删除操作使用DB方面

Question

我有我的删除操作，我得到这个异常的问题：

类型的第一个机会异常“System.Data.Entity.Infrastructure .DbUpdateException'发生在 EntityFramework.dll

其他信息：'Model1Container.PublicationSet' 中的实体参与'PublicationQuartier'关系。 0相关 'Quartier'被发现。预计将有'Quartier'。

这里我删除操作：

 [HttpPost] 
    public ActionResult DeleteOffreLocation(int id, OffreLocation offreLocation) 
    { 
     try 
     { 
      db.Entry(offreLocation).State = System.Data.Entity.EntityState.Deleted; 
      db.SaveChanges(); 

      return RedirectToAction("ListOffreLocation"); 
     } 
     catch 
     { 
      return View(); 
     } 
    } 

“OffreLocation” 型号：

public partial class OffreLocation : Publication 
{ 
    public OffreLocation() 
    { 
     this.Locataire = new HashSet<Locataire>(); 
     this.DemandeLocation = new HashSet<DemandeLocation>(); 
     this.DemandeLocation1 = new HashSet<DemandeLocation>(); 
     this.DemandeLocation2 = new HashSet<DemandeLocation>(); 
     this.DemandeLocation3 = new HashSet<DemandeLocation>(); 
    } 

    public string OffreLocation_TypeLog { get; set; } 
    public string OffreLocation_Sante { get; set; } 
    public double OffreLocation_Loyer { get; set; } 
    public System.DateTime OffreLocation_DateDisponibilite { get; set; } 
    public double OffreLocation_Superficie { get; set; } 
    public short OffreLocation_NbreChambre { get; set; } 
    public short OffreLocation_NbrePieces { get; set; } 

    public virtual ICollection<Locataire> Locataire { get; set; } 
    public virtual Proprietaire Proprietaire { get; set; } 
    public virtual ICollection<DemandeLocation> DemandeLocation { get; set; } 
    public virtual ICollection<DemandeLocation> DemandeLocation1 { get; set; } 
    public virtual ICollection<DemandeLocation> DemandeLocation2 { get; set; } 
    public virtual ICollection<DemandeLocation> DemandeLocation3 { get; set; } 
} 

“出版” 型号：

public partial class Publication 
{ 
    public Publication() 
    { 
     this.Photo = new HashSet<Photo>(); 
    } 

    public int Publication_ID { get; set; } 
    public string Publication_Statut { get; set; } 
    public bool Publication_Meublee { get; set; } 
    public string Publication_Descriptif { get; set; } 
    public bool Publication_ContactParAgence { get; set; } 
    public double Publication_Maps_Latitude { get; set; } 
    public double Publication_Maps_Longitude { get; set; } 

    public virtual Quartier Quartier { get; set; } 
    public virtual ICollection<Photo> Photo { get; set; } 
} 

和finaly这里我DB集装箱：

public partial class Model1Container : DbContext 
{ 
    public Model1Container() 
     : base("name=Model1Container") 
    { 
    } 

    protected override void OnModelCreating(DbModelBuilder modelBuilder) 
    { 
     throw new UnintentionalCodeFirstException(); 
    } 

    public DbSet<Utilisateur> UtilisateurSet { get; set; } 
    public DbSet<Abonnement> AbonnementSet { get; set; } 
    public DbSet<AbonnementHistorique> AbonnementHistoriqueSet { get; set; } 
    public DbSet<ColocataireIdeal> ColocataireIdealSet { get; set; } 
    public DbSet<Publication> PublicationSet { get; set; } 
    public DbSet<Quartier> QuartierSet { get; set; } 
    public DbSet<Ville> VilleSet { get; set; } 
    public DbSet<RegionProvince> RegionProvinceSet { get; set; } 
    public DbSet<Photo> PhotoSet { get; set; } 
    public DbSet<MessageLocation> MessageLocationSet { get; set; } 
    public DbSet<MessageColocation> MessageColocationSet { get; set; } 

    public System.Data.Entity.DbSet<COM.MENNILIK.Models.Locataire> Locataires { get; set; } 

    public System.Data.Entity.DbSet<COM.MENNILIK.Models.OffreLocation> OffreLocations { get; set; } 
} 

Answer 1

其实你需要删除传递给视图的对象。您可以使用id或您的型号OffreLocation。我会给你一个id的例子。

[HttpPost] 
public ActionResult DeleteOffreLocation(int id, OffreLocation offreLocation) 
{ 
    try 
    { 
     var offreLocationGetById =db.OffreLocations.Find(id); 
     if(offreLocationGetById!=null) 
     db.OffreLocations.Remove(offreLocationGetById); 

     db.SaveChanges(); 

     return RedirectToAction("ListOffreLocation"); 
    } 
    catch 
    { 
     return View(); 
    } 
} 

我也建议你使用的不是FluentApi代码你对此有何评论你OnModelCreating和你身边抛出Exception。这是一个建议。

Answer 2

它似乎是一个模型验证错误。我很确定Quartier是必需的，并且在您的Action的offre中，Quartier应该为null。

所以你必须：

• 填入的Quartier，或
• 禁用验证。