MaxLength 属性不生成客户端验证属性 [英] MaxLength Attribute not generating client-side validation attributes

问题描述

我对 ASP.NET MVC3 客户端验证有一个奇怪的问题.我有以下课程:

公共类仪器:BaseObject{公共 int Id { 获取；放;}[必填(ErrorMessage = "姓名是必填项.")][MaxLength(40, ErrorMessage = "名称不能超过 40 个字符.")]公共字符串名称 { 获取；放;}}

在我看来:

@Html.EditorFor(model => model.Name)@Html.ValidationMessageFor(model =>model.Name)

这是我为该字段的文本框生成的 HTML:

<input class="text-box single-line" data-val="true" data-val-required="名称为必填项."id="Name" name="Name" type="text" value="">

没有 MaxLengthAttribute 的迹象，但其他一切似乎都在工作.

知道出了什么问题吗?

解决方案

尝试使用 [StringLength] 属性:

[Required(ErrorMessage = "Name is required.")][StringLength(40, ErrorMessage = "名称不能超过 40 个字符.")]公共字符串名称 { 获取；放;}

这是为了验证目的.例如，如果您想在输入上设置 maxlength 属性，您可以将自定义数据注释元数据提供程序编写为 显示在这篇文章并自定义默认模板.

I have a curious problem with ASP.NET MVC3 client-side validation. I have the following class:

public class Instrument : BaseObject
{
    public int Id { get; set; }

    [Required(ErrorMessage = "Name is required.")]
    [MaxLength(40, ErrorMessage = "Name cannot be longer than 40 characters.")]
    public string Name { get; set; }
}

From my view:

<div class="editor-field">
    @Html.EditorFor(model => model.Name)
    @Html.ValidationMessageFor(model => model.Name)
</div>

And here's the generated HTML I get for the textbox for this field:

<input class="text-box single-line" data-val="true" data-val-required="Name is required." id="Name" name="Name" type="text" value="">

No sign of the MaxLengthAttribute, but everything else seems to be working.

Any ideas what's going wrong?

解决方案

Try using the [StringLength] attribute:

[Required(ErrorMessage = "Name is required.")]
[StringLength(40, ErrorMessage = "Name cannot be longer than 40 characters.")]
public string Name { get; set; }

That's for validation purposes. If you want to set for example the maxlength attribute on the input you could write a custom data annotations metadata provider as shown in this post and customize the default templates.

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