Asp.net MVC,显示来自数据库的数据(多对多)

Asp.net MVC , showing data from db(many to many)

我有 2 个 tables,书籍和属性,它们与 table Attribute_Book 之间存在多对多关系。我没有设法执行创建功能,只是想在详细信息视图中显示来自第 3 个 table 的数据。我手动放置它只是为了检查并遇到问题,除了我想显示的值之外,它还显示一个代理,它是属性名称(用断点看到它)。项目首先是数据库。感谢您的帮助。

这是我的 Books ViewModel

    public BookModel()
    {
        this.Attribute_Book = new HashSet<Attribute_Book>();
    }

    public int BookID { get; set; }

    public string Title { get; set; }

    public int AuthorID { get; set; }

    public int CountryID { get; set; }

    public decimal Price { get; set; }

    public string Description { get; set; }

    public Nullable<int> PagesCount { get; set; }

    public string Picture { get; set; }

    public decimal TotalPrice { get; set; }

    public virtual ICollection<Attribute_Book> Attribute_Book { get; set; }
    public virtual Author Author { get; set; }
    public virtual Country Country { get; set; }

这是我的属性模型

    public Attribute()
    {
        this.Attribute_Book = new HashSet<Attribute_Book>();
    }

    public int AttributeID { get; set; }
    public string Name { get; set; }
    public int AttTypeID { get; set; }

    public virtual ICollection<Attribute_Book> Attribute_Book { get; set; }
    public virtual Attribute_Type Attribute_Type { get; set; }

这是我的 Attribute_Book 模型

    public int ID { get; set; }
    public int BookID { get; set; }
    public int AttributeID { get; set; }
    public string ValueTypeText { get; set; }
    public Nullable<System.DateTime> ValueTypeDate { get; set; }

    public virtual Attribute Attribute { get; set; }
    public virtual Book Book { get; set; }

这是我在控制器中的详细操作

    public async Task<ActionResult> Details(int? id)
    {
        if (id == null)
        {
            return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
        }
        //Book book = await db.Books.Include(b=>b.Attribute_Book).FirstOrDefaultAsync(b=>b.BookID==id);

        Book book = await db.Books.FindAsync(id);

        BookModel model = GetBooks.Details(book);

        if (book == null)
        {
            return HttpNotFound();
        }
        return View(model);
    }

以及我想显示数据的视图部分 Details.cshtml

    <dd>
        @Html.DisplayFor(model => model.Attribute_Book)
        @{
            var extAtt = Model.Attribute_Book.FirstOrDefault();
            if (extAtt != null)
            {
                @extAtt.ValueTypeText
            }
        }
    </dd>

详细信息视图正在使用我的 ViewModel,我认为它可能会有所帮助,但仍然没有帮助,我的功能是获取视图模型的详细信息

public static BookModel Details(Book item)
    {
        var model = new BookModel
        {
            BookID = item.BookID,
            Title = item.Title,
            PagesCount = Convert.ToInt32(item.PagesCount),
            Description = item.Description,
            Price = item.Price,
            CountryID = item.CountryID,
            AuthorID = item.AuthorID,
            Author = item.Author,
            Country = item.Country,
            Picture = item.Picture,
            TotalPrice = item.Country.TelCode + item.Price,
            Attribute_Book = item.Attribute_Book.ToList()
        };
        return model;
    }

这是它向我展示的内容

System.Data.Entity.DynamicProxies.Attribute_E4A8D634F0CCC98D73ED369A80817849BFA813311536941614A7242B3A2751A2 456

最后 3 个数字是我想要得到的值))

所有问题都在眼前。刚刚删除了这部分 @Html.DisplayFor(model => model.Attribute_Book) 并且它有效,我想 displayfor 正在获取主键 id 之后的第一个数据值,它是 AttributeID 并试图显示它。