C# EF:多列外键
我有4个实体需要存储有关多仓库订单的详细信息 订单-订单的标题 仓库-仓库的详细信息C# EF:多列外键,c#,entity-framework,foreign-keys,foreign-key-relationship,C#,Entity Framework,Foreign Keys,Foreign Key Relationship,我有4个实体需要存储有关多仓库订单的详细信息 订单-订单的标题 仓库-仓库的详细信息 public class Order { public int Id { get; set; } public virtual ICollection<OrderWarehouse> OrderWarehouses { get; set; } public virtual ICollection<OrderLine> OrderLines { get; set
public class Order
{
public int Id { get; set; }
public virtual ICollection<OrderWarehouse> OrderWarehouses { get; set; }
public virtual ICollection<OrderLine> OrderLines { get; set; }
}
public class Warehouse
{
public int Id { get; set; }
public virtual ICollection<OrderWarehouse> OrderWarehouses { get; set; }
public virtual ICollection<OrderLine> OrderLines { get; set; }
}
public class OrderLine
{
public int Id { get; set; }
public int OrderId { get; set; }
public int ProductId { get; set; }
public int WarehouseId { get; set; }
[ForeignKey("OrderId")]
public virtual Order Order { get; set; }
[ForeignKey("WarehouseId")]
public virtual Warehouse Warehouse { get; set; }
public virtual OrderWarehouse OrderWarehouse { get; set; } // THIS IS WHERE I AM STRUGGLING
}
public class OrderWarehouse
{
[Key, Column(Order = 0)]
public int OrderId { get; set; }
[Key, Column(Order = 1)]
public int WarehouseId { get; set; }
[ForeignKey("OrderId")]
public virtual Order Order { get; set; }
[ForeignKey("WarehouseId")]
public virtual Warehouse Warehouse { get; set; }
public virtual ICollection<OrderLine> OrderLines { get; set; } // THIS IS WHERE I AM STRUGGLING
}
OrderLines-订单中产品的详细信息(包括其所属的仓库)
OrderWarehouse-有关订单的详细信息,仅与单个仓库相关
public class Order
{
public int Id { get; set; }
public virtual ICollection<OrderWarehouse> OrderWarehouses { get; set; }
public virtual ICollection<OrderLine> OrderLines { get; set; }
}
public class Warehouse
{
public int Id { get; set; }
public virtual ICollection<OrderWarehouse> OrderWarehouses { get; set; }
public virtual ICollection<OrderLine> OrderLines { get; set; }
}
public class OrderLine
{
public int Id { get; set; }
public int OrderId { get; set; }
public int ProductId { get; set; }
public int WarehouseId { get; set; }
[ForeignKey("OrderId")]
public virtual Order Order { get; set; }
[ForeignKey("WarehouseId")]
public virtual Warehouse Warehouse { get; set; }
public virtual OrderWarehouse OrderWarehouse { get; set; } // THIS IS WHERE I AM STRUGGLING
}
public class OrderWarehouse
{
[Key, Column(Order = 0)]
public int OrderId { get; set; }
[Key, Column(Order = 1)]
public int WarehouseId { get; set; }
[ForeignKey("OrderId")]
public virtual Order Order { get; set; }
[ForeignKey("WarehouseId")]
public virtual Warehouse Warehouse { get; set; }
public virtual ICollection<OrderLine> OrderLines { get; set; } // THIS IS WHERE I AM STRUGGLING
}
公共类秩序
{
公共int Id{get;set;}
公共虚拟ICollection命令仓库{get;set;}
公共虚拟ICollection命令行{get;set;}
}
公共类仓库
{
公共int Id{get;set;}
公共虚拟ICollection命令仓库{get;set;}
公共虚拟ICollection命令行{get;set;}
}
公共类命令行
{
公共int Id{get;set;}
公共int-OrderId{get;set;}
public int ProductId{get;set;}
public int WarehouseId{get;set;}
[外键(“订单ID”)]
公共虚拟订单{get;set;}
[外键(“仓库ID”)]
公共虚拟仓库{get;set;}
公共虚拟OrderWarehouse OrderWarehouse{get;set;}//这就是我正在努力的地方
}
公共类订单仓库
{
[键,列(顺序=0)]
公共int-OrderId{get;set;}
[键,列(顺序=1)]
public int WarehouseId{get;set;}
[外键(“订单ID”)]
公共虚拟订单{get;set;}
[外键(“仓库ID”)]
公共虚拟仓库{get;set;}
公共虚拟ICollection命令行{get;set;}//这就是我正在努力的地方
}
我似乎无法正确定义订单行和OrderWarehouse之间的关系
密钥由OrderId、WarehouseId组成
我知道这需要在上下文中定义,但我的所有尝试都会出错
有人能帮我吗
编辑:
如果我尝试这样做:
modelBuilder.Entity<OrderLine>()
.HasOptional(u => u.OrderWarehouse)
.WithMany()
.HasForeignKey(u => new { u.OrderId, u.WarehouseId });
modelBuilder.Entity()
.has可选(u=>u.OrderWarehouse)
.有很多
.HasForeignKey(u=>new{u.OrderId,u.WarehouseId});
我得到:
OrderLine\u OrderWarehouse::多重性与
中角色“OrderLine\u OrderWarehouse\u Target”中的引用约束
关系“OrderLine\u OrderWarehouse”。因为所有的属性
在从属角色中,主体的多重性是不可为空的
角色必须为“1”
您拥有的fluent映射几乎是正确的,但是您不能在不可为null的属性上指定可选关系,如果您尝试以下操作,它应该可以工作
modelBuilder.Entity<OrderLine>()
.HasRequired(u => u.OrderWarehouse)
.WithMany()
.HasForeignKey(u => new { u.OrderId, u.WarehouseId });
modelBuilder.Entity()
.HasRequired(u=>u.OrderWarehouse)
.有很多
.HasForeignKey(u=>new{u.OrderId,u.WarehouseId});