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更改主鍵后的路由問題

[英]Routing issue after changing primary keys

將主鍵從ID更改為PostId ,似乎Post Details.cshtml視圖無法正確呈現URL。

如果我導航到https://localhost:xxxxx/Posts/Details/4 ,則頁面將正確呈現。 但是,以前運行的Index.cshtml視圖中的@Html.ActionLink調用現在不再起作用。 它指向https://localhost:xxxxx/Posts/Details?PostId=4 ,這是一個空白頁。 URL似乎應該起作用,但是,我不確定路由是問題還是與視圖有關。 單獨的類(也更改了其主鍵)時,也會發生相同的問題。

Index.cshtml視圖<a asp-action="Details" asp-route-id="@item.PostId">Details</a>鏈接通過指向https://localhost:xxxxx/Posts/Details/4起作用https://localhost:xxxxx/Posts/Details/4

Index.cshtml

@model IEnumerable<Website.Models.Post>

<table class="table">
    <thead>
        <tr>
            <th>
                <a asp-action="Index" asp-route-sortOrder="@ViewData["TitleSortParm"]">@Html.DisplayNameFor(model => model.Title)</a>
            </th>
            <th>
                <a asp-action="Index" asp-route-sortOrder="@ViewData["AuthorSortParm"]">@Html.DisplayNameFor(model => model.Author.LastName)</a>
            </th>
            <th>Actions</th>
        </tr>
    </thead>
    <tbody>
        @foreach (var item in Model)
        {
            <tr>
                <td>
                    @Html.ActionLink(item.Title, "Details", "Posts", new { item.PostId })
                </td>
                <td>
                    @Html.ActionLink(item.Author.FullName, "Details", "Authors", new { item.Author.AuthorId })
                </td>
                <td>
                    <a asp-action="Edit" asp-route-id="@item.PostId">Edit</a> |
                    <a asp-action="Details" asp-route-id="@item.PostId">Details</a> |
                    <a asp-action="Delete" asp-route-id="@item.PostId">Delete</a>
                </td>
            </tr>
        }
    </tbody>
</table>

PostsController.cs (僅相關Details get方法)

namespace Website.Controllers
{
    public class PostsController : Controller
    {
        private readonly Website.Data.ApplicationDbContext _context;

        public PostsController(Website.Data.ApplicationDbContext context)
        {
            _context = context;
        }


        // GET: Post/Details/5
        public async Task<IActionResult> Details(int? id)
        {
            if (id == null)
            {
                return NotFound();
            }

            var post = await _context.Post
                .Include(p => p.Author)
                .FirstOrDefaultAsync(m => m.PostId == id);
            if (post == null)
            {
                return NotFound();
            }

            return View(post);
        }
    }
}

Post.cs

namespace Website.Models
{
    public class Post   // dependent on Author
    {
        public int PostId { get; set; } // primary key
        public string Title { get; set; }
        public string Description { get; set; }
        public DateTime PublicationDate { get; set; }

        public int AuthorId { get; set; }   // author foreign key
        public Author Author { get; set; }  // author navigation property

        public ICollection<Tag> Tags { get; set; }
    }
}

在Startup.cs中,路由信息(從未更改,只是默認設置):

app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });

您的動作參數名為id 當您將點與命名參數一起使用時,例如https://localhost:xxxxx/Posts/Details?PostId=4 MVC會嘗試將PostId序列化為具有相同名稱的參數。 您可以重命名參數或使用前綴。

Task<IActionResult> Details([Bind(Prefix="PostId")] int? id)

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