我正在尝试在asp.net core 1.0中的自定义验证属性中实现本地化。这是我的简化视图模型:
public class EditPasswordViewModel
{
[Required(ErrorMessage = "OldPasswordRequired")]
[DataType(DataType.Password)]
[CheckOldPassword(ErrorMessage = "OldPasswordWrong")]
public string OldPassword { get; set; }
}
“ OldPasswordRequired”的本地化工作正常。但是,自定义属性的本地化无法正常工作,并且始终返回“ OldPasswordWrong”消息。这是代码:
public class CheckOldPasswordAttribute : ValidationAttribute
{
protected override ValidationResult IsValid(object classInstance, ValidationContext validationContext)
{
if (oldPasswordSaved == oldPasswordTyped) //simplified
{
return ValidationResult.Success;
}
else
{
string errorMessage = FormatErrorMessage(ErrorMessageString);
return new ValidationResult(errorMessage);
}
}
}
ErrorMessageString始终为“ OldPasswordWrong”,而FormatErrorMessage始终返回“ OldPasswordWrong”。我究竟做错了什么?我正在使用新的asp.net核心数据注释本地化,所以我没有使用ErrorMessageResourceName和ErrorMessageResourceType属性(我没有任何ViewModel.Designer.cs)。
实现本地化适配器:
public class RequiredIfAttributeAdapter : AttributeAdapterBase<RequiredIfAttribute>
{
public RequiredIfAttributeAdapter(RequiredIfAttribute attribute, IStringLocalizer stringLocalizer) : base(attribute, stringLocalizer) {}
public override void AddValidation(ClientModelValidationContext context) {}
public override string GetErrorMessage(ModelValidationContextBase validationContext)
{
return GetErrorMessage(validationContext.ModelMetadata, validationContext.ModelMetadata.GetDisplayName());
}
}
实现适配器的提供程序:
public class CustomValidationAttributeAdapterProvider : IValidationAttributeAdapterProvider
{
private readonly IValidationAttributeAdapterProvider _baseProvider = new ValidationAttributeAdapterProvider();
public IAttributeAdapter GetAttributeAdapter(ValidationAttribute attribute, IStringLocalizer stringLocalizer)
{
if (attribute is RequiredIfAttribute)
return new RequiredIfAttributeAdapter(attribute as RequiredIfAttribute, stringLocalizer);
else
return _baseProvider.GetAttributeAdapter(attribute, stringLocalizer);
}
}
在Startup.cs中注册提供程序:
services.AddSingleton<IValidationAttributeAdapterProvider, CustomValidationAttributeAdapterProvider>();
对此博客的感谢:https : //blogs.msdn.microsoft.com/mvpawardprogram/2017/01/03/asp-net-core-mvc/
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