Question

当我尝试使用MVC3在Edit视图中保存记录时，我会遇到奇怪的行为。创建一个记录很好，没有什么不寻常的。如果我在“编辑”视图中打开相同的记录并对文本框进行更改，则单击“保存”并且记录不会更新。它可以通过断点看到ModelState未设置为有效。在那个断点中，我查看了模型中的键/值对，我看到两个看起来不应该存在的键。这是我的模特：

public class Cases
{
    //case data model for call center
    //implement lists for all related child tables too

    [Key]
    public int CasesID { get; set; }

    public string CaseNumber { get; set; }

    [Required(ErrorMessage = "Customer is Required")]
    public int CustomerID { get; set; }
    public Customer Customer { get; set; }

    [MaxLength(50)]
    public string UserName { get; set; }  //get user name from the aspnet membership

    [Required(ErrorMessage = "Case Category is Required")]
    public int CaseCategoryID { get; set; }

    [Required(ErrorMessage = "Technician is Required")]
    public int TechnicianID { get; set; }
    public Technician Technicians { get; set; }

    [Required(ErrorMessage = "Engine Model is Required")]
    public int EngineModelID { get; set; }
    public EngineModel EngineModel { get; set; }

    [MaxLength(50)]
    public string BMSWorkorder { get; set; }

    [MaxLength(50)]
    [Required(ErrorMessage = "Status is Required")]
    public string CaseStatus { get; set; }

    [MaxLength(50)]
    public string OpenedBy { get; set; }

    [Required(ErrorMessage = "Opened Date is Required")]
    [DataType(DataType.DateTime)]
    public DateTime? OpenedDate { get; set; }

    [MaxLength(50)]
    public string ClosedBy { get; set; }

    [DataType(DataType.DateTime)]
    public DateTime? ClosedDate { get; set; }

    [MaxLength(50)]
    [Required(ErrorMessage="Caller First Name is Required")]
    public string CallerFirstName { get; set; }

    [MaxLength(50)]
    [Required(ErrorMessage = "Caller Last Name is Required")]
    public string CallerLastName { get; set; }

    [MaxLength(10)]
    [Required(ErrorMessage = "Qualified is Required")]
    public string Qualified { get; set; }

    public string Description { get; set; }

    [MaxLength(50)]
    [Required(ErrorMessage = "ESN is Required")]
    public string ESN { get; set; }

    [MaxLength(50)]
    [Required(ErrorMessage = "Mileage is Required")]
    public string Mileage { get; set; }

    [DataType(DataType.Date)]
    public DateTime? DateInService { get; set; }

    [MaxLength(50)]
    public string ESTR { get; set; }

    [MaxLength(50)]
    [Required(ErrorMessage = "EDS is Required")]
    public string EDS { get; set; }

    [MaxLength(50)]
    public string GensetSerialNumber { get; set; }

    [MaxLength(50)]
    public string GensetModelNumber { get; set; }

    //child Case Notes records
    public virtual ICollection<CaseNotes> CaseNotes { get; set; }

    //child case attachment records
    public virtual ICollection<Attachment> Attachments { get; set; }

    //child case complaint records
    public virtual ICollection<CaseComplaint> CaseComplaint { get; set; }

    //tracking fields
    public DateTime? CreatedOn { get; set; }
    [MaxLength(50)]
    public string CreatedBy { get; set; }
    public DateTime? ModifiedOn { get; set; }
    [MaxLength(50)]
    public string ModifiedBy { get; set; }
}

问题似乎出现在Technicians导航属性中。 Technicians nav属性中的字段在我的模型状态中显示为键值对。如果它们中的任何一个都是空的，就像它们可能在任何时候一样，它们会显示为空键值对并导致模型状态无效。

这是技师模型：

public class Technician
{
    public int TechnicianID { get; set; }

    [MaxLength(50)]
    [Required(ErrorMessage = "First Name is Required")]
    public string FirstName { get; set; }

    [MaxLength(50)]
    [Required(ErrorMessage = "Last Name is Required")]
    public string LastName { get; set; }

    [MaxLength(50)]
    public string PromoID { get; set; }

    public int CustomerID { get; set; } //i dont think we need a nav property at this point 06-17-2012

    public string AdditionalContact { get; set; }
}

我不明白这里发生了什么。为什么这些属性会阻止我的模型状态有效？

这是我的编辑控制器操作，用于打开编辑视图：

public ActionResult Edit(int id)
{
    Cases cases = db.Cases.Find(id);
    db.Entry(cases).Reference(x => x.Customer).Load();
    db.Entry(cases).Collection(x => x.CaseComplaint).Load();
    db.Entry(cases).Collection(x => x.CaseNotes).Load();
    db.Entry(cases).Reference(x => x.Technicians).Load();

    GetCaseCategoryLookup(cases.CaseCategoryID);
    GetEngineModelLookup(cases.EngineModelID);
    GetTechnicianLookup(cases.TechnicianID);
    GetQualifiedList(cases.Qualified);
    GetCaseStatusList(cases.CaseStatus);

    return View(cases);
}

这是我的编辑控制器操作，让模型更新数据库。这是模型状态无效的地方。

[HttpPost]
public ActionResult Edit(Cases cases)
{
    if (ModelState.IsValid)
    {
        AppHelpers help = new AppHelpers();

        if (cases.CaseStatus == "CLOSED")
        {
            cases.ClosedBy = "USER";
            cases.ClosedDate = help.GetEasternTime();
        }

        cases.ModifiedBy = "USER";
        cases.ModifiedOn = help.GetEasternTime();

        db.Cases.Add(cases);
        db.Entry(cases).State = EntityState.Modified;
        db.SaveChanges();
    }

    GetCaseCategoryLookup(cases.CaseCategoryID);
    GetEngineModelLookup(cases.EngineModelID);
    GetTechnicianLookup(cases.TechnicianID);
    GetQualifiedList(cases.Qualified);
    GetCaseStatusList(cases.CaseStatus);

    return RedirectToAction("Index");
}

赖安

一个奇怪的实体框架困境

0 个答案: