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我在发布后不断返回空属性的视图模型遇到问题。下面是我的代码（它可能是一个语法问题或两个调用与我在其他帖子中看到的同名的类或属性，但我在代码中看不到任何此类问题）：

查看型号：

public class ProductItem
    {
        public int ProductID { get; set; }
        public string Code { get; set; }
        public string Name { get; set; }
        public string Description { get; set; }
        public string LongDescription { get; set; }
        public int SupplierID { get; set; }
        public string Dimensions { get; set; }
        public double Price { get; set; }
        public bool On_Sale { get; set; }
        public double DiscountedPrice { get; set; }
        public string Thumbnail { get; set; }
        public string LargeImage { get; set; }
        public string LargeImage2 { get; set; }
        public string LargeImage3 { get; set; }
        public string CrossRef { get; set; }
        public byte Available { get; set; }
        public double Weight { get; set; }
        public byte Important { get; set; }
        public virtual ICollection<ProductCategory> ProductCategories { get; set; }

        // this is required on the page to allow products to be marked for deletion
        public bool IsForDelete { get; set; }
    }

    public class ProductListViewModel
    {
        public IEnumerable<ProductItem> ProductItems { get; set; }
        public IEnumerable<Category> CategoryItems { get; set; }
    }

控制器：

public ActionResult ProductList()
        {
            var productList = new ProductListViewModel();
            productList.ProductItems = productRepository.GetProductsWithDeleteOption().ToList();
            productList.CategoryItems = categoryRepository.GetCategories().ToList();
            return View(productList);
        }

        [HttpPost]
        public ActionResult ProductList(ProductListViewModel productViewModel, FormCollection formCollection, string submit)
        {            
            if (ModelState.IsValid)
            {
                // Check for submit action
                if (submit == "Change Sort")
                {
                    if (formCollection["Sortby"] == "ProductID")
                    {
                        OrderBy(productViewModel, formCollection, "m.ProductID");
                    }
                    else if (formCollection["Sortby"] == "Code")
                    {
                        OrderBy(productViewModel, formCollection, "m.Code");
                    }
                    else if (formCollection["Sortby"] == "Name")
                    {
                        OrderBy(productViewModel, formCollection, "m.Name");
                    }
                    else if (formCollection["Sortby"] == "Price")
                    {
                        OrderBy(productViewModel, formCollection, "m.Price");
                    }
                }
                else if (submit == "Delete all selected")
                {

                }
                else if (submit == "Update All")
                {

                }
                else if (submit == "Restrict Display")
                {

                }
            }
            return View(productViewModel);
        }

看法：

@model Admin.Models.ViewModels.ProductListViewModel

@{
    ViewBag.Title = "View Products";
}

@using (Html.BeginForm())
{
<h2>Product List as at @DateTime.Now.ToString("dd/MM/yyyy")</h2>
<table>
    <tr>
        <td>Sort by:</td>
        <td>
            <select name="Sortby">
                <option value="ProductID">ProductID</option>
                <option value="Code">Code</option>
                <option value="Name">Name</option>
                <option value="Price">Price</option>
            </select>
        </td>
        <td>
            <input type="radio" name="sortDirection" checked="checked" value="Asc" /> Ascending
            <input type="radio" name="sortDirection" value="Desc" /> Descending
        </td>
        <td>
            <input type="submit" name="submit" value="Change Sort" />
        </td>
    </tr>
    <tr>
        <td>Display only : (category)</td>
        <td>@Html.DropDownList("CategoryID", new SelectList(Model.CategoryItems, "CategoryID", "Name"), "All Categories")</td>
        <td colspan="2"><input type="submit" name="submit" value="Restrict Display" /></td>
    </tr>
    <tr>
        <td colspan="4"><br />Total Number of products: @Model.ProductItems.Count()</td>
    </tr>
</table>
<table>
    <tr>
        <th>
            Edit
        </th>
        <th>
            Code
        </th>
        <th>
            Name
        </th>
        <th>
            Price
        </th>
        <th>
            On_Sale
        </th>
        <th>
            DiscountedPrice
        </th>
        <th>
            Weight
        </th>
        <th>
            Delete
        </th>
        <th></th>
    </tr>

@for (var i = 0; i < Model.ProductItems.ToList().Count; i++)
{
    <tr>
        <td>
            @Html.HiddenFor(m => m.ProductItems.ToList()[i].ProductID)            
            @Html.ActionLink(Model.ProductItems.ToList()[i].ProductID.ToString(), "ProductEdit", new { id = Model.ProductItems.ToList()[i].ProductID })
        </td>
        <td>
            @Html.DisplayFor(m => m.ProductItems.ToList()[i].Code)
        </td>
        <td>
            @Html.DisplayFor(m => m.ProductItems.ToList()[i].Name)
        </td>
        <td>
            @Html.EditorFor(m => m.ProductItems.ToList()[i].Price)
        </td>
        <td>
            @Html.CheckBoxFor(m => m.ProductItems.ToList()[i].On_Sale, new { id = "On_Sale_" + Model.ProductItems.ToList()[i].ProductID })
        </td>
        <td>
            @Html.EditorFor(m => m.ProductItems.ToList()[i].DiscountedPrice)
        </td>
        <td>
            @Html.EditorFor(m => m.ProductItems.ToList()[i].Weight)
        </td>
        <td>
            @Html.CheckBoxFor(m => m.ProductItems.ToList()[i].IsForDelete, new { id = Model.ProductItems.ToList()[i].ProductID }) 
        </td>
        <td>
            @Html.ActionLink("Edit", "ProductEdit", new { id = Model.ProductItems.ToList()[i].ProductID }) |
            @Html.ActionLink("Details", "Details", new { id = Model.ProductItems.ToList()[i].ProductID }) |
            @Html.ActionLink("Delete", "Delete", new { id = Model.ProductItems.ToList()[i].ProductID })
        </td>
    </tr>
}

</table>
<p>
    <input name="submit" type="submit" value="Delete all selected" />
</p>
<p>
    <input name="submit" type="submit" value="Update All" />
</p>

<p>
    @Html.ActionLink("Add a new product", "ProductAdd")
</p>

}

在 post 操作中，productViewModel 参数的 ProductItems 和 CategoryItems 属性为 null。

4

2 回答 2

3

好的，所以有两个问题。

  1. 我不明白你为什么要发布CategoryItems你应该只期望所选类别而不是列表的列表

  2. 问题ProductItems是为<input>标签生成的名称。目前，正在生成的名称name="[0].Price"应该是name="ProductItems[0].Price"

我更改了以下代码

@Html.EditorFor(m => m.ProductItems.ToList()[i].Price)

至

@Html.EditorFor(m => m.ProductItems[i].Price)

它奏效了。

注意：我改成IEnumerable<ProductItem> ProductItemsin List<ProductItem> ProductItemsProductListViewModel

于 2013-07-12T05:58:17.590 回答
1

是的，回发时它将为空。我的一个项目中有一张类似的桌子，考虑到我的情况，这就是我会做的。

您可以将视图模型更改为如下所示，然后您不必在视图中进行太多转换为列表：

public class ProductListViewModel
{
     public List<ProductItem> ProductItems { get; set; }

     public List<Category> CategoryItems { get; set; }
}

现在在你看来它可能看起来像这样（这只是它的一部分，然后休息你可以去添加）：

@for (int i = 0; i < Model.ProductItems.Count(); i++)
{
     <tr>
          <td>
               @Html.DisplayFor(m => m.ProductItems[i].Name)
               @Html.HiddenFor(m => m.ProductItems[i].Name)
          </td>
     </tr>
     <tr>
          <td>
               @Html.CheckBoxFor(m => m.ProductItems[i].IsForDelete)
          </td>
     </tr>
}

添加代码并进行一些调试以查看提交时如何返回值

我希望这有帮助。

于 2013-07-12T06:36:25.720 回答