
            @Html.DisplayNameFor(model => model.MobileNo)
        </dt>
        <dd class = "col-sm-10">
            @Html.DisplayFor(model => model.MobileNo)
        </dd>
    </dl>
</div>
<div>
    @Html.ActionLink("Edit", "Edit", new { /* id = Model.PrimaryKey */ }) |
    <a asp-action="Index">Back to List</a>
</div>

这是customercontroller.cs中的详细方法

        public IActionResult Details(int? Id)
        {
            var DataCustomer = _conn.tabel_customer.Where(c => c.CustomerId == Id).ToList();

            return View(DataCustomer);
        }

Answer 1

 公共iRinctionResult详细信息（int？id）
    {
        var dataCustomer = _conn.tabel_customer.Where（c =＆gt; c.customerid == id）.tolist（）;

        返回视图（DataCustomer）;
    }
 

您的视图需求是模型，您在操作中返回视图的内容是list

尝试以下代码：

    public async Task<IActionResult> Details(int? Id)
    {
        var DataCustomer =  await _conn.tabel_customer.FirstOrDefaultAsync(c => c.CustomerId == Id);

        return View(DataCustomer);
    }

Answer 2

您正在返回对象列表，并查看期望一个对象。
您应该，要么将控制器更改为这样的东西，要返回单个对象：

public IActionResult Details(int? Id)
{
    var DataCustomer = _conn.tabel_customer.Where(c => c.CustomerId == Id).FirstOrDefault();

    return View(DataCustomer);
}

或将模型更改为@model iEnumerable＆lt; sixthapp.models.models.customer＆gt;，并在视图上循环槽以显示所有对象从控制器...