C# 一个或多个实体的验证失败-SaveChanges EF4

我正在尝试编写一个生成多张发票的方法。这是针对一所大学的，在那里，客户与导师一起注册一个名为“注册”的课程。通过这种方法，我试图将导师客户的月费乘以他们的佣金百分比进行累加，因为导师会从他们提供的课程中获得一定的佣金。以下是我的代码：

public ActionResult CreateBulkCommissions()
{
    var month = DateTime.Now.ToString("MMMM");

    var enrolments = db.Enrollments.ToList();

    var newCommissions = from enrolment in enrolments
                         select new TutorCommission()
                         {
                             CommissionAmount = enrolment.MonthlyFee,
                             CommissionMonth = month,  // string constant 
                             CommissionStatus = "Unpaid",
                             Tutor = new Tutor { TutorNoID = enrolment.Tutor.TutorNoID, TutorCommissionPercentage = enrolment.Tutor.TutorCommissionPercentage }
                         };
    foreach (var newCommission in newCommissions)
    {
        List<TutorCommission> TutorComs = newCommissions.GroupBy(g => g.Tutor).Select(s => new TutorCommission
        {
            CommissionAmount = s.Sum(u => u.CommissionAmount) * s.Key.TutorCommissionPercentage,
            TutorNoID = s.Key.TutorNoID

        }).ToList();

        db.TutorCommission.Add(newCommission);
        db.SaveChanges();
    }

    return RedirectToAction("Index");
}

public ActionResult（））
{
var month=DateTime.Now.ToString（“MMMM”）；
var enrolments=db.enrolments.ToList（）；
var=从入学人数算起
选择新的TutorCommission（）
{
佣金金额=注册人数。月费，
CommissionMonth=month，//字符串常量
佣金状态=“未付”，
导师=新导师{TutorNoID=incluation.Tutor.TutorNoID，TutorCommissionPercentage=incluation.Tutor.TutorCommissionPercentage}
};
foreach（新来任务中的新来任务）
{
列出tutorcom=newCommissions.GroupBy（g=>g.Tutor）。选择（s=>newtutorcommission
{
佣金金额=s.Sum（u=>u.CommissionMount）*s.Key.TutorCommissionPercentage，
TutorNoID=s.Key.TutorNoID
}).ToList（）；
db.TutorCommission.Add（新任务）；
db.SaveChanges（）；
}
返回操作（“索引”）；
}

在SaveChanges上，我收到一个或多个实体的验证失败的错误消息。在调试期间查看newCommissions的值时，我注意到在TutorCommission中，CommissionID和TutorNoID为0，这可能是问题所在？我如何解决这个问题？下面是一个截图：

这些是相关的类别：

public class Enrollment
{
    [Key]
    [Display(Name = "Enrollment ID Number")]
    public long EnrollmentIDNumber { get; set; }
    [Display(Name = "Client ID Number")]
    public long ClientNumberID { get; set; }
    [Display(Name = "Tutor ID Number")]
    public long TutorNoID { get; set; }
    [Display(Name = "Course Name")]
    public string CourseName { get; set; }
    [Display(Name = "Lesson Time")]
    public string LessonTime { get; set; }
    [Display(Name = "Lesson Day")]
    public string LessonDay { get; set; }
    [Display(Name = "Lesson Location")]
    public string LessonLocation { get; set; }
    [Display(Name = "Lesson Type")]
    public string LessonType { get; set; }
    [Display(Name = "Lesson Level")]
    public string LessonLevel { get; set; }
    [Display(Name = "Monthly Fee")]
    public long MonthlyFee { get; set; }

    public virtual Client Client { get; set; }
    public virtual Tutor Tutor { get; set; }

}

public class TutorCommission
{
    [Key]
    [Display(Name = "Commission ID")]
    public long CommissionID { get; set; }
    [Display(Name = "Commission Month")]
    public string CommissionMonth {get; set;}
    [Display(Name = "Commission Amount")]
    public double CommissionAmount { get; set; }
    [Display(Name = "Commission Status")]
    public string CommissionStatus { get; set; }
    [Display(Name = "Tutor ID Number")]
    public long TutorNoID { get; set; }

    public virtual Tutor Tutor { get; set; }
    public virtual ICollection<CommissionPayments> CommissionPayments { get; set; }

}

public class Tutor
{
    [Key]
    [Display(Name = "Tutor ID Number")]
    public long TutorNoID { get; set; }
    [Required]
    [StringLength(50, ErrorMessage="First name must be less than 50 characters")]
    [Display(Name = "First Name")]
    public string TutorFirstName { get; set; }
    [StringLength(50, ErrorMessage = "Last name must be less than 50 characters")]
    [Display(Name = "Last Name")]
    public string TutorLastName { get; set; }
    [DisplayFormat(DataFormatString = "{0:d}", ApplyFormatInEditMode = true)]
    [Display(Name = "Birth Date")]
    public DateTime? TutorBirthDate { get; set; }
    [Display(Name = "Cellphone Number")]
    public string TutorCellphoneNumber { get; set; }
    [Display(Name = "Home Number")]
    public string TutorHomeNumber { get; set; }
    [RegularExpression("^[a-z0-9_\\+-]+(\\.[a-z0-9_\\+-]+)*@[a-z0-9-]+(\\.[a-z0-9-]+)*\\.([a-z]{2,4})$", ErrorMessage = "Not a valid email address")]
    [Display(Name = "Email Address")]
    public string TutorEmailAddress { get; set; }
    [Display(Name = "Street Address")]
    public string TutorStreetAddress { get; set; }
    [Display(Name = "Suburb")]
    public string TutorSuburb { get; set; }
    [Display(Name = "City")]
    public string TutorCity { get; set; }
    [Display(Name = "Postal Code")]
    public string TutorPostalCode { get; set; }
    [Display(Name="Full Name")]
    public string FullName
    {
        get
        {
            return TutorFirstName + " " + TutorLastName;
        }
    }
    [Display(Name="Commission Percentage")]
    [Required]
    public double TutorCommissionPercentage { get; set; }

    public virtual ICollection<Enrollment> Enrollments { get; set; }
    public virtual ICollection<TutorCommission> TutorCommissions { get; set; }

}

公共班级注册
{
[关键]
[显示（Name=“注册ID号”）]
公共长注册IDNumber{get；set；}
[显示（Name=“客户ID号”）]
public long clientnumberrid{get；set；}
[显示（Name=“导师ID号”）]
公共长TutorNoID{get；set；}
[显示（Name=“课程名称”）]
公共字符串CourseName{get；set；}
[显示（Name=“课程时间”）]
公共字符串LessonTime{get；set；}
[显示（Name=“课程日”）]
公共字符串LessonDay{get；set；}
[显示（Name=“课程位置”）]
公共字符串LessonLocation{get；set；}
[显示（Name=“课程类型”）]
公共字符串LessonType{get；set；}
[显示（名称=“课程级别”）]
公共字符串LessonLevel{get；set；}
[显示（Name=“月费”）]
公共长月份fee{get；set；}
公共虚拟客户端{get；set；}
公共虚拟导师{get；set；}
}
公共班级辅导委员会
{
[关键]
[显示（Name=“佣金ID”）]
公共长委托ID{get；set；}
[显示（Name=“佣金月”）]
公共字符串CommissionMonth{get；set；}
[显示（Name=“佣金金额”）]
公共双佣金挂载{get；set；}
[显示（Name=“佣金状态”）]
公共字符串CommissionStatus{get；set；}
[显示（Name=“导师ID号”）]
公共长TutorNoID{get；set；}
公共虚拟导师{get；set；}
公共虚拟ICollection佣金支付{get；set；}
}
公开课导师
{
[关键]
[显示（Name=“导师ID号”）]
公共长TutorNoID{get；set；}
[必需]
[StringLength（50，ErrorMessage=“名字必须少于50个字符”）]
[显示（Name=“First Name”）]
公共字符串TutorFirstName{get；set；}
[StringLength（50，ErrorMessage=“姓氏必须少于50个字符”）]
[显示（Name=“Last Name”）]
公共字符串TutorLastName{get；set；}
[DisplayFormat（DataFormatString=“{0:d}”，ApplyFormatInEditMode=true）]
[显示（Name=“出生日期”）]
公共日期时间？TutorBirthDate{get；set；}
[显示（Name=“手机号码”）]
公共字符串TutorCellphoneNumber{get；set；}
[显示（Name=“家庭号码”）]
公共字符串TutorHomeNumber{get；set；}
[RegularExpression（“^[a-z0-9\\+-]+（\\.[a-z0-9\\+-]+）*@[a-z0-9-]+（\\.[a-z0-9-]+）*\.（[a-z]{2,4}$”，ErrorMessage=“不是有效的电子邮件地址”）]
[显示（Name=“电子邮件地址”）]
公共字符串TutorEmailAddress{get；set；}
[显示（Name=“街道地址”）]
公共字符串TutorStreetAddress{get；set；}
[显示（Name=“郊区”）]
公共字符串TutorSuburb{get；set；}
[显示（Name=“City”）]
公共字符串TutorCity{get；set；}
[显示（名称=“邮政编码”）]
公共字符串TutorPostalCode{get；set；}
[显示（Name=“全名”）]
公共字符串全名
{
得到
{
返回TutorFirstName+“”+TutorLastName；
}
}
[显示（Name=“佣金百分比”）]
[必需]
公共双TutorCommissionPercentage{get；set；}
公共虚拟ICollection注册{get；set；}
公共虚拟ICollection TutorCommissions{get；set；}
}

实体验证中的错误：

计数=1
{System.Data.Entity.Validation.DbEntityValidationResult}

谢谢， 艾米

尝试改变：

...
from enrolment in enrolments
                     select new TutorCommission()
                     {
                         CommissionAmount = enrolment.MonthlyFee,
                         CommissionMonth = month,  // string constant 
                         CommissionStatus = "Unpaid",
                         Tutor = new Tutor { TutorNoID = enrolment.Tutor.TutorNoID, TutorCommissionPercentage = enrolment.Tutor.TutorCommissionPercentage }
                     };

致：

---

因为当您尝试将新任务添加到db时，EF会尝试插入新的导师，而不是进行关联。

您是先使用EDMX还是先使用代码？@CodingGorilla EDMX实体不是这样干净的。这绝对是CodeFirst@HasanKhan我就是这么想的；但我只是想确定一下。@Amy你能在“EntityValidationErrors”中发布验证异常中的内容吗？@Amy看起来你的密钥没有被填充；您希望这些是在服务器上创建的标识密钥吗？谢谢，验证错误现在消失了。但问题是，这造成了新的佣金下滑

from enrolment in enrolments
                     select new TutorCommission()
                     {
                         CommissionAmount = enrolment.MonthlyFee,
                         CommissionMonth = month,  // string constant 
                         CommissionStatus = "Unpaid",
                         Tutor = enrolment.Tutor
                     };