我的域模型中有两个实体:
public class Configuration : DomainEntity
{
public virtual ICollection<Hardware> Hardwares { get; set; }
public Configuration()
{
Hardwares = new List<Hardware>();
}
}
public class Hardware : DomainEntity
{
public virtual ICollection<Configuration> Configurations { get; set; }
public Hardware()
{
Configurations = new HashSet<Configuration>();
}
}
我在数据库中有三个表。我绑定这些表:
modelBuilder.Entity<Configuration>().
HasMany<Hardware>(configuration => configuration.Hardwares).
WithMany(hardware => hardware.Configurations).
Map(map => map.ToTable("tblConfiguration_Hardware"));
它工作正常,但是......当我添加相同的硬件时,例如三个硬件,我在 database 中获得了一条记录。
Hardware hardware = db.Find<Hardware>(hardwareID);
configuration.Hardwares.Add(hardware); // first
configuration.Hardwares.Add(hardware); // second
configuration.Hardwares.Add(hardware); // third
db.Add<Configuration>(configuration);
db.SaveChanges();
但我想拯救三个关系。我错了什么?