Question

我在使用DropDownList验证的ASP.NET MVC中遇到问题。我有两个动作“创建”。它们定义如下：

public ActionResult Create()
    {
        var categoriasDownloads = from catDown in modelo.tbCategoriasDownloads
                                  orderby catDown.TituloCategoriaDownload ascending
                                  select catDown;

        ViewData["CategoriasDownloads"] = new SelectList(categoriasDownloads, "IDCategoriaDownloads", "TituloCategoriaDownload");

        var formatosArquivos = from formatosDown in modelo.tbFormatosArquivos
                               orderby formatosDown.NomeFormatoSigla
                               select formatosDown;

        ViewData["FormatosArquivos"] = new SelectList(formatosArquivos, "IDFormatoArquivo", "NomeFormatoSigla");

        return View();
    }

，第二个动作是：

[HttpPost]
    public ActionResult Create(tbDownloads _novoDownload)
    {
        TryUpdateModel(modelo);
        TryUpdateModel(modelo.tbDownloads);

        if (ModelState.IsValid)
        {
            modelo.AddTotbDownloads(_novoDownload);
            modelo.SaveChanges();

            return RedirectToAction("Sucesso", "Mensagens");
        }

        return View(_novoDownload);
    }

问题是：尝试验证时，验证不会发生。我正在使用数据注释来验证，但我还没有成功。

我该怎么办？

由于

Answer 1

验证发生但您正在验证错误的对象。

WRONG：

TryUpdateModel(modelo);
TryUpdateModel(modelo.tbDownloads);

正确：

TryUpdateModel(_novoDownload);

Answer 2

$。validator.addMethod（ “选择无”，

        function (value, element) {
            return this.optional(element) || element.selectedIndex != 0;
        },
       "Please select an option."
    );


    $(function () {
        $("#form1").validate({
            rules: {
                ProductCategoryList: {
                    selectNone: true
                }

            },
            messages: {
                ProductCategoryList: {
                    selectNone: "This field is required"
                }
            }
        });
    });

DropDownList验证 - 问题

2 个答案: