Question

我正在为大学创建一个MVC网站，我正在尝试显示DropCreateDatabase中的数据，我已经使用DbInitialiser输入了字段。我试图使用调试器来解决这个问题，但我无法解决这个问题。

以下是我的DBInitialiser的一部分：

//override
        protected override void Seed(ApplicationDbContext context)
        {

            var roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(context));
            var userManager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(context));

            // CUSTOMERS
            if (!roleManager.RoleExists("Customer"))
            {
                var role = new IdentityRole();
                role.Name = "Customer";
                roleManager.Create(role);

                string username = "customer1@customer1.com";
                string password = "123456";

                var user = userManager.FindByName(username);

                if (user == null)
                {
                    var newCustomer = new User()
                    {
                        FirstName = "Philip",
                        LastName = "Fry",
                        Town = "Old New York City",
                        Role = "Customer",
                        Email = username,
                        UserName = username,
                        EmailConfirmed = true
                    };
                    userManager.Create(newCustomer, password);
                    userManager.AddToRole(newCustomer.Id, "Customer");
                }
context.SaveChanges();

            //add types of announcements
            context.AnnouncementTypes.Add(
                new AnnouncementType { TypeName = "Movie Review" }
                );

context.SaveChanges();

context.Announcements.Add(
                new Announcement
                {
                    //using FirstOrDefault to make sure it doesn't crash if there is 0
                    //link statement to look for "Movie Review" and return the ProductTypeid
                    AnnouncementType = context.AnnouncementTypes.FirstOrDefault(a => a.TypeName == "Movie Review"),
                    AnnouncementTitle = "Back To The Future Part 4",
                    Description = "A lot better than the 6th one"
                }
                );

base.Seed(context);

这是被调用的控制器的一部分：

private ApplicationDbContext db = new ApplicationDbContext();

// GET: Announcements
public ActionResult Index()
{
    var announcements = db.Announcements.Include(a => a.AnnouncementType);
    return View(announcements.ToList());
}

这是观点，问题似乎在这里：

@model IEnumerable<Theatre.Models.Announcement>

@{
    ViewBag.Title = "Index";
    Layout = "~/Views/Shared/_Layout.cshtml";
}

<h2>Index</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<table class="table">
    <tr>
        <th>
            @Html.DisplayNameFor(model => model.AnnouncementType.TypeName)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.AnnouncementTitle)
        </th>
        <th>
            @Html.DisplayNameFor(model => model.Description)
        </th>
        <th></th>
    </tr>

@foreach (var item in Model) {
    <tr>
        <td>
            @Html.DisplayFor(modelItem => item.AnnouncementType.TypeName)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.AnnouncementTitle)
        </td>
        <td>
            @Html.DisplayFor(modelItem => item.Description)
        </td>
        <td>
            @Html.ActionLink("Edit", "Edit", new { id=item.AnnouncementId }) |
            @Html.ActionLink("Details", "Details", new { id=item.AnnouncementId }) |
            @Html.ActionLink("Delete", "Delete", new { id=item.AnnouncementId })
        </td>
    </tr>
}

</table>

foreach循环没有运行，我认为这是因为Model是空的但我不知道如何。我将此代码基于我为大学所做的另一个项目，它可以正常工作。

Answer 1

看起来你在添加公告后没有调用context.SaveChanges（）。

数据不会显示在我的MVC网站上

1 个答案: