刪除行ASP.NET MVC ADO.NET實體模型

Question

我有點新手用asp.net MVC環境

我試圖從3表/實體刪除ROW（因爲我是用ado.net實體數據模型自動生成數據庫）時只執行我的刪除功能從1個表中刪除的行問題是..

PS：我也已經建立3個表

這裏的關係是我的控制器：

[HttpPost, ActionName("Delete")] 
    [ValidateAntiForgeryToken] 
    public ActionResult DeleteConfirmed(int id) 
    { 
     // i've edited this code, i think the problem lies in this code bellow 
     // start edited code 
     ms_student ms_student = db.ms_student 
      .Include(i => i.ms_person) 
      .Include(i => i.ms_person.ms_user) 
      .Where(i => i.user_id_student == id) 
      .Single(); 
     // end edited code 

     db.ms_student.Remove(ms_student); 
     db.SaveChanges(); 
     return RedirectToAction("Index"); 
    } 

這是我ms_user型號：

namespace test.Models 
{ 
    using System; 
    using System.Collections.Generic; 

    public partial class ms_user 
    { 
     public int ID { get; set; } 
     public string password { get; set; } 
     public string salt { get; set; } 
     public Nullable<int> administrative_type_id { get; set; } 
     public string email_login { get; set; } 

     public virtual ms_person ms_person { get; set; } 
    } 
} 

這是ms_person模式：

namespace test.Models 
{ 
    using System; 
    using System.Collections.Generic; 

    public partial class ms_person 
    { 
     public int ID { get; set; } 
     public Nullable<int> family_id { get; set; } 
     public string first_name { get; set; } 
     public string last_name { get; set; } 
     public string email { get; set; } 
     public string address { get; set; } 
     public string phone_address { get; set; } 
     public string mobile_phone_number { get; set; } 
     public string gender { get; set; } 
     public Nullable<System.DateTime> date_of_bith { get; set; } 
     public Nullable<System.DateTime> date_start { get; set; } 
     public Nullable<System.DateTime> date_end { get; set; } 
     public string status { get; set; } 
     public string identification_ID { get; set; } 
     public string passport { get; set; } 
     public Nullable<int> user_type_id { get; set; } 
     public string file_image { get; set; } 

     public virtual ms_student ms_student { get; set; } 
     public virtual ms_user ms_user { get; set; } 

    } 
} 

最後我ms_person型號：

namespace test.Models 
{ 
    using System; 
    using System.Collections.Generic; 

    public partial class ms_student 
    { 
     public int user_id_student { get; set; } 
     public int student_code { get; set; } 
     public int course_id { get; set; } 
     public string degree { get; set; } 
     public Nullable<int> current_semester { get; set; } 
     public string cuti_session { get; set; } 

     public virtual ms_person ms_person { get; set; } 
    } 
} 

只是你知道，在生成模型的代碼自動，我使用的ado.net實體模型和唯一的表/實體刪除只是ms_student表（對不起，我有點混淆與命名：模型或實體或表）

上ms_person的ID是自動增量PK 上ms_user其實FK也ID的ms_person 的PK和（愚蠢我爲不同的命名）user_id_student其實FK也ms_person

感謝的PK你很

Answer 1

我想我只是發現了一些解決方案， 我改變我刪除控制器與此：

[HttpPost, ActionName("Delete")] 
    [ValidateAntiForgeryToken] 
    public ActionResult DeleteConfirmed(int id) 
    { 
     // i change this piece of code, not really sure what it means though 
     // very appreciate if somebody can describe it in more humanly or sql language 
     ms_person ms_person = db.ms_person 
      .Include(i => i.ms_student) 
      .Include(i => i.ms_user) 
      .Where(i => i.ID == id) 
      .Single(); 

     db.ms_person.Remove(ms_person); 
     db.SaveChanges(); 
     return RedirectToAction("Index"); 
    } 

這一切從3表中的記錄被刪除，但我不知道這是最好的解決辦法，因爲你可以看到，我只是修改了include（）語句，我真的不知道這個方法可以在其他控制器以及使用...

非常感謝你，如果下跌免費有人可以爲我的問題提供更好的解決方案..：D

Answer 2

你也想去掉ms_person和ms_user？

執行此操作。

db.ms_student.Remove(ms_student); 
if (ms_student.ms_person != null) 
{ 
    db.ms_person.Remove(ms_student.ms_person); 
    if (ms_student.ms_person.ms_user != null) 
    { 
     db.ms_user.Remove(ms_student.ms_person.ms_user); 
    } 
} 
db.SaveChanges(); 

Answer 3

[HttpGet] 
public ActionResult DeleteFacilitator(Int64 FacID) 
{ 
    if(FacID == null) 
    { 
     return new HttpStatusCodeResult(HttpStatusCode.BadRequest); 
    } 
    var Resul= db.NFE_Facilitator.Find(ID); 
    if(Resul==null) 
    { 
     return HttpNotFound(); 
    } 
     return View(Resul); 
} 
[HttpPost,ActionName("DeleteFacilitator")] 
public ActionResult DeleteConfirmed(Int64 ID) 
{ 
    var Resul= db.NFE_Facilitator.Find(ID); 
    db.NFE_Facilitator.Remove(Resul); 
    db.SaveChanges(); 
    return RedirectToAction("SearchFacilitator"); 
}