[英]EF6 1:optional + 1:many
EF6 Code First(在MVC Web应用程序中)遇到了一些问题。
枚举将“ AccountCircle”中的帐户分类:
public enum AccountType
{
Circle1,
Circle2,
Circle3,
Circle4,
Circle5
}
帐户主类:
[Table("Accounts")]
public class AccountModel
{
public AccountModel()
{
}
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int id { get; set; }
public string Name { get; set; }
public string EMail { get; set; }
}
主要公司型号
[Table("Companys")]
public class CompanyModel
{
public CompanyModel()
{
this.AccountCircle = new AccountCircleModel();
}
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int id { get; set; }
public string Name { get; set; }
public int? idAccountCircle { get; set; }
public AccountCircleModel AccountCircle { get; set; }
}
单圈课:
[Table("AccountCircles")]
public class AccountCircleModel
{
public AccountCircleModel()
{
this.Member = new List<AccountCirleMemberModel>();
}
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int id { get; set; }
public int idCompany { get; set; }
public CompanyModel Company { get; set; }
public List<AccountCirleMemberModel> Member { get; set; }
}
最后但并非最不重要的一点是,具有其他信息的帐户本身是什么类型的成员:
[Table("AccountCircleMember")]
public class AccountCirleMemberModel
{
public AccountCirleMemberModel()
{
}
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
public int id { get; set; }
public AccountType Typ { get; set; }
public int idAccount { get; set; }
public virtual AccountModel Account { get; set; }
public int idAccountCircle { get; set; }
public AccountCircleModel AccountCircle { get; set; }
}
还有DbContext
public class TestContext : DbContext
{
public TestContext()
: base()
{
}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
// modelBuilder Infos.....
base.OnModelCreating(modelBuilder);
}
#region Tables
public DbSet<AccountModel> Accounts { get; set; }
public DbSet<CompanyModel> Companys { get; set; }
public DbSet<AccountCircleModel> AccountCircles { get; set; }
#endregion
}
因此,有一家公司,其属性类型为“ AccountCircle”(1:可选)。在Accountcircle中,有一个带有单独枚举的帐户列表(AccountCirleMemberModel 1:许多)
我尝试了数百种modelBuilder方法来为EF6提供必要的信息,但没有成功。 有没有人暗示要给“受保护的覆盖无效OnModelCreating”方法中的DbModelBuilder提供正确的关系数据?
预先感谢! 蒙特
不知道这是否能回答您的问题,但是如果您想使用EF Code First在数据库中指定表之间的关系,则必须将修饰符virtual
用于“导航”属性-那些映射到另一个表的属性。 因此,代码如下所示:
[Table("Companys")]
public class CompanyModel
{
// other properties and the rest of the code here
public virtual AccountCircleModel AccountCircle { get; set; }
}
[Table("AccountCircles")]
public class AccountCircleModel
{
// other properties and the rest of the code here
public virtual CompanyModel Company { get; set; }
public virtual ICollection<AccountCirleMemberModel> Member { get; set; }
}
[Table("AccountCircleMember")]
public class AccountCirleMemberModel
{
// other properties and the rest of the code here
public virtual AccountModel Account { get; set; }
public virtual AccountCircleModel AccountCircle { get; set; }
}
您不需要添加可用作外键的属性-EF会解决这一问题。 您可以指定它们,但随后必须使用fluent API将这些属性映射为特定表的外键。
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