c# - Entity Framework Fluent API - 映射多对多关系，并从中查询

Question

在广泛阅读本主题后，我想实现自己的多对多关系。这是我的用例：

仅供参考：虽然 和之间没有 FK 关系Program，并且充当关系列ProviderProgram.ProvIDProvider.ProvID

在我的 DAL 中，我有以下模型：

public class Patient
    {
        public Patient()
        {
            Programs = new HashSet<Program>();
        }
        public virtual ICollection<Program> Programs { get; set; }
}

public class Program
    {
        public Program()
        {
            Patients = new HashSet<Patient>();
            Organization = new HashSet<Organization>();
        }

        public int ProgramId { get; set; }
        public string Name { get; set; }
        public string SiteName { get; set; }
        public int ProviderId { get; set; }
        public virtual ICollection<Patient> Patients { get; set; }
        public virtual ICollection<Organization> Organization { get; set; }
    }

public class Organization
{
    public Organization()
    {
        Programs = new HashSet<Program>();
    }

    public int OrgID { get; set; }
    public string Name { get; set; }
    public virtual ICollection<Program> Programs { get; set; }
}

在我的AppContext我将这些模型映射如下：

modelBuilder.Entity<Organization>().ToTable("Organization").HasKey(x => x.OrgID);    
            modelBuilder.Entity<Patient>().ToTable("Patient").HasKey(x => x.PatientID);                
            modelBuilder.Entity<Program>().ToTable("Program").HasKey(p => p.ProgramId);
            modelBuilder.Entity<Program>().ToTable("Program").Property(p => p.ProviderId).HasColumnName("ProvID");                
            modelBuilder.Entity<Program>()
                .HasMany(p => p.Patients)
                .WithMany(p => p.Programs)
                .Map(pp =>
                {
                    pp.MapLeftKey("ProgID");
                    pp.MapRightKey("PatientID");
                    pp.ToTable("PatProg");
                });
            modelBuilder.Entity<Organization>()
                .HasMany(o => o.Programs)
                .WithMany(p => p.Organization)
                .Map(prov =>
                {
                    prov.MapLeftKey("OrgID");
                    prov.MapRightKey("ProvID");
                    prov.ToTable("Provider");
                });

现在，我想选择.PatientOrganization

return Context.Set<Organization>().AsNoTracking().Where(o => o.OrgID == organizationId)
                .SelectMany(o => o.Programs)
                .SelectMany(p => p.Patients)

但是，这会产生 0 回报。此外，当我在执行期间运行分析器时，输出查询与我映射的内容并不接近。

SELECT 
    [Join1].[PatientID1] AS [PatientID], 
    [Join1].[FirstName] AS [FirstName], 
    [Join1].[LastName] AS [LastName], 
    [Join1].[SSN#] AS [SSN#], 
    [Join1].[Suffix] AS [Suffix]
    FROM  
        [dbo].[Provider] AS [Extent1]
        INNER JOIN  (
                        SELECT 
                            [Extent2].[ProgID] AS [ProgID], 
                            [Extent3].[PatientID] AS [PatientID1], 
                            [Extent3].[FirstName] AS [FirstName], 
                            [Extent3].[LastName] AS [LastName], 
                            [Extent3].[SSN#] AS [SSN#], 
                            [Extent3].[Suffix] AS [Suffix]
                        FROM
                            [dbo].[PatProg] AS [Extent2] 
                            INNER JOIN [dbo].[Patient] AS [Extent3] ON [Extent2].[PatientID] = [Extent3].[PatientID] ) AS [Join1] ON [Extent1].[ProvID] = [Join1].[ProgID]
    WHERE [Extent1].[OrgID] = 111

我真的不确定我在这里做错了什么。