验证不适用于 mvc5 中的下拉菜单

Question

注意以下代码。我的问题是，自从将 mvc4 升级到 mvc5 后，下拉验证未正确完成。在下面的代码中，虽然我在模型中设置了下拉菜单是强制性的，但是如果用户没有 select 它，它不会给用户任何错误，并将在数据库中保存金额为零。

下拉菜单的样式已选择-jquery

我的模特：

[Required(ErrorMessage = "*")]
public int PaymentTypeID { get; set; }

我的代码：

<html>
<head>
    <script src="/Scripts/jquery-3.3.1.min.js" type="text/javascript"></script>
</head>

<body>

<div class="row">
        <div class="col-md-1">
            @Html.LabelFor(model => model.PaymentTypeID, new { @class = "control-lable" })
        </div>
        <div class="col-md-3">
            @Html.DropDownListFor(model => model.PaymentTypeID, (SelectList)(ViewData["PaymentTypelist"]), "Choose..", new { @class = "form-control chosen-select" })
        </div>
        <div class="col-md-2">
            @Html.ValidationMessageFor(model => model.PaymentTypeID)
        </div>
</div>

    <script src="/Scripts/Menu/html5shiv.js" type="text/javascript"></script>
    <script src="/Scripts/jquery-ui-1.12.1.min.js" type="text/javascript"></script>
    <script src="/Scripts/Menu/actions.js" type="text/javascript"></script>
    <script src="/Scripts/Menu/jquery.cookies.2.2.0.min.js" type="text/javascript"></script>


    <script src="/Scripts/bootstrap.min.js" type="text/javascript"></script>


    <script src="/Scripts/fontawesome-all.js"></script>


    <script src="/Scripts/modernizr-2.0.6-development-only.js" type="text/javascript"></script>

    <script src="/Scripts/enquire.js" type="text/javascript"></script>
    <script src="/Scripts/jquery.unobtrusive-ajax.min.js" type="text/javascript"></script>

    <script src="/Scripts/jquery.pnotify.min.js" type="text/javascript"></script>


    <script src="/Scripts/placeholdr.js" type="text/javascript"></script>
    <script src="/Scripts/respond.min.js" type="text/javascript"></script>
    <script src="/Scripts/chosen.jquery.js" type="text/javascript"></script>

    <script src="/Scripts/jquery.validate.min.js" type="text/javascript"></script>
    <script src="/Scripts/jquery.validate.unobtrusive.min.js" type="text/javascript"></script>


    <script src="/Scripts/knockout-3.4.2.js" type="text/javascript"></script>

    <script src="/Scripts/attachfiles.js"></script>


    <script src="/Scripts/jquery-ui-datetimepicker.min.js" type="text/javascript"></script>


</body>
</html>

Answer 1

RequiredAttribute 属性指定当验证表单上的字段时，该字段必须包含一个值。如果属性为 null、包含空字符串 ("") 或仅包含 white-space 个字符，则会引发验证异常。

因此 [Required] 仅适用于可空类型。尝试使用 Nullable<int> 或 int? 而不是 int.

[Required(ErrorMessage = "*")]
public int? PaymentTypeID { get; set; }

Answer 2

如果您不想使用@Mannan Bahelim 提供的上述可空类型，那么您可以使用此范围属性，它只允许大于零的整数。

 [Range(1, Int32.MaxValue, ErrorMessage = "*")]

验证不适用于 mvc5 中的下拉菜单

Validation does not apply to dropdowns in mvc5

asp.net-mvc

unobtrusive-validation