Question

在这里，我有一个Dropdownlistfor我的项目。但在这里我坚持得到选择的值。我尝试下面。但仍然无法从下拉列表中获取所选项目

@Html.DropDownListFor(m => m.ProductType, (SelectList)ViewBag.ListOfCategories, new { @class = "form-control"})

型号代码

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

控制器

 [HttpPost]
    public ActionResult AddProduct(ICS.Models.ProductsModels.Products model)
    {
        ProductController _ctrl = new ProductController();
        _ctrl.AddorUpdateProduct(new ICS.Data.Product
        {
            ProductName = model.ProductName,
            ProductType = model.ProductType,
            IsFixed = model.PriceSettings,
            ItemPrice = model.ItemPrice,
            PurchasePrice = model.PurchasePrice,
            Vat = model.Vat,
            WholeSalePrice = model.WholeSalePrice,
            Comments = model.Comments
        });
        return View(model);
    }


[HttpGet]
    public ActionResult AddProduct()
    {
        ViewBag.ListOfCategories = new SelectList(_cat.GetCategory(), "CategoryId", "CategoryName");
        return View();
    }

Answer 1

我建议Razor只是不明白文本是什么以及下拉列表选项中有什么值，所以它只生成空下拉（没有值属性）。你可以检查你渲染的HTML，我想它看起来像

<select>
   <option>Category1Name</option>
   <option>Category2Name</option>
   <option>Category3Name</option>
   ...
</select>

你应该使用IEnumerable<SelectListItem>作为下拉菜单的来源。例如：

[HttpGet]
public ActionResult AddProduct()
{
    // this has to be the list of all categories you want to chose from
    // I'm not shure that _cat.GetCategory() method gets all categories. If it does You
    // should rename it for more readability to GetCategories() for example
    var listOfCategories = _cat.GetCategory();

    ViewBag.ListOfCategories = listOfCategories.Select(c => new SelectListItem {
        Text = c.CategoryName,
        Value = c.CategoryId
    }).ToList();

    return View();
}

无法获取@ Html.DropDownListFor选定值

1 个答案: