我正在使用EF 4.1 RC Code First。在Junction表Friends中,我有一个使用复合PK的多对多关系。我们需要明确一个单独的Friends类(不要问为什么),该类表示我们的Junction表。我们的目标是能够从User实体控制删除过程。在阅读其余内容之前,请阅读此内容:http://mocella.blogspot.com/2010/01/entity-framework-v4-object-graph.html。因此,我们设法创建了复合PK,但这破坏了我们集合的映射。问题是如何映射FriendsCol?
public class User
{
public int UserId { get; set; }
public string Name { get; set; }
public virtual ICollecion<Friends> FriendsCol { get; set; }
}
public class Friends
{
public int User1Id { get; set; }
public int User2Id { get; set; }
public User User1 { get; set; }
public User User2 { get; set; }
}
拥有一个复合键映射
public class FriendsMap : EntityTypeConfiguration<Friends>
{
HasKey(m => new { m.userId1 , m.userId2 });
//this.HasRequired(x => x.User1)
//.WithMany()
//.HasForeignKey(x => x.User1Id)
//.WillCascadeOnDelete(false);
//this.HasRequired(x => x.User2)
// .WithMany()
// .HasForeignKey(x => x.User2Id)
// .WillCascadeOnDelete(false);
}
public class UserMap : EntityTypeConfiguration<UserNew>
{
public UserMap()
{
ToTable("users");
Property(user => user.Name).HasColumnName("name");
// HasMany<Friends>(user => user.FriendsCol).WithMany();
}
}