Question

在尝试使用必填字段验证创建下拉控件时，我曾经收到此消息：

具有键'SelectedNCRType'的ViewData项的类型为'System.Int32' 但必须是“IEnumerable”类型。

不知怎的，我设法让一切都在我的本地机器上工作，一切都很好看。然而，当我发布项目并将文件复制到测试服务器时，只要下拉控件上的验证失败，就会再次显示此消息。以下是一些代码段：

View Model:
[DisplayName("NCR Type:")]
public IEnumerable<SelectListItem> NCRTypeSelectList
{
   get;
   set;
}

[Range(1, Int32.MaxValue, ErrorMessage = "Required Field")]
public int SelectedNCRType { get; set; }

Controller:
var types = (from x in context.NCRTypes
             where x.Deleted == false
             select new models.NCRType
             {
                 Deleted = x.Deleted,
                 Id = x.Id,
                 Name = x.Name
             }).ToList();
model.NCRTypeSelectList = types.ToSelectList("Id", "Name");

View:
<%= Html.DropDownListFor(x => x.SelectedNCRType, Model.NCRTypeSelectList, "Select...", new { @class = "form_dropdown_300" })%>
<%= Html.ValidationMessageFor(model => model.SelectedNCRType, "Required Field")%>

Helper Extension Method:
public static SelectList ToSelectList<T>(this IEnumerable<T> collection,
                         string dataValueField, string dataTextField)
    {
        return new SelectList(collection, dataValueField, dataTextField);
    }

如果您有任何想法，请帮助......这让我发疯。

Answer 1

我通过在行之前重新填充post action方法中的下拉控件来实现这一点：

返回视图（模型）;

MVC2下拉验证问题

1 个答案: