根据DropDownList选择显示表单字段

Question

当用户选择资产类型时，我希望我的“创建”表单根据所选的资产类型显示不同的字段。

例如：如果用户选择资产类型“笔记本电脑”，我希望表单显示笔记本电脑资产的所有相关字段。但是，如果用户选择资产类型“打印机”，我希望表单显示打印机资产的相关字段。

这是我的资产模型：

public class Asset
{
    [Key]
    public int AssetID { get; set; }
    public int AssetMakeID { get; set; }
    public int AssetTypeID { get; set; }
    public string User { get; set; }
    public int DepartmentID { get; set; }
    public string AssetModel { get; set; }
    public string AssetSerialNo { get; set; }
    public string PurchaseOrderNo { get; set; }
    public string Supplier { get; set; }
    public string WarrantyInfo { get; set; }
    public DateTime DatePurchased { get; set; }
    public string ComputerName { get; set; }
    public int CPUID { get; set; }
    public string RAM { get; set; }
    public string HardDrive { get; set; }
    public int OperatingSystemID { get; set; }
    public string OperatingSystemProductKey { get; set; }

显然，并非所有这些属性都适用于打印机资产。

这是我的资产管理器中的Create方法：

 // GET: Asset/Create
        public ActionResult Create()
        {
            ViewBag.AssetMakeID = new SelectList(db.AssetMake, "AssetMakeID", "Name");
            ViewBag.AssetTypeID = new SelectList(db.AssetType, "AssetTypeID", "Type");
            ViewBag.CPUID = new SelectList(db.CPU, "CPUID", "Name");
            ViewBag.DepartmentID = new SelectList(db.Department, "DepartmentID", "DepartmentName");
            ViewBag.OperatingSystemID = new SelectList(db.OperatingSyst, "OperatingSystemID", "Name");
            return View();
        }

        // POST: Asset/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([Bind(Include = "AssetID,AssetMakeID,AssetTypeID,User,DepartmentID,AssetModel,AssetSerialNo,PurchaseOrderNo,Supplier,WarrantyInfo,DatePurchased,ComputerName,CPUID,RAM,HardDrive,OperatingSystemID,OperatingSystemProductKey")] Asset asset)
        {
            if (ModelState.IsValid)
            {
                db.Asset.Add(asset);
                db.SaveChanges();
                return RedirectToAction("Index");
            }

            ViewBag.AssetMakeID = new SelectList(db.AssetMake, "AssetMakeID", "Name", asset.AssetMakeID);
            ViewBag.AssetTypeID = new SelectList(db.AssetType, "AssetTypeID", "Type", asset.AssetTypeID);
            ViewBag.CPUID = new SelectList(db.CPU, "CPUID", "Name", asset.CPUID);
            ViewBag.DepartmentID = new SelectList(db.Department, "DepartmentID", "DepartmentName", asset.DepartmentID);
            ViewBag.OperatingSystemID = new SelectList(db.OperatingSyst, "OperatingSystemID", "Name", asset.OperatingSystemID);
            return View(asset);
        }

我如何根据用户选择的AssetTypeID在我的创建视图中显示字段？