EF 4.1參照完整性錯誤

Question

我有以下類別：

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我已經定義：

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); 

誰能告訴我什麼，我做錯了什麼？

更新：

當我執行此代碼：

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

我得到以下錯誤：

A referential integrity constraint violation occurred: The property values that define the referential constraints are not consistent between principal and dependent objects in the relationship.

Answer 1

請嘗試這種方式

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

Answer 2

當定義你的模型，你並不需要指定參考ID屬性EF將爲您在數據庫中創建這些屬性。

更改您的UserAnswer模型

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

    public virtual Survey Survey { get; set; } 

    public virtual Question Question { get; set; } 

    public virtual Answer Answer { get; set; } 
} 

Answer 3

我知道已經晚了，但也許這可能是有用的人。試試這個怎麼樣？

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

最近，我有說，「發生參照完整性約束衝突：定義引用約束的屬性值不本金和依賴對象的關係之間是一致的。」當我編輯的實體錯誤兒童。

這是我在開始代碼：

myAction.ActionUserNameAssignations.Clear(); 

string[] sSelectedValues = CheckBoxListHelper.GetAllIds(collection, "CheckBox_UserName_", true).ToArray(); 
foreach (string userName in sSelectedValues) 
{ 
    ActionUserNameAssignation assignation = new ActionUserNameAssignation { ActionId = myAction.ActionId, UserName = userName }; 
    myAction.ActionUserNameAssignations.Add(assignation); 
} 

db.Actions.Attach(myAction); 
db.ObjectStateManager.ChangeObjectState(myAction, EntityState.Modified); 
db.SaveChanges(); 

這是我在最後的代碼，做工精細：

db.Actions.Attach(myAction); 
db.ObjectStateManager.ChangeObjectState(myAction, EntityState.Modified); 

myAction.ActionUserNameAssignations.Clear(); 

string[] sSelectedValues = CheckBoxListHelper.GetAllIds(collection, "CheckBox_UserName_", true).ToArray(); 
foreach (string userName in sSelectedValues) 
{ 
    ActionUserNameAssignation assignation = new ActionUserNameAssignation { ActionId = myAction.ActionId, UserName = userName }; 
    myAction.ActionUserNameAssignations.Add(assignation); 
} 

db.SaveChanges(); 

正如你所看到的，所不同的是基本附加實體在開始的背景下。我希望它有幫助:)