Question

我正在开发一个ASP.NET MVC应用程序，最近，我的数据库中的一个表不再显示其外键，我不能为我的生活找出原因。数据库中有其他表引用与此相同的表，并且它们工作正常，但由于某种原因，现在显示为空白。其他表使用非常相似的代码，这就是为什么我特别难过。我甚至尝试删除并重新构建控制器和视图，并在将@Html.DisplayFor(modelItem => item.Ref)更改为类似@Html.DisplayFor(modelItem => item.Product.ProductID)之类的内容时产生同样的问题。

编辑：
我首先使用EF代码，遗憾的是重新播种我的数据库并没有帮助。如果我展示我的上下文类会有帮助吗？

第二次编辑：
我解决了这个问题，在我的上下文类中，我将每个外键声明为可选，这出于某种原因意味着它们根本没有显示。删除后，现在一切正常。

控制器代码：

        public ActionResult Index(string sortOrder, string currentFilter, string searchString, int? page)
        {
            ViewBag.CurrentSort = sortOrder;
            ViewBag.IDSortParam = String.IsNullOrEmpty(sortOrder) ? "ID_desc" : "";
            ViewBag.RefSortParam = sortOrder == "Ref" ? "Ref_desc" : "Ref";
            ViewBag.ProdNameSortParam = sortOrder == "ProdName" ? "ProdName_desc" : "ProdName";
            ViewBag.UnitPriceSortParam = sortOrder == "UnitPrice" ? "UnitPrice_desc" : "UnitPrice";
            ViewBag.FormatSortParam = sortOrder == "Format" ? "Format_desc" : "Format";
            ViewBag.QuantitySortParam = sortOrder == "Quantity" ? "Quantity_desc" : "Quantity";
            ViewBag.AvailabilitySortParam = sortOrder == "Availability" ? "Availability_desc" : "Availability";
            ViewBag.NewSortParam = sortOrder == "New" ? "New_desc" : "New";
            ViewBag.LocationSortParam = sortOrder == "Location" ? "Location_desc" : "Location";
            ViewBag.OrigNoSortParam = sortOrder == "OrigNo" ? "OrigNo_desc" : "OrigNo";
            ViewBag.TitleSortParam = sortOrder == "Title" ? "Title_desc" : "Title";
            ViewBag.ShortTitleSortParam = sortOrder == "ShortTitle" ? "ShortTitle_desc" : "ShortTitle";
            ViewBag.LinkSortParam = sortOrder == "Link" ? "Link_desc" : "Link";
            ViewBag.NotesSortParam = sortOrder == "Notes" ? "Notes_desc" : "Notes";
            ViewBag.Notes2SortParam = sortOrder == "Notes2" ? "Notes2_desc" : "Notes2";
            ViewBag.TypeSortParam = sortOrder == "Type" ? "Type_desc" : "Type";
            ViewBag.SerTitleSortParam = sortOrder == "SerTitle" ? "SerTitle_desc" : "SerTitle";
            ViewBag.SubjectSortParam = sortOrder == "Subject" ? "Subject_desc" : "Subject";
            ViewBag.ClassSubjSortParam = sortOrder == "ClassSubj" ? "ClassSubj_desc" : "ClassSubj";
            ViewBag.ClassGeogSortParam = sortOrder == "ClassGeog" ? "ClassGeog_desc" : "ClassGeog";
            ViewBag.ClassLangSortParam = sortOrder == "ClassLang" ? "ClassLang_desc" : "ClassLang";
            ViewBag.ClassDateSortParam = sortOrder == "ClassDate" ? "ClassDate_desc" : "ClassDate";
            ViewBag.RelName1SortParam = sortOrder == "RelName1" ? "RelName1_desc" : "RelName1";
            ViewBag.RelName2SortParam = sortOrder == "RelName2" ? "RelName2_desc" : "RelName2";
            ViewBag.RelName3SortParam = sortOrder == "RelName3" ? "RelName3_desc" : "RelName3";
            ViewBag.RelName4SortParam = sortOrder == "RelName4" ? "RelName4_desc" : "RelName4";
            ViewBag.RelTit1SortParam = sortOrder == "RelTit1" ? "RelTit1_desc" : "RelTit1";
            ViewBag.RelTit2SortParam = sortOrder == "RelTit2" ? "RelTit2_desc" : "RelTit2";
            ViewBag.RelTit3SortParam = sortOrder == "RelTit3" ? "RelTit3_desc" : "RelTit2";

            if (searchString != null)
            {
                page = 1;
            }
            else
            {
                searchString = currentFilter;
            }

            ViewBag.CurrentFilter = searchString;

            var catalogs = from c in db.Catalogs//.Include(c => c.BicFull).Include(c => c.BicFull2).Include(c => c.BicFull3).Include(c => c.BicFull4).Include(c => c.Product).Include(c => c.RelatedName).Include(c => c.RelatedName2).Include(c => c.RelatedName3).Include(c => c.RelatedName4).Include(c => c.RelatedTitle).Include(c => c.RelatedTitle2).Include(c => c.RelatedTitle3).Include(c => c.RelatedTitle4).Include(c => c.Series)
                           select c;

            if (!String.IsNullOrEmpty(searchString))
            {
                catalogs = catalogs.Where(s => s.Ref.ToUpper().Contains(searchString.ToUpper()) ||
                                          s.ProductID.ToUpper().Contains(searchString.ToUpper()) ||
                                          s.Format.ToUpper().Contains(searchString.ToUpper()));
            }

            switch (sortOrder)
            {
                case "ID_desc":
                    catalogs = catalogs.OrderByDescending(s => s.CatalogID);
                    break;
                case "Ref":
                    catalogs = catalogs.OrderBy(s => s.Ref);
                    break;
                case "Ref_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Ref);
                    break;
                case "ProdName":
                    catalogs = catalogs.OrderBy(s => s.ProductID);
                    break;
                case "ProdName_desc":
                    catalogs = catalogs.OrderByDescending(s => s.ProductID);
                    break;
                case "UnitPrice":
                    catalogs = catalogs.OrderBy(s => s.UnitPrice);
                    break;
                case "UnitPrice_desc":
                    catalogs = catalogs.OrderByDescending(s => s.UnitPrice);
                    break;
                case "Format":
                    catalogs = catalogs.OrderBy(s => s.Format);
                    break;
                case "Format_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Format);
                    break;
                case "Quantity":
                    catalogs = catalogs.OrderBy(s => s.Quantity);
                    break;
                case "Quantity_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Quantity);
                    break;
                case "Availability":
                    catalogs = catalogs.OrderBy(s => s.Availability);
                    break;
                case "Availability_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Availability);
                    break;
                case "New":
                    catalogs = catalogs.OrderBy(s => s.New);
                    break;
                case "New_desc":
                    catalogs = catalogs.OrderByDescending(s => s.New);
                    break;
                case "Location":
                    catalogs = catalogs.OrderBy(s => s.Location);
                    break;
                case "Location_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Location);
                    break;
                case "OrigNo":
                    catalogs = catalogs.OrderBy(s => s.OriginalNo);
                    break;
                case "OrigNo_desc":
                    catalogs = catalogs.OrderByDescending(s => s.OriginalNo);
                    break;
                case "Title":
                    catalogs = catalogs.OrderBy(s => s.Title);
                    break;
                case "Title_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Title);
                    break;
                case "ShortTitle":
                    catalogs = catalogs.OrderBy(s => s.ShortTitle);
                    break;
                case "ShortTitle_desc":
                    catalogs = catalogs.OrderByDescending(s => s.ShortTitle);
                    break;
                case "Link":
                    catalogs = catalogs.OrderBy(s => s.Link);
                    break;
                case "Link_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Link);
                    break;
                case "Notes":
                    catalogs = catalogs.OrderBy(s => s.Notes);
                    break;
                case "Notes_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Notes);
                    break;
                case "Notes2":
                    catalogs = catalogs.OrderBy(s => s.Notes2);
                    break;
                case "Notes2_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Notes2);
                    break;
                case "Type":
                    catalogs = catalogs.OrderBy(s => s.Type);
                    break;
                case "Type_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Type);
                    break;
                case "SerTitle":
                    catalogs = catalogs.OrderBy(s => s.SeriesID);
                    break;
                case "SerTitle_desc":
                    catalogs = catalogs.OrderByDescending(s => s.SeriesID);
                    break;
                case "Subject":
                    catalogs = catalogs.OrderBy(s => s.Subject);
                    break;
                case "Subject_desc":
                    catalogs = catalogs.OrderByDescending(s => s.Subject);
                    break;
                case "ClassSubj":
                    catalogs = catalogs.OrderBy(s => s.ClassSubj);
                    break;
                case "ClassSubj_desc":
                    catalogs = catalogs.OrderByDescending(s => s.ClassSubj);
                    break;
                case "ClassGeog":
                    catalogs = catalogs.OrderBy(s => s.ClassGeog);
                    break;
                case "ClassGeog_desc":
                    catalogs = catalogs.OrderByDescending(s => s.ClassGeog);
                    break;
                case "ClassLang":
                    catalogs = catalogs.OrderBy(s => s.ClassLang);
                    break;
                case "ClassLang_desc":
                    catalogs = catalogs.OrderByDescending(s => s.ClassLang);
                    break;
                case "ClassDate":
                    catalogs = catalogs.OrderBy(s => s.ClassDate);
                    break;
                case "ClassDate_desc":
                    catalogs = catalogs.OrderByDescending(s => s.ClassDate);
                    break;
                case "RelName1":
                    catalogs = catalogs.OrderBy(s => s.RelatedNames1);
                    break;
                case "RelName1_desc":
                    catalogs = catalogs.OrderByDescending(s => s.RelatedNames1);
                    break;
                case "RelName2":
                    catalogs = catalogs.OrderBy(s => s.RelatedNames2);
                    break;
                case "RelName2_desc":
                    catalogs = catalogs.OrderByDescending(s => s.RelatedNames2);
                    break;
                case "RelName3":
                    catalogs = catalogs.OrderBy(s => s.RelatedNames3);
                    break;
                case "RelName3_desc":
                    catalogs = catalogs.OrderByDescending(s => s.RelatedNames3);
                    break;
                case "RelName4":
                    catalogs = catalogs.OrderBy(s => s.RelatedNames4);
                    break;
                case "RelName4_desc":
                    catalogs = catalogs.OrderByDescending(s => s.RelatedNames4);
                    break;
                case "RelTit1":
                    catalogs = catalogs.OrderBy(s => s.RelatedTitles1);
                    break;
                case "RelTit1_desc":
                    catalogs = catalogs.OrderByDescending(s => s.RelatedTitles1);
                    break;
                case "RelTit2":
                    catalogs = catalogs.OrderBy(s => s.RelatedTitles2);
                    break;
                case "RelTit2_desc":
                    catalogs = catalogs.OrderByDescending(s => s.RelatedTitles2);
                    break;
                case "RelTit3":
                    catalogs = catalogs.OrderBy(s => s.RelatedTitles3);
                    break;
                case "RelTit3_desc":
                    catalogs = catalogs.OrderByDescending(s => s.RelatedTitles3);
                    break;
                default:
                    catalogs = catalogs.OrderBy(s => s.CatalogID);
                    break;
            }
            int pageSize = 10;
            int pageNumber = (page ?? 1);
            return View(catalogs.ToPagedList(pageNumber, pageSize));

目录模型：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace Microform_Intranet.Models
{
    public class Catalog
    {
        [Display(Name="Catalog ID")]
        public int CatalogID { get; set; }

        [ForeignKey("Product")]
        public string Ref { get; set; }

        [Display(Name="Product Name")]
        [ForeignKey("Product2")]
        public string ProductID { get; set; }

        [Display(Name="Unit Price")]
        [DisplayFormat(ApplyFormatInEditMode = true, DataFormatString = "{0:c}")]
        public decimal? UnitPrice { get; set; }
        public string Format { get; set; }
        public string Quantity { get; set; }
        public string Availability { get; set; }
        public string New { get; set; }
        public string Location { get; set; }

        [Display(Name="Original No.")]
        public string OriginalNo { get; set; }
        public string Title { get; set; }

        [ForeignKey("RelatedTitle4")]
        public int? ShortTitle { get; set; }
        public string Link { get; set; }
        public string Notes { get; set; }

        [Display(Name="Notes 2")]
        public string Notes2 { get; set; }
        public string Type { get; set; }

        [Display(Name="Series Title")]
        public int? SeriesID { get; set; }
        public string Subject { get; set; }

        [ForeignKey("BicFull")]
        public string ClassSubj { get; set; }

        [ForeignKey("BicFull2")]
        public string ClassGeog { get; set; }

        [ForeignKey("BicFull3")]
        public string ClassLang { get; set; }

        [ForeignKey("BicFull4")]
        public string ClassDate { get; set; }

        [ForeignKey("RelatedName")]
        public int? RelatedNames1 { get; set; }

        [ForeignKey("RelatedName2")]
        public int? RelatedNames2 { get; set; }

        [ForeignKey("RelatedName3")]
        public int? RelatedNames3 { get; set; }

        [ForeignKey("RelatedName4")]
        public int? RelatedNames4 { get; set; }

        [ForeignKey("RelatedTitle")]
        public int? RelatedTitles1 { get; set; }

        [ForeignKey("RelatedTitle2")]
        public int? RelatedTitles2 { get; set; }

        [ForeignKey("RelatedTitle3")]
        public int? RelatedTitles3 { get; set; }

        public virtual Product Product { get; set; }
        public virtual Product Product2 { get; set; }
        public virtual Series Series { get; set; }
        public virtual BicFull BicFull { get; set; }
        public virtual BicFull BicFull2 { get; set; }
        public virtual BicFull BicFull3 { get; set; }
        public virtual BicFull BicFull4 { get; set; }
        public virtual RelatedName RelatedName { get; set; }
        public virtual RelatedName RelatedName2 { get; set; }
        public virtual RelatedName RelatedName3 { get; set; }
        public virtual RelatedName RelatedName4 { get; set; }
        public virtual RelatedTitle RelatedTitle { get; set; }
        public virtual RelatedTitle RelatedTitle2 { get; set; }
        public virtual RelatedTitle RelatedTitle3 { get; set; }
        public virtual RelatedTitle RelatedTitle4 { get; set; }
    }
}

目录索引视图：

@model PagedList.IPagedList<Microform_Intranet.Models.Catalog>
@using PagedList.Mvc;
<link href="~/Content/PagedList.css" rel="stylesheet" type="text/css" />

@{
    ViewBag.Title = "Index";
}

<h2>Catalog</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
@using (Html.BeginForm("Index", "Catalog", FormMethod.Get))
{
    <p>
        Find by Ref, Product Name or Format: @Html.TextBox("searchString", ViewBag.CurrentFilter as string)
        <input type="submit" value="Search" />
    </p>
}
<div class="datatable" style="overflow-x:scroll">
    <table class="table" style="table-layout:fixed">
        <tr>
            <th style="width:90px">
                @Html.ActionLink("Catalog ID", "Index", new { sortOrder = ViewBag.IDSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:125px">
                @Html.ActionLink("Ref", "Index", new { sortOrder = ViewBag.RefSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:300px">
                @Html.ActionLink("Product Name", "Index", new { sortOrder = ViewBag.ProdNameSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:100px">
                @Html.ActionLink("Unit Price", "Index", new { sortOrder = ViewBag.UnitPriceSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:150px">
                @Html.ActionLink("Format", "Index", new { sortOrder = ViewBag.FormatSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:75px">
                @Html.ActionLink("Quantity", "Index", new { sortOrder = ViewBag.QuantitySortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:150px">
                @Html.ActionLink("Availability", "Index", new { sortOrder = ViewBag.AvailabilitySortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:120px">
                @Html.ActionLink("New", "Index", new { sortOrder = ViewBag.NewSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:200px">
                @Html.ActionLink("Location", "Index", new { sortOrder = ViewBag.LocationSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:150px">
                @Html.ActionLink("Original No.", "Index", new { sortOrder = ViewBag.OrigNoSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:400px">
                @Html.ActionLink("Title", "Index", new { sortOrder = ViewBag.TitleSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:300px">
                @Html.ActionLink("Short Title", "Index", new { sortOrder = ViewBag.ShortTitleSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:350px">
                @Html.ActionLink("Link", "Index", new { sortOrder = ViewBag.LinkSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:1000px">
                @Html.ActionLink("Notes", "Index", new { sortOrder = ViewBag.NotesSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:350px">
                @Html.ActionLink("Notes 2", "Index", new { sortOrder = ViewBag.Notes2SortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:150px">
                @Html.ActionLink("Type", "Index", new { sortOrder = ViewBag.TypeSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:200px">
                @Html.ActionLink("Series Title", "Index", new { sortOrder = ViewBag.SerTitleSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:200px">
                @Html.ActionLink("Subject", "Index", new { sortOrder = ViewBag.SubjectSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:200px">
                @Html.ActionLink("Class Subject", "Index", new { sortOrder = ViewBag.ClassSubjSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:300px">
                @Html.ActionLink("Class Geography", "Index", new { sortOrder = ViewBag.ClassGeogSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:300px">
                @Html.ActionLink("Class Language", "Index", new { sortOrder = ViewBag.ClassLangSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:200px">
                @Html.ActionLink("Class Date", "Index", new { sortOrder = ViewBag.ClassDateSortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:250px">
                @Html.ActionLink("Related Names 1", "Index", new { sortOrder = ViewBag.RelName1SortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:250px">
                @Html.ActionLink("Related Names 2", "Index", new { sortOrder = ViewBag.RelName2SortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:250px">
                @Html.ActionLink("Related Names 3", "Index", new { sortOrder = ViewBag.RelName3SortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:250px">
                @Html.ActionLink("Related Names 4", "Index", new { sortOrder = ViewBag.RelName4SortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:250px">
                @Html.ActionLink("Related Titles 1", "Index", new { sortOrder = ViewBag.RelTit1SortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:250px">
                @Html.ActionLink("Related Titles 2", "Index", new { sortOrder = ViewBag.RelTit2SortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:250px">
                @Html.ActionLink("Related Titles 3", "Index", new { sortOrder = ViewBag.RelTit3SortParam, currentFilter = ViewBag.CurrentFilter })
            </th>
            <th style="width:150px"></th>
        </tr>

        @foreach (var item in Model)
        {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.CatalogID)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Product.ProductID)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Product2.ProductName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.UnitPrice)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Format)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Quantity)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Availability)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.New)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Location)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.OriginalNo)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Title)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.RelatedTitle4.RelatedTitleName)
                </td>
                <td>
                    <a href="@Html.DisplayFor(modelItem => item.Link)" target="_blank">@Html.DisplayFor(modelItem => item.Link)</a>
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Notes)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Notes2)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Type)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Series.SeriesName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Subject)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.BicFull.BicFullName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.BicFull2.BicFullName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.BicFull3.BicFullName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.BicFull4.BicFullName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.RelatedName.RelatedNameName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.RelatedName2.RelatedNameName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.RelatedName3.RelatedNameName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.RelatedName4.RelatedNameName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.RelatedTitle.RelatedTitleName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.RelatedTitle2.RelatedTitleName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.RelatedTitle3.RelatedTitleName)
                </td>
                <td>
                    @Html.ActionLink("Edit", "Edit", new { id = item.CatalogID }) |
                    @Html.ActionLink("Details", "Details", new { id = item.CatalogID }) |
                    @Html.ActionLink("Delete", "Delete", new { id = item.CatalogID })
                </td>
            </tr>
        }

    </table>
</div>
<br />
Page @(Model.PageCount < Model.PageNumber ? 0 : Model.PageNumber) of @Model.PageCount

@Html.PagedListPager(Model, page => Url.Action("Index", new { page, sortOrder = ViewBag.CurrentSort, currentFilter = ViewBag.CurrentFilter }))

Answer 1

首先检查数据库中的关系。如果存在关系，则在删除所有内容后更新.edmx文件。我认为它会起作用。

补充提示： - 1.清洁解决方案 2.重建解决方案

Answer 2

你还没有提到你正在使用什么方法，（DB First或Code First）如果DB首先只更新您的.edmx文件并重建您的Project，否则使用迁移和更新数据库。它应该从数据库中获取该表。

ASP MVC数据库没有显示外键属性

2 个答案: