提问人:This lowly newb 提问时间:11/30/2019 最后编辑:marc_sThis lowly newb 更新时间:11/30/2019 访问量:65
实体框架将一对多映射到一对一
Entity Framework map one to many to one
问:
我在使用实体框架映射表时遇到了麻烦,其关系是一对多的。
为了清楚起见,下面是表类的图示
public class Human
{
[Key]
public long ID { get; set; }
[Required(ErrorMessage = "must not be empty!", AllowEmptyStrings = false)]
public string HumanName { get; set; }
public virtual ICollection<HumanFootwear> HumanFootwears { get; set; }
}
人类鞋类(用于分组)
public class HumanFootwear
{
[Key]
public long ID { get; set; }
[ForeignKey("HumanID"), DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public virtual Human CHumans { get; set; }
public long HumanID { get; set; }
[ForeignKey("FootwearID"), DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public virtual Footwear Footwears { get; set; }
public long FootwearID { get; set; }
}
鞋类餐桌类
public class Footwear
{
[Key]
public long ID { get; set; }
[Required(ErrorMessage = "must not be empty!", AllowEmptyStrings = false)]
public string BrandName { get; set; }
}
我正在尝试使用流畅的 API 方法,但我无法让它工作
modelBuilder.Entity<Human>()
.HasKey(key => key.ID)
.HasMany(hm => hm.Footwear)
.WithMany(wm => wm.Human)
.Map(map =>
{
map.MapLeftKey("")
});
我在“with many human”上遇到语法错误,
无法将单个类转换为
Human
ICollection<Human>
我做错了吗?我应该绘制人类鞋类的地图吗?
答: 暂无答案
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