Question

我有一个简单的购物车模式,其中载有下列物品清单:

public class ShoppingCart
{
    public List<Item> Items { get; set; }
    public double Tax { get; set; }
    // ... some other properties
}

public class Item
{
    public string Name { get; set; }
    public int Quantity { get; set; }
    public double Price { get; set; }
    public double TotalCost { get { return Quantity * Price; } }
}

我想修改某一项目的数量,我提出以下看法:

<%using (Html.BeginForm("Recalculate", "ShoppingCart", Model))
  { %>
<table id="cartTable" border ="5px" cellpadding="5px" cellspacing="5px" width="640">
    <tr>
        <td><b>Item Name</b></td>
        <td><b>Item Qty</b></td>
        <td><b>Item Price</b></td>
        <td><b>Subtotal</b></td>
    </tr>
    <%
    if (Model != null && Model.Items != null)
    {
        foreach (ShoppingCart.Models.Item item in Model.Items)
        {
            %>
            <tr>
                <td><%: item.Name%></td>
                <td><%: Html.TextBoxFor(m => m.Items[Model.Items.IndexOf(item)], new { @Value = item.Quantity })%></td>
                <td><%: String.Format("{0:C}", item.Price)%></td>
                <td><%: String.Format("{0:C}", item.TotalCost)%></td>
            </tr>
            <%
        }
    } 
    %>
    <!-- some other rows/columns go here -->
</table> 
<input type="submit" value="Update Cart" />
<%} %>

我的控制者:

public class ShoppingCartController : Controller
{

    /// </summary>
    /// <returns></returns>
    [HttpGet]
    public ActionResult Show(ShoppingCart model)
    {
        if (model!= null && model.Items == null)
        {
            List<Item> items = new List<Item>();
            items.Add(new Item { Name = "Hat", Price = 20.0, Quantity = 1 });
            items.Add(new Item { Name = "Snowboard", Price = 430.0, Quantity = 1 });
            items.Add(new Item { Name = "Goggles", Price = 24.0, Quantity = 3 });

            model.Items = items;
            model.Tax = 6.5;
        }
        return View(model);
    }

    [HttpPost]
    public ActionResult Recalculate(ShoppingCart model)
    {
        if (model != null && model.Items!=null)
        {
            foreach (Item item in model.Items)
            {
                if (item.Quantity == 0)
                {
                    model.Items.Remove(item);
                }
                else if (item.Quantity < 0)
                {
                    ModelState.AddModelError("error", "The quantity for " + item.Name + " must not be smaller than 0.");
                }
            }
        }
        return RedirectToAction("Show", "ShoppingCart", model);
    }

}

不幸的是,当我点击《最新消息》Cartutton时,它叫我重新计算功能,但现在项目清单上的所有项目都是无效的。我怎么能够保留这些项目并更新某个项目的数量?

在BeginForm职能中,我尝试采用目前的模式,而不是通过模式......没有任何变化。谁能帮助我看上去?

Answer 1

适当地点和事物的这些变化是否开始运转。请注意,虽然价格和总价格的回落不会在模型中填满,因为相应的物品是固定案文。主计长可以重新接纳这些人员,或增加隐蔽领域,以便将这些人员张贴和重新接纳。

<%using (Html.BeginForm("Recalculate", "ShoppingCart", FormMethod.Post))

<td><%: Html.TextBoxFor(m => m.Items[Model.Items.IndexOf(item)].Quantity)%></td>

//return RedirectToAction("Show", "ShoppingCart", model);
return View("Show", model);

Answer 2

 <%= Html.TextBox("Quantity", Model.Items[Model.Items.IndexOf(item)].Quantity ) %>

这是一个 n格员额,值得一读:。

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