MVC多表一种模型

我对来自aspx世界的MVC的理解感到困难。

我有一个名为的模型CustomerGarment。这有一件衣服Order和一件Customer衣服。

public class CustomerGarment
{
    public int CustomerGarmentId { get; set; }

    public virtual Customer Customer { get; set; }

    public virtual Order Order { get; set; }

    public virtual GarmentJacket GarmentJacket { get; set; }
    public virtual GarmentShirt GarmentShirt { get; set; }
}

我有一种获取和发布的方法。页面加载后，它将创建一个新CustomerGarment实例并查询数据库以填充Customer和Order变量。然后，我使用查看包在屏幕上显示GarmentJackets和GarmentShirts的列表

然后，页面视图和使用视图，我可以完美地访问模型。放下Viewbag内容的负载，我可以使用我通过的模型访问所有Customer和Order变量。

然后我遇到的问题是当我使用HttpPost时。该模型不会随我传递给它的信息一起传回。

    public ActionResult AddGarments(int orderId, int customerId)
    {
        CustomerGarment cg = new CustomerGarment();
        cg.Order = (from a in db.Orders where a.OrderId == orderId select a).FirstOrDefault();
        cg.Customer = (from a in db.Customers where a.CustomerId == customerId select a).FirstOrDefault();

        var jackets = from a in db.GarmentJackets orderby a.Type, a.SleeveLengthInches, a.ChestSizeInches select a;
        var shirts= from a in db.GarmentKilts orderby a.PrimarySize, a.DropLength select a;
        ViewBag.GarmentJacket = new SelectList(jackets, "GarmentJacketId", "GarmentJacketId");
        ViewBag.GarmentShirt = new SelectList(shirts, "GarmentShirtId", "GarmentShirtId");

        return View(cg);
    }

    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult AddGarments(CustomerGarment cg)
    {
        // Here, I do not have the customer info for example
        db.CustomerGarments.Add(cg);
        db.SaveChanges();
        return RedirectToAction("Index");

        return View(cg);
    }

这是我的看法

@Html.HiddenFor(model => model.Order.OrderId)
    @Html.HiddenFor(model => model.Order.CustomerId)

    <div class="display-field">
        @Html.DisplayFor(model => model.Customer.Name)
    </div>


    <div class="editor-label">
        @Html.LabelFor(model => model.GarmentJacket, "Jacket")
    </div>
    <div class="editor-field">
        @Html.DropDownListFor(m => m.GarmentJacket, (SelectList)ViewBag.GarmentJacket, new {style="width:312px;height:30px;margin-top:2px;margin-bottom:5px"})
    </div>

编辑

我的服装外套型号

public class GarmentJacket : Garment
{
    public int GarmentJacketId { get; set; }

    [Required]
    public string Type { get; set; }

    [Required]
    [Display(Name = "Chest Size")]
    public int ChestSizeInches { get; set; }

    [Required]
    [Display(Name = "Sleeve Length")]
    public int SleeveLengthInches { get; set; }
 }

public class Garment
{
    [DataType(DataType.Date)]
    public DateTime? DateRetired { get; set; }

    [Required]
    public string Barcode { get; set; }

    [Required]
    public bool Adults { get; set; }
}