.NET Entity Framework 核心一对多关系

Question

当我尝试使用 EF 创建 table 时，我看到 User table 中 FK 的名称与我的预期不同，并且 'allow null'。我打算在 'User' table 下创建 FK 'orgId'。我参考了website这个。对于示例，它为 'Student' table 下面的 'Grade' 创建了一个外键。你能告诉我我在这里错过了什么吗？（*我使用了 EntityFrameworkCore@3.1.0）

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace Domain
{
    public class User
    {
        [Key]
        public int userId { get; set; }
        [Required]
        public string userEmail { get; set; }
        public string previousPW { get; set; }
        public string userHashedPassword { get; set; }
        public DateTime userResetPWDate { get; set; }
        public string userResetCode { get; set; }
        public string userFullName { get; set; }
        public string userOrgName { get; set; }
        public string userJobTitle { get; set; }
        public string userFName { get; set; }
        public string userLName { get; set; }
        public string userPhone { get; set; }
        public string userFax { get; set; }
        public string userLevel { get; set; }
        public DateTime userCreatedDate { get; set; }
        public DateTime userAccessedDate { get; set; }
        public string userComment { get; set; }

        public int orgId { get; set; }
        public virtual Organization Organization { get; set; }

        public virtual ICollection<PermissionPkgView> PermissionPkgView { get; set; }
    }
}

using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;

namespace Domain
{
    public class Organization
    {
        [Key]
        public int orgId { get; set; }
        public string orgName { get; set; }
        public virtual ICollection<User> User { get; set; }
    }
}

作为一些评论，我尽量照着做，和参考一样。

namespace Domain
{
    public class Student
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public Grade Grade { get; set; }
    }
}
----
using System.Collections.Generic;

namespace Domain
{
    public class Grade
    {
        public int GradeID { get; set; }
        public string GradeName { get; set; }
        public string Section { get; set; }

        public ICollection<Student> Student { get; set; }
    }
}

然而，结果与样本不同。它创建了 'FK_Student_Grade_GradeID' 并允许 null。

Answer 1

最后我直接用'Fluent API'，就正常显示FK了。

using Microsoft.EntityFrameworkCore;
using Domain;

namespace Persistence
{
    public class DataContext : DbContext
    {
        public DataContext(DbContextOptions options) : base(options)
        {
        }

        public DbSet<tbl_PW> tbl_PW { get; set; }
        public DbSet<User> User { get; set; }
        public DbSet<Organization> Organization { get; set; }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            base.OnModelCreating(builder);

            builder.Entity<User>()
            .HasOne<Organization>(u => u.Organization)
            .WithMany(o => o.User)
            .HasForeignKey(u => u.orgId);
        }
    }
}

.NET Entity Framework 核心一对多关系

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