如何使用EF执行限制删除行为以进行迁移构建

Question

我有一个与具有one-to-many关系Country，State和City的相关表相关的PatientRegistry表。在迁移期间，默认的DeleteBehavior设置为Cascade，这在database Update期间给了我错误。如果我将其更改为Restrict，则可以正确使用seed。我试图在构建过程中执行Restrict的行为，但在播种过程中我一直遇到此错误

未经手的例外：system.invalidoperationException：关联 在实体类型之间，"城市"one_answers"患者报告"已被切断，但 这种关系的外键不能设置为无效。如果是 依赖实体应删除，然后设置要使用的关系 级联删除。

我如何防止在构建过程中删除级联反应？

我正在发布相对代码

[Table("PatientsRegistry")]
    public class PatientRegistry
    {   [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    [Display(Name = "Record Id")]
        public long RecordId { get; set; }
        [Key, DatabaseGenerated(DatabaseGeneratedOption.None)]
        [Display(Name = "Patient File Number")]
        public long PatientFileId { get; set; }
        public int CountryId { get; set; }
        public Country Country { get; set; }
        public int StateId { get; set; }
        public State State { get; set; }
        public int CityId { get; set; }
        public City City { get; set; }
        [Timestamp]
        public byte[] RowVersion { get; set; }
        public ICollection<PartnerRegistry> Partners { get; set; }
        public PatientRegistry()
        {
            Partners = new Collection<PartnerRegistry>();
        }
    }

和我的OnModelCreating

        builder.Entity<ApplicationUser>()
                .HasOne(c => c.Country)
                .WithOne()
                .OnDelete(DeleteBehavior.Restrict);
        builder.Entity<ApplicationUser>()
                .HasOne(c => c.State)
                .WithOne()
                .OnDelete(DeleteBehavior.Restrict);
        builder.Entity<ApplicationUser>()
                .HasOne(c => c.City)
                .WithOne()
                .OnDelete(DeleteBehavior.Restrict);

我播种如下，

  if (!context.PatientsRegistry.Any())
                    {
                        context.PatientsRegistry.AddRange(
                             new PatientRegistry
                             {
                                 PatientFileId = 1111,
                                 CountryId = context.Countries.Where(g => g.Name == "Jordan").SingleOrDefault().Id,
                                 StateId = context.States.Where(g => g.Name == "Amman").SingleOrDefault().Id,
                                 CityId = context.Cities.Where(g => g.Name == "Abu Nusair").SingleOrDefault().Id,
                             }
                        );
                        context.SaveChanges();

                    }

Answer 1

完全错过了它，应该是 WithMany()

        builder.Entity<ApplicationUser>()
                .HasOne(c => c.Country)
                .WithMany()
                .OnDelete(DeleteBehavior.Restrict);
        builder.Entity<ApplicationUser>()
                .HasOne(c => c.State)
                .WithMany()
                .OnDelete(DeleteBehavior.Restrict);
        builder.Entity<ApplicationUser>()
                .HasOne(c => c.City)
                .WithMany()
                .OnDelete(DeleteBehavior.Restrict);