下拉值获得空值

Question

我使用断点调试，我的ClientsId总是空的，并且显示在我的支付索引上总是我的Dropdownlist列表的第一个值

型号：

public class Payments
{
    [Key]
    public int PaymentsId { get; set; }

    public int ClientId { get; set; }
    public virtual Client Client { get; set; }

}

ViewModel：

public class PaymentsViewModel
{
    [Required(ErrorMessage = "Please select a client")]
    [Display(Name = "Client")]
    public int SelectedClient { get; set; }
    public IEnumerable<SelectListItem> Client { get; set; }
}

获取控制器：

  public ActionResult Create(Payments model)
  {
      var liste= new PaymentsViewModel
      {
          Clients = new SelectList(db.ClientList, "ClientId", "ClientName")
      };
      return View(liste);
  }

岗控员：

public ActionResult Create([Bind(Include = "....")] PaymentsViewModel model)
{
    if (ModelState.IsValid)
    {
        model.PaymentsCreate();
        return RedirectToAction("Index", "Payments");
    }

    return View(model);
}

创建视图：

            @Html.DropDownListFor(m => m.SelectedClient, Model.Clients, "-Please select-", new { @class = "form-control" })

        </div>
    </div>

编辑控制器(GET)：

 public ActionResult Edit(int? id, PaymentsViewModel model)
 {
      if (id == null)
      {
          return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
      }
      Payments payments = db.PaymentsList.Find(id);
      if (payments == null)
      {
          return HttpNotFound();
      }
      return View();
  }

编辑控制器(POST)

 [HttpPost]
 [ValidateAntiForgeryToken]
 public ActionResult Edit([Bind(Include = "PaymentsId,Paymentnumber,PaymentDate,Amount,Discount,Reference,Total")] Payments payments)
 {
     if (ModelState.IsValid)
     {
         db.Entry(payments).State = EntityState.Modified;
         db.SaveChanges();
         return RedirectToAction("Index");
     }
     return View(payments);
 }

Answer 1

您应该在ClientsId函数(如: ClientsId = model.SelectedClient )上添加来自model.SelectedClient的PaymentsCreate初始化。然后，您需要在创建(post)方法中将SelectedClient字符串添加到属性枚举以进行绑定(包括.属性