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我正在尝试更改我的产品以使用代码而不是类别。实现标签非常简单，但只要我从产品模型中删除类别，我就开始发现错误。删除EF代码优先列
简单地说，我有以下类别：
public class BaseProduct
{
public int ID {get; set;}
public int CategoryID {get;set;}
public virtual Category Category {get;set;}
public virtual ICollection<ProductTag> Tags {get;set;}
}
[Table("Products")]
public class Product : BaseProduct
{
public string ImageUrl {get;set;}
}
[Table("Packages")]
public class Package : BaseProduct
{
public virtual ICollection<Product> Products {get;set}
}
public class Category
{
public int CategoryID {get;set;}
public string CategoryName {get;set;}
public int ParentID {get;set;}
public virtual Category Parent {get;set;}
public virtual ICollection Products {get;set;}
}
public class ProductTag
{
[Key, Column(Order = 0)]
public int ProductId {get;set;}
[Key, Column(Order = 1)]
public string TagName {get;set;}
public virtual BaseProduct Product {get;set;}
public virtual Tag Tag {get;set;}
}
public class Tag
{
[Key]
public string Name {get;set;}
public virtual Collection<ProductTag> ProductTags {get;set;}
}
我这样做对模型制作：
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Package>().HasMany(p => p.Products).WithMany(p => p.Packages)
.Map(m =>
{
m.ToTable("PackageRelations");
m.MapLeftKey("PackageID");
m.MapRightKey("ProductID");
});
modelBuilder.Entity<Category>()
.HasOptional(c => c.Parent)
.WithMany(c => c.Children)
.HasForeignKey(c => c.ParentID);
modelBuilder.Entity<BaseProduct>()
.HasRequired(p => p.Category)
.WithMany(c => c.Products)
.HasForeignKey(p => p.CategoryID);
modelBuilder.Entity<ProductTag>()
.HasRequired(c => c.Product)
.WithMany(c => c.Tags)
.HasForeignKey(c => c.ProductId);
modelBuilder.Entity<ProductTag>()
.HasRequired(c => c.Tag)
.WithMany(c => c.ProductTags)
.HasForeignKey(c => c.TagName);
}
这是所有工作的罚款，我得到了我的DB下表：
- BaseProducts
- 分类
- PackageRelations
- 包
- 产品
- ProductTags
- 标签
但是，如果我编辑BaseProduct和删除类别ID和虚拟类，像这样：
public class BaseProduct
{
public int ID {get; set;}
public virtual ICollection<ProductTag> Tags {get;set;}
}
并从类别中删除虚拟产品：
public class Category
{
public int CategoryID {get;set;}
public string CategoryName {get;set;}
public int ParentID {get;set;}
public virtual Category Parent {get;set;}
}
而且从OnModelCreating删除映射：
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Package>().HasMany(p => p.Products).WithMany(p => p.Packages)
.Map(m =>
{
m.ToTable("PackageRelations");
m.MapLeftKey("PackageID");
m.MapRightKey("ProductID");
});
modelBuilder.Entity<Category>()
.HasOptional(c => c.Parent)
.WithMany(c => c.Children)
.HasForeignKey(c => c.ParentID);
modelBuilder.Entity<ProductTag>()
.HasRequired(c => c.Product)
.WithMany(c => c.Tags)
.HasForeignKey(c => c.ProductId);
modelBuilder.Entity<ProductTag>()
.HasRequired(c => c.Tag)
.WithMany(c => c.ProductTags)
.HasForeignKey(c => c.TagName);
}
然后，当我去使用该产品型号的页面时，我收到以下错误：
说明：在执行当前Web请求期间发生未处理的异常。请查看堆栈跟踪以获取有关该错误的更多信息以及源代码的位置。
异常详细信息：System.Data.Entity.ModelConfiguration.ModelValidationException：模型生成期间检测到一个或多个验证错误：
BaseProduct：被引用的EntitySet 'BaseProduct' 的结束 'BaseProduct'在包含的EntityContainer中找不到。 BaseProduct：：在包含的EntityContainer中找不到结束'BaseProduct'的引用EntitySet'BaseProduct'