多種模型的MVC客戶端驗證

Question

我有三個模型： VehicleType ， VehicleModel和VehicleManufacturer 。

VehicleType和VehicleManufacturer指向模型中的VehicleModel ，如下所示：

public class VehicleModel
{
    [Key]
    public int ModelId { get; set; }

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

    [Required(ErrorMessage = "Field is Required")]
    public int ManufacturerId { get; set; }
    public string ModelName { get; set; }


    public VehicleType VehicleType { get; set; }
    public VehicleManufacturer Manufacturer { get; set; }

}

從那里，VehicleModel指向InventoryModel：

 public class Inventory
{
    [Key]
    public int InventoryId { get; set; }
    public int Price { get; set; }
    public int Mileage { get; set; }
    public int Year { get; set; }


    public int ModelId { get; set; }
    public VehicleModel VehicleModel { get; set; }
}

我的問題是，當我嘗試在所有三個下拉列表（ VehicleType ， VehicleManufacturer ， VehicleModel ）上進行客戶端驗證時，它僅與VehicleModel一起VehicleModel 。

使用這些模型需要做些什么來驗證這兩個下拉列表？

這是我的控制器（fyi）：

 // GET: /Inventory/Create
    public ActionResult Create()
    {
        ViewBag.TypeId = new SelectList(db.Types, "TypeId", "TypeName"); //(Object List, Value Field (usually Id), Column)
        ViewBag.ModelId = new SelectList(db.Models, "ModelId", "ModelName"); //(Object List, Value Field (usually Id), Column)
        ViewBag.ManufacturerId = new SelectList(db.Manufacturers, "ManufacturerId", "ManufacturerName"); //(Object List, Value Field (usually Id), Column)

        return View();
    }

    // POST: /Inventory/Create
    // To protect from overposting attacks, please enable the specific properties you want to bind to, for 
    // more details see http://go.microsoft.com/fwlink/?LinkId=317598.
    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult Create(Inventory inventory, VehicleManufacturer VehicleManufacturer, VehicleType VehicleType)
    {
        if (ModelState.IsValid)
        {
            db.Inventorys.Add(inventory);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        ViewBag.TypeId = new SelectList(db.Types, "TypeId", "TypeName");
        ViewBag.ModelId = new SelectList(db.Models, "ModelId", "ModelName");
        ViewBag.ManufacturerId = new SelectList(db.Manufacturers, "ManufacturerId",     "ManufacturerName");

        return View(inventory);
    }

視圖：

 <div class="editor-label">
        @Html.LabelFor(model => model.VehicleModel.TypeId, "Some name for column")
    </div>
    <div class="editor-field">
        @Html.DropDownList("TypeId", String.Empty)

        @Html.ValidationMessageFor(model => model.VehicleModel.TypeId)
    </div>


    <div class="editor-label">
        @Html.LabelFor(model => model.ModelId, "Some name for column")
    </div>
    <div class="editor-field">
        @Html.DropDownList("ModelId", String.Empty)
        @Html.ValidationMessageFor(model => model.ModelId)
    </div>



    <div class="editor-label">
        @Html.LabelFor(model => model.VehicleModel.ManufacturerId, "Some name for column")
    </div>
    <div class="editor-field">
        @Html.DropDownList("ManufacturerId", String.Empty)
        @Html.ValidationMessageFor(model => model.VehicleModel.ManufacturerId)
    </div>

請有人幫忙。 我已經花了很多小時了！

Answer 1

我上面確實看到了兩個問題

1）您沒有將DropDownList和ValidationMessageFor映射到同一模型屬性。

@Html.ValidationMessageFor(model => model.VehicleModel.ManufacturerId)

上面將其綁定到VehicleModel_ManufacturerId ，其中：

@Html.DropDownList("ManufacturerId", String.Empty)

上面的將DropDown映射到了ManufacturerId

您需要更改一個或另一個以相互匹配。

2）在上面的代碼中，我沒有看到任何驗證屬性。 您在此處復制代碼時忘記了他們嗎？

希望對您有所幫助，如果您需要更多詳細信息，請告訴我。