MVC3的DropDownList不能与[必填]类字段类型为int验证？ [英] MVC3 DropDownList not validating with [Required] class field as type int?

问题描述

任何想法，为什么下面的DropDownList不会必填字段验证为int类型（标题的字段）？

Any idea why the following dropdownlist won't validate with required field as type int (the "Title" field below)?

    [Required]             // This works!
    [Display(Name = "Name")]
    public string Name { get; set; }

    [Required]             // This doesn't work 
    [Display(Name = "Title")]
    public int TitleId { get; set; }



     <div class="editor-label">
        @Html.LabelFor(model => model.Name, "Name")
    </div>
    <div class="editor-field">
        @Html.EditorFor(model => model.Name)
        @Html.ValidationMessageFor(model => model.Name, "This can't be blank!")
    </div>

    <div class="editor-label">
        @Html.LabelFor(model => model.TitleId, "Title")
    </div>
    <div class="editor-field">
         @Html.DropDownListFor(model => model.TitleId, (SelectList)ViewBag.TitleId, String.Empty)
        @Html.ValidationMessageFor(model => model.TitleId)
    </div>

推荐答案

根据这项工作项，当在ViewBag选择列表使用相同的名称有问题的领域客户端验证打破。 （即两者都是 TitleId 你的情况。）

According to this work item, client-side validation breaks when the SelectList in the ViewBag uses the same name as the field in question. (i.e. both are TitleId in your case.)

试试这个：

@Html.DropDownListFor(model => 
    model.TitleId, (SelectList)ViewBag.TitleIdList, String.Empty)

你的SelectList重命名为 TitleIdList 相应。

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