地图弱实体先用code [英] Map weak entity by using Code first

问题描述

您好我已经开发了模型，完美的作品对我来说，现在我想用的EntityFramework它映射到数据库中，这里是其中的一部分：

Hi I have developed model that works perfectly for me, now I want to map it to database using EntityFramework, here is a part of it:

public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public virtual ProductType Type { get; set; }
}

public class Supplier
{
    public int Id { get; set; }
    public string OIB { get; set; }
    public string Name { get; set; }
}

public class SupplierProduct
{
    public double Price { get; set; }
    public string SupplierMark { get; set; }

    public virtual Product Product { get; set; }
    public virtual Supplier Supplier { get; set; }
}

现在我的问题是我怎么写模型构建实体配置形成我的DbContext，以便其映射在SupplierProduct类ForeignKeys Supllier.ID和Product.Id为DB关系的主键。

Now my question is how do I write entity configuration on ModelBuilder form my DBContext so that it maps on SupplierProduct class ForeignKeys Supllier.ID and Product.Id as Primary key of DB relation.

推荐答案

我用数据标注，但我希望你正在寻找以下内容：

I use data annotations, but I expect you're looking for the following:

为产品和公司在 SupplierProduct ，指定这些ID字段FK的，然后定义有两个ID字段复合主键

define ID properties for Product and Supplier in SupplierProduct, specify these ID fields as FK's, then define compound primary key with the two ID fields

modelBuilder.Entity<SupplierProduct>()
    .HasRequired( sp => sp.Product)
    .WithMany( p => SupplierProducts )
    .HasForeignKey( sp => sp.ProductId );

modelBuilder.Entity<SupplierProduct>()
    .HasRequired( sp => sp.Supplier)
    .WithMany( s => SupplierProducts )
    .HasForeignKey( sp => sp.SupplierId );

modelBuilder.Entity<SupplierProduct>()
    .HasKey(sp=> new { sp.ProductId, sp.SupplierId });

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