我有一个实体Person和Detail。 Detail引用Person（一对多）。我还有Student实体，它继承自Person实体的StudentDetail和Detail实体。
当我创建Student的实例时，我想添加Details Student StudentDetail实例的Details。因此，我通过覆盖基类中的属性在Student实体中创建了新的Person集合。还通过覆盖基类中的属性在StudentDetail类中创建了Student引用属性。当我创建新的StudentDetail并将public class Person
{
public int Id { get; set; }
public string Name { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
public string Address { get; set; }
public virtual IList<Detail> Details { get; set; } = new List<Detail>();
public virtual Passport Passport { get; set; }
}
public class Student : Person
{
public int Course { get; set; }
public string Phone { get; set; }
public new IList<StudentDetail> Details { get { return base.Details.Cast<StudentDetail>().ToList(); } }
}
public class Passport
{
public int Id { get; set; }
public string Number { get; set; }
public DateTime IssuedDate { get; set; }
public DateTime Expires { get; set; }
public virtual Person Person { get; set; }
public virtual AdditionalInfo AdditionalInfo { get; set; }
}
public class AdditionalInfo
{
public int Id { get; set; }
public string SuedBefore { get; set; }
public string CriminalRecords { get; set; }
public virtual Passport Passport { get; set; }
}
public class Detail
{
public int Id { get; set; }
public string Name { get; set; }
public int Count { get; set; }
public int OwnerId { get; set; }
public virtual Person Owner { get; set; }
}
public class StudentDetail : Detail
{
public string StudentStuff { get; set; }
public new Student Owner { get { return base.Owner as Student; } set { base.Owner = value; } }
}
添加到列表并将其保存到数据库时，所有信息都按预期保存。但是当我尝试从数据库中读回学生时，该集合是空的。这是我的实体。还有一些其他实体，但它们不是必需的：
public class MyEntities : DbContext
{
public MyEntities()
: base("data source=localhost;initial catalog=Test1;integrated security=True;")
{
Database.Log = s => System.Diagnostics.Debug.WriteLine(s);
}
public DbSet<Person> People { get; set; }
public DbSet<Student> Students { get; set; }
public DbSet<Passport> Passports { get; set; }
public DbSet<AdditionalInfo> Additionalinfos { get; set; }
public DbSet<Detail> Details { get; set; }
public DbSet<StudentDetail> StudentDetails { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
Database.SetInitializer(new MyDbContextInitializer());
// Configure Code First to ignore PluralizingTableName convention
// If you keep this convention then the generated tables will have pluralized names.
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
PersonMapping(modelBuilder);
StudentMapping(modelBuilder);
PassportMapping(modelBuilder);
AdditionalInfotMapping(modelBuilder);
DetailMapping(modelBuilder);
StudentDetailMapping(modelBuilder);
}
void PersonMapping(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Person>().ToTable("Person");
modelBuilder.Entity<Person>().HasKey(t => new { t.Id });
modelBuilder.Entity<Person>().Property(t => t.Id).HasColumnName("Id").HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
modelBuilder.Entity<Person>().Property(t => t.Name).HasColumnName("Name");
modelBuilder.Entity<Person>().Property(t => t.LastName).HasColumnName("LastName");
modelBuilder.Entity<Person>().Property(t => t.Email).HasColumnName("Email");
modelBuilder.Entity<Person>().Property(t => t.Address).HasColumnName("Address");
//associations
modelBuilder.Entity<Person>().HasOptional(p => p.Passport).WithOptionalPrincipal(p => p.Person);
}
void StudentMapping(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Student>().ToTable("Student");
modelBuilder.Entity<Student>().Property(t => t.Course).HasColumnName("Course");
modelBuilder.Entity<Student>().Property(t => t.Phone).HasColumnName("Phone");
//modelBuilder.Entity<Student>().Ignore(t => t.Details);
}
void PassportMapping(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Passport>().ToTable("Passport");
modelBuilder.Entity<Passport>().HasKey(t => new { t.Id });
modelBuilder.Entity<Passport>().Property(t => t.Id).HasColumnName("Id").HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
modelBuilder.Entity<Passport>().Property(t => t.Number).HasColumnName("Number");
modelBuilder.Entity<Passport>().Property(t => t.IssuedDate).HasColumnName("IssuedDate");
modelBuilder.Entity<Passport>().Property(t => t.Expires).HasColumnName("Expires");
//associations
modelBuilder.Entity<Passport>().HasOptional(p => p.AdditionalInfo).WithOptionalPrincipal(p => p.Passport);
}
void AdditionalInfotMapping(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<AdditionalInfo>().ToTable("Additionalinfo");
modelBuilder.Entity<AdditionalInfo>().HasKey(t => new { t.Id });
modelBuilder.Entity<AdditionalInfo>().Property(t => t.Id).HasColumnName("Id").HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
modelBuilder.Entity<AdditionalInfo>().Property(t => t.SuedBefore).HasColumnName("SuedBefore");
modelBuilder.Entity<AdditionalInfo>().Property(t => t.CriminalRecords).HasColumnName("CriminalRecords");
//associations
//modelBuilder.Entity<Passport>().HasRequired(p => p.Person);
}
void DetailMapping(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Detail>().HasKey(t => new { t.Id });
modelBuilder.Entity<Detail>().Property(t => t.Id).HasColumnName("Id").HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
modelBuilder.Entity<Detail>().Property(t => t.Name).HasColumnName("Name");
modelBuilder.Entity<Detail>().Property(t => t.Count).HasColumnName("Count");
modelBuilder.Entity<Detail>().Property(t => t.OwnerId).HasColumnName("OwnerId");
modelBuilder.Entity<Detail>().HasRequired(c => c.Owner).WithMany(d => d.Details);
}
void StudentDetailMapping(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<StudentDetail>().ToTable("StudentDetail");
modelBuilder.Entity<StudentDetail>().HasKey(t => new { t.Id });
modelBuilder.Entity<StudentDetail>().Property(t => t.Id).HasColumnName("Id").HasDatabaseGeneratedOption(DatabaseGeneratedOption.None);
modelBuilder.Entity<StudentDetail>().Property(t => t.StudentStuff).HasColumnName("StudentStuff");
//modelBuilder.Entity<StudentDetail>().Ignore(t => t.Owner);
}
}
public class MyDbContextInitializer : DropCreateDatabaseIfModelChanges<MyEntities>
{
protected override void Seed(MyEntities dbContext)
{
base.Seed(dbContext);
}
}
更新：Fluent Mapping：
DataTextField有人知道如何实现这个目标吗？