Asp.net mvc 如何设置链接表

更新帖子 我正在尝试使用modelBuilder为我创建链接表。我能够在没有错误的情况下进行迁移。在sql数据库中创建链接表。但是，当我查询客户的作业时，ChangeOrders仍然返回空值。我需要查询什么？我的项目没有要引用的链接表类，所以我迷路了

原职： 我正在尝试为我的多对多关系设置一个链接表。每个作业都可以有多个客户我创建了一个JobCustomer来执行此操作，但返回的唯一数据是链接表上的类Id

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看看这是否有帮助。那么我会先上职业课吗？然后是链接表？我需要一个单独的链接表，用于JobCustomer、JobType等。实际查询数据的代码在哪里？k，我用新信息更改了我原来的帖子。

public class ApplicationUser : IdentityUser
{
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public bool? Hidden { get; set; }
    public string UserEmail { get; set; }
}

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext()

        : base("DefaultConnection", throwIfV1Schema: false)
    {
        this.Configuration.LazyLoadingEnabled = false;
        this.Configuration.ProxyCreationEnabled = false;

    }
    public DbSet<Job> Jobs { get; set; }

    public DbSet<Employee> Employees { get; set; }
    public DbSet<Customer> Customers { get; set; }
    public DbSet<ChangeOrder> ChangeOrders { get; set; }
    public DbSet<JobType> JobTypes { get; set; }
    public DbSet<GeoArea> GeoAreas { get; set; }
    public DbSet<JobClass> JobClasses { get; set; }

    protected override void OnModelCreating
   (DbModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);
        modelBuilder.Entity<Job>()
        .HasMany(j => j.Customers)
        .WithMany(c => c.Jobs)
        .Map(m =>
      {
        m.ToTable("JobCustomer");
        m.MapLeftKey("JobId");
        m.MapRightKey("CustomerId");
   });
        modelBuilder.Entity<Job>()
        .HasMany(j => j.ChangeOrders)
        .WithMany(c => c.Jobs)
        .Map(m =>
        {
            m.ToTable("JobChangeOrder");
            m.MapLeftKey("JobId");
            m.MapRightKey("ChangeOrderId");
        });
        modelBuilder.Entity<Job>()
       .HasMany(j => j.GeoAreas)
       .WithMany(c => c.Jobs)
       .Map(m =>
       {
           m.ToTable("JobGeoArea");
           m.MapLeftKey("JobId");
           m.MapRightKey("GeoAreaId");
       });
        modelBuilder.Entity<Job>()
       .HasMany(j => j.JobTypes)
       .WithMany(c => c.Jobs)
       .Map(m =>
       {
           m.ToTable("JobJobType");
           m.MapLeftKey("JobId");
           m.MapRightKey("JobTypeId");
       });
        modelBuilder.Entity<Job>()
       .HasMany(j => j.JobClasses)
       .WithMany(c => c.Jobs)
       .Map(m =>
       {
           m.ToTable("JobJobClass");
           m.MapLeftKey("JobId");
           m.MapRightKey("JobClassId");
       });
    }

   }


  public class Job
    {

    public int JobId { get; set; }
    public int JobNumber { get; set; }
    public string JobName { get; set; }
    public string JobDescription { get; set; }


    public ICollection<Customer> Customers { get; set; }
    public ICollection<ChangeOrder> ChangeOrders { get; set; }
    public ICollection<GeoArea> GeoAreas { get; set; }
    public ICollection<JobClass> JobClasses { get; set; }
    public ICollection<JobType> JobTypes { get; set; }
}

 public List<Job> GetJobs()
    {
        List<Job> jobs = new List<Job>();
        jobs = db.Jobs
            .ToList();
        return jobs;
    }