[英]Client-side validation for custom StringLength validation attribute
I have the following custom validation attribute, which derives from StringLengthAttribute: 我有以下自定义验证属性,它派生自StringLengthAttribute:
public class StringLengthLocalizedAttribute : StringLengthAttribute
{
public StringLengthLocalizedAttribute(int maximumLength) : base(maximumLength)
{
var translator = DependencyResolver.Current.GetService<ITranslator();
var translatedValue = translator.Translate("MaxLengthTranslationKey", ErrorMessage);
ErrorMessage = translatedValue.Replace("{MaxLength}", maximumLength.ToString());
}
}
The only purpose of this custom attribute is to localize the ErrorMessage. 此自定义属性的唯一用途是本地化ErrorMessage。 The problem is, when I use this in my models it does not generate any client-side validation, but the standard StringLength attribute does.
问题是,当我在模型中使用它时,它不会生成任何客户端验证,但标准的StringLength属性会生成。
I don't see how my attribute differs in any way - since it derives from the StringLength attribute I shouldn't have to implement any additional functionality to get client side validation working? 我没有看到我的属性如何以任何方式有所不同 - 因为它派生自StringLength属性,我不应该实现任何其他功能来使客户端验证工作?
If you look at the source code for DataAnnotationsModelValidatorProvider, you'll see in the method BuildAttributeFactoriesDictionary that specific types of attributes are registered for client side validation - you have created a new type, hence no client side validation. 如果查看DataAnnotationsModelValidatorProvider的源代码,您将在方法BuildAttributeFactoriesDictionary中看到为客户端验证注册了特定类型的属性 - 您创建了一个新类型,因此没有客户端验证。
Thankfully, this also has a public method to add your own adapter and is easy to use in the simple case you give: 值得庆幸的是,这也有一个公共方法来添加自己的适配器,并且在您给出的简单情况下易于使用:
Firstly, you need an adapter that will provide the client validation rules: 首先,您需要一个提供客户端验证规则的适配器:
public class MyStringLengthAdapter : DataAnnotationsModelValidator<MyStringLengthAttribute>
{
public MyStringLengthAdapter(ModelMetadata metadata, ControllerContext context, MyStringLengthAttribute attribute)
: base(metadata, context, attribute)
{
}
public override IEnumerable<ModelClientValidationRule> GetClientValidationRules()
{
return new[] { new ModelClientValidationStringLengthRule(ErrorMessage, Attribute.MinimumLength, Attribute.MaximumLength) };
}
}
You then need to register this in the Application_Start method in Global.asax.cs like so: 然后,您需要在Global.asax.cs中的Application_Start方法中注册它,如下所示:
DataAnnotationsModelValidatorProvider.RegisterAdapter(typeof (MyStringLengthAttribute), typeof (MyStringLengthAdapter));
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