Question

有没有人会听我说，并帮助我解决我的问题？

我有3个班级（产品，批次和物料）：

每个产品都有很多批次，每个批次都有很多物料。

public class Product {
    public int id { get; set; }
    public string name { get; set; } 
}

public class Lot {
    public int id { get; set; }
    public decimal price { get; set; } 
}

public class Rem {
    public int id { get; set; }
    public string note  { get; set; } 
}

Answer 1

根据您上面的描述，这是EF中相关实体的一种简单方法。

public class Product {
    public int id { get; set; }
    public string name { get; set; } 

    public Lot LotId {get; set; }
    public ICollection<Lot> Lots { get; set; } 
}

public class Lot {
    public int id { get; set; }
    public decimal price { get; set; }

    public Product ProductId {get; set; }
    public Product Product {get; set; }

    public Rem RemId {get; set; }
    public ICollection<Rem> Rems { get; set; }
}

public class Rem {
    public int id { get; set; }
    public string note  { get; set; } 

    public Lot LotId {get; set; }
    public Lot Lot { get; set; } 

}

和dbcontext类

public class AppDbContext: DbContext
{
 public AppDbContext(DbContextOptions<AppDbContext> options): base(options)
{
}

public DbSet<Product> Products { get; set; }
public DbSet<Lot> Lots { get; set; }
public DbSet<Rem> Rems { get; set; }
}

您可以从relationships in EF

中找到有关EF中关系的进一步说明。

实体框架代码优先，模型之间的关系

1 个答案: