MVC(信息登记)

(Model)
 public class ShippingAddress
    {
        [Required(ErrorMessage="请输入姓名")]
        [Display(Name="收货人姓名")]
        public string Name { get; set; }

        [Required(ErrorMessage = "请输入省份")]
        [Display(Name = "省份")]
        public string Province { get; set; }

        [Required(ErrorMessage = "请输入城市")]
        [Display(Name = "城市")]
        public string City { get; set; }

        [Required(ErrorMessage = "请输入行政区")]
        [Display(Name = "行政区")]
        public string District { get; set; }

        [Required(ErrorMessage = "请输入详细地址")]
        [Display(Name = "详细地址")]
        public string DetailAddress { get; set; }

        [Required(ErrorMessage = "请输入邮政编码")]
        [Display(Name = "邮政编码")]
        public string Zip { get; set; }

        [Required(ErrorMessage = "请输入电话号码")]
        [Display(Name = "电话号码")]
        public string Phone { get; set; }
    }

加上

(View)
@using (Html.BeginForm())
{
    @Html.ValidationSummary()
    foreach (var property in ViewData.ModelMetadata.Properties)
    {
            <div class="form-group">
                <label>@(property.DisplayName ?? property.PropertyName)</label>
                @Html.TextBox(property.PropertyName, null, new { @class = "form-control" })
            </div>
    }
}

等效于

(html)
<form action="/Cart/Checkout" method="post">
            <div class="form-group">
                <label>收货人姓名</label>
                <input class="form-control" data-val="true" data-val-required="请输入姓名" id="Name" name="Name" type="text" value="">
            </div>
            <div class="form-group">
                <label>省份</label>
                <input class="form-control" data-val="true" data-val-required="请输入省份" id="Province" name="Province" type="text" value="">
            </div>
            <div class="form-group">
                <label>城市</label>
                <input class="form-control" data-val="true" data-val-required="请输入城市" id="City" name="City" type="text" value="">
            </div>
            <div class="form-group">
                <label>行政区</label>
                <input class="form-control" data-val="true" data-val-required="请输入行政区" id="District" name="District" type="text" value="">
            </div>
            <div class="form-group">
                <label>详细地址</label>
                <input class="form-control" data-val="true" data-val-required="请输入详细地址" id="DetailAddress" name="DetailAddress" type="text" value="">
            </div>
            <div class="form-group">
                <label>邮政编码</label>
                <input class="form-control" data-val="true" data-val-required="请输入邮政编码" id="Zip" name="Zip" type="text" value="">
            </div>
            <div class="form-group">
                <label>电话号码</label>
                <input class="form-control" data-val="true" data-val-required="请输入电话号码" id="Phone" name="Phone" type="text" value="">
            </div>
</form>

• 控制器情况

 public ViewResult Checkout()
        {
            return View(new ShippingAddress());
        }

        [HttpPost]
        public ViewResult Checkout(Cart cart, ShippingAddress shippingDetails)
        {
            if (cart.lines.Count() == 0)
            {
                ModelState.AddModelError("", "呃，你的购物车空空如也");
            }

            if (ModelState.IsValid)
            {
                orderProcessor.ProcessOrder(cart, shippingDetails);
                cart.Clear();
                return View("Completed");
            }
            else
            {
                return View(shippingDetails);
            }
        }

    }

我们发现，在这个业务处理中，数据流动顺序是View-->Model-->Controller(Checkout)而非严格的数据流动模式(Controller-->Model-->View)。这暴露了MVC的一个致命缺陷，View与Model可以进行双向的数据传递。这看似灵活，实则混乱。