ASP.NET Core 自定义验证属性本地化

问题描述

我正在尝试在 asp.net core 1.0 的自定义验证属性中实现本地化.这是我的简化视图模型:

I'm trying to implement localization in a custom validation attribute in asp.net core 1.0. This is my simplified viewmodel:

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，我的自定义属性的本地化不起作用，并且总是返回OldPasswordWrong"消息.这是代码:

The localization of "OldPasswordRequired" is working fine. However the localization of my custom attribute is not working and returns always "OldPasswordWrong" message. This is the code:

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).

ErrorMessageString is always "OldPasswordWrong" and FormatErrorMessage returns always "OldPasswordWrong". What am I doing wrong?I'm using the new asp.net core data annotations localizations, so I'm not using ErrorMessageResourceName and ErrorMessageResourceType attributes (I don't have any ViewModel.Designer.cs).

推荐答案

实现一个本地化适配器:

Implement an adapter for localization:

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());
    }
}

为适配器实现提供程序:

Implement a provider for the adapter(s):

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:

Register the provider in Startup.cs:

services.AddSingleton<IValidationAttributeAdapterProvider, CustomValidationAttributeAdapterProvider>();

此博客的致谢:https://blogs.msdn.microsoft.com/mvpawardprogram/2017/01/03/asp-net-core-mvc/

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