EF Core子表多个外键关连同一主表设置方法

using System; using System.Collections.Generic; using System.Linq; using System.Threading.Tasks; using System.ComponentModel.DataAnnotations;  namespace Test.Models {     public class B01_SO     {        [Key]         public int ID { get; set; }          [Display(Name ="销售单号")]         [StringLength(50)]         [Required]         public string SONum { get; set; }          [Display(Name = "单据编号")]         [StringLength(50)]                 public string TKNum { get; set; }           [Display(Name = "交期")]         [Required]         public DateTime Dtime { get; set; }          [Display(Name = "产品描述")]         [StringLength(200)]         [Required]         public string Description { get; set; }           [Display(Name = "销售员")]         public int? SaleID { get; set; }         [Display(Name = "销售员")]         public User Sales { get; set; }           [Display(Name = "制单人")]                 public int? UserID { get; set; }         [Display(Name = "制单人")]         public User User { get; set; }      } }

using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.ComponentModel.DataAnnotations; using System.ComponentModel.DataAnnotations.Schema;  namespace Test.Models {     public class User     {         [Key]         public int ID { get; set; }          [Display(Name = "用户名")]         [StringLength(50)]         [Required]         public string Name { get; set; }          [Display(Name = "邮箱")]         [StringLength(100)]         [Required]         public string Email { get; set; }          [Display(Name = "密码")]         [StringLength(50)]         [Required]         public string Password { get; set; }          [Display(Name = "是否启用")]         [Required]         public bool Enabled { get; set; }          [Display(Name = "性别")]         [StringLength(10)]         [Required]         public string Gender { get; set; }          [Display(Name = "中文名")]         [StringLength(100)]         public string ChineseName { get; set; }          [Display(Name = "英文名")]         [StringLength(100)]         public string EnglishName { get; set; }          [Display(Name = "照片")]         [StringLength(200)]         public string Photo { get; set; }          [Display(Name = "QQ")]         [StringLength(50)]         public string QQ { get; set; }          [Display(Name = "公司邮箱")]         [StringLength(100)]         public string CompanyEmail { get; set; }          [Display(Name = "工作电话")]         [StringLength(50)]         public string OfficePhone { get; set; }          [Display(Name = "分机号")]         [StringLength(50)]         public string OfficePhoneExt { get; set; }          [Display(Name = "家庭电话")]         [StringLength(50)]         public string HomePhone { get; set; }          [Display(Name = "手机号")]         [StringLength(50)]         public string CellPhone { get; set; }          [Display(Name = "地址")]         [StringLength(500)]         public string Address { get; set; }          [Display(Name = "备注")]         [StringLength(500)]         public string Remark { get; set; }          [Display(Name = "身份证")]         [StringLength(50)]         public string IdentityCard { get; set; }           [Display(Name = "生日")]         public DateTime? Birthday { get; set; }         [Display(Name = "任职时间")]         public DateTime? TakeOfficeTime { get; set; }         [Display(Name = "上次登录时间")]         public DateTime? LastLoginTime { get; set; }         [Display(Name = "创建时间")]         public DateTime? CreateTime { get; set; }                  public ICollection<B01_SO> SalseB01_SOs { get; set; }         public ICollection<B01_SO> UserB01_SOs { get; set; }      }       }

using System; using System.Collections.Generic; using System.Linq; using System.Web; using Microsoft.EntityFrameworkCore; using Microsoft.Extensions.Logging;  namespace TestCore.Models {     public class TestCoreContext : DbContext     {         #region 启用控制台日志 EF Core         public static readonly ILoggerFactory MyLoggerFactory = LoggerFactory.Create(builder => { builder.AddConsole(); });         protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)             => optionsBuilder                 .UseLoggerFactory(MyLoggerFactory);         #endregion          public TestCoreContext(DbContextOptions<TestCoreContext> options) : base(options)         {         }                  public DbSet<User> Users { get; set; }                 public DbSet<B01_SO> B01_SO { get; set; }          protected override void OnModelCreating(ModelBuilder modelBuilder)         {             base.OnModelCreating(modelBuilder);              modelBuilder.Entity<B01_SO>()                 .HasOne(u => u.User)                 .WithMany(u => u.UserB01_SOs)                 .HasForeignKey(s => s.UserID)                 .OnDelete(DeleteBehavior.Restrict)                 .IsRequired();             modelBuilder.Entity<B01_SO>()                 .HasOne(u => u.Sales)                 .WithMany(u => u.SalseB01_SOs)                 .HasForeignKey(s => s.SaleID)                 .OnDelete(DeleteBehavior.Restrict)                 .IsRequired();                      }             } }