EF 4.1参照完整性错误

Question

我有以下课程:

public class Person
{
    [Key]
    public Guid Id { get; set; }

    [Required]
    public string FirstName { get; set; }

    [Required]
    public string LastName { get; set; }

    [Required]
    public string Email { get; set; }

    public virtual Survey Survey { get; set; }
}

public class Survey
{
    [Key]
    public Guid Id { get; set; }

    public bool IsFinished { get; set; }

    public virtual ICollection<UserAnswer> UserAnswers { get; set; }

    public virtual Person Person { get; set; }
}

public class UserAnswer
{
    [Key]
    public Guid Id { get; set; }

    public Guid SurveyId { get; set; }
    public virtual Survey Survey { get; set; }

    public Guid QuestionId { get; set; }
    public virtual Question Question { get; set; }

    public Guid AnswerId { get; set; }
    public virtual Answer Answer { get; set; }
 }

在我的datacontext中,我定义了:

 modelBuilder.Entity<Survey>().HasRequired(s => s.Person).WithOptional();
 modelBuilder.Entity<Survey>().HasMany(s => s.UserAnswers).WithRequired(a => a.Survey).HasForeignKey(a => a.SurveyId).WillCascadeOnDelete(false);

有人能告诉我我做错了什么吗？

更新:

当我执行此代码时:

var surveyRepository = new SurveyRepository();
foreach (var userAnswer in userAnswers)
{
    survey.UserAnswers.Add(userAnswer);
}
surveyRepository.InsertOrUpdate(survey);
surveyRepository.Save();

我收到以下错误:

发生了引用完整性约束违规:定义引用约束的属性值在关系中的主体和从属对象之间不一致.

Answer 1

请尝试这种方式

 var surveyRepository = new SurveyRepository();
 foreach (var userAnswer in userAnswers)
 {
+    userAnswer.SurveyId = Survey.Id;
     survey.UserAnswers.Add(userAnswer);
 }
 surveyRepository.InsertOrUpdate(survey);
 surveyRepository.Save();