下拉列表用于未保存选择

Question

我是MVC的新手。 我正在使用 DropDownListFor 来显示公司名称列表，并根据所做的选择填写其他客户字段。客户字段填充良好，但是当我尝试发布记录时，我收到验证错误"公司名称是必需的"，即使已在 DropDownList For 中选择公司名称也是如此。 下面是视图模型：

     namespace CMSUsersAndRoles.Models
{
    public class QuoteViewModel
    {   [Key]
        [Display(Name = "Quote Id")]
        public int QuoteId { get; set; }
        // Columns from Customer table
        [Required(ErrorMessage = "Please select a company")]
        [Display(Name = "Customer Id")]
        public int? CustomerId { get; set; }
        [Display(Name = "Sales Rep")]
        public string SalesRep { get; set; }
        [Display(Name = "First Name")]
        public string FirstName { get; set; }
        [Display(Name = "Last Name")]
        public string LastName { get; set; }
        [Required]
        public string Company { get; set; }
        [Display(Name = "Address 1")]
        public string Address1 { get; set; }
        [Display(Name = "Address 2")]
        public string Address2 { get; set; }
        public string City { get; set; }
        public string State { get; set; }
        [StringLength(10)]
        [Display(Name = "Zip Code")]
        [RegularExpression(@"^d{5}(-d{4})?$", ErrorMessage = "Invalid Zip Code")]
        public string PostalCode { get; set; }
        [Phone]
        [Display(Name = "Work Phone")]
        public string WorkPhone { get; set; }
        [Phone]
        [Display(Name = "Cell Phone")]
        public string CellPhone { get; set; }
        [EmailAddress]
        public string Email { get; set; }
        [Range(0, 100)]
        public decimal? Discount { get; set; }
        [Display(Name = "Payment Terms")]
        public int? PaymentTerms { get; set; }
        // Columns from QuoteDetail table
        [Display(Name = "Quote Detail")]
        public List<QuoteDetail> QuoteDetail { get; set; }
        // Columns from Quote table

        public decimal Subtotal { get; set; }
        public decimal Tax { get; set; }
        public decimal Total { get; set; }
        [DataType(DataType.Date)]
        [Display(Name = "Quote Date")]
        public DateTime? QuoteDate { get; set; }
        [DataType(DataType.Date)]
        [Display(Name = "Good Until")]
        public DateTime? GoodUntil { get; set; }
        [DataType(DataType.Date)]
        [Display(Name = "Quote Sent")]
        public DateTime? QuoteSent { get; set; }
        [DataType(DataType.Date)]
        [Display(Name = "Date Approved")]
        public DateTime? DateApproved { get; set; }
        [DataType(DataType.Date)]
        [Display(Name = "Date Ordered")]
        public DateTime? DateOrdered { get; set; }
    }
}

下面是视图中的代码：

    @Html.DropDownListFor(model => model.CustomerId, new SelectList(ViewBag.Customers, "CustomerId", "Company"), "---Select one---", new { htmlAttributes = new { @class = "company" } });
    @Html.HiddenFor(model => model.Company)
    @Html.ValidationMessageFor(model => model.Company, "", new { @class = "text-danger" })

这是获取：

public ActionResult Create()
        {
            QuoteViewModel qvm = new QuoteViewModel();
            var customers = db.Customers.ToList();
            ViewBag.Customers = customers;
            return View(qvm);
        }

这是开机自检的代码：

[HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create(QuoteViewModel qvm)
{
if (ModelState.IsValid)
            { 
                Quote quote1 = new Quote();
                quote1.CustomerId = qvm.CustomerId;
                ...
                customer.CustomerId = (int)qvm.CustomerId;
                ...
                customer.Company = qvm.Company;    
                db.Entry(customer).State = EntityState.Modified;
                try
                    {
                        db.SaveChanges();
                    }
                    catch (DbUpdateConcurrencyException ex)
                    {
                        var objContext = ((IObjectContextAdapter)db).ObjectContext;
                        // Get failed entry
                        var entry = ex.Entries.Single();
                        // Now call refresh on ObjectContext
                        objContext.Refresh(RefreshMode.ClientWins, entry.Entity);

                    }

                return RedirectToAction("Index");
            }
            var customers = db.Customers.ToList();
            ViewBag.Customers = customers;
            return View(qvm);
        }

我错过了什么？ 任何帮助将不胜感激。

Answer 1

我没有在下面设置隐藏对象的值。 谢谢，@StephenMuecke。

@Html.HiddenFor(model => model.Company)