Menurut saya ASP.NET Core MVC tidak lagi mendukung DataAnnotationsModelValidatorProvider.RegisterAdapter
. Solusi yang saya temukan adalah sebagai berikut:
Misalkan saya ingin mengubah Validator untuk RequiredAttribute
menjadi adaptor validator saya sendiri (MyRequiredAttributeAdaptor
), Mengubah pesan kesalahan default EmailAddressAttribute
, dan mengubah Sumber Pesan Kesalahan Lokal untuk 'CompareAttribute' menjadi pesan saya sendiri.
1- Buat ValidationAttributeAdapterProvider khusus
using Microsoft.AspNetCore.Mvc.DataAnnotations;
using Microsoft.AspNetCore.Mvc.DataAnnotations.Internal;
using Microsoft.Extensions.Localization;
using System.ComponentModel.DataAnnotations;
public class CustomValidationAttributeAdapterProvider
: ValidationAttributeAdapterProvider, IValidationAttributeAdapterProvider
{
public CustomValidationAttributeAdapterProvider() { }
IAttributeAdapter IValidationAttributeAdapterProvider.GetAttributeAdapter(
ValidationAttribute attribute,
IStringLocalizer stringLocalizer)
{
IAttributeAdapter adapter;
if (attribute is RequiredAttribute)
{
adapter = new MyRequiredAttributeAdaptor((RequiredAttribute) attribute, stringLocalizer);
}
else if (attribute is EmailAddressAttribute)
{
attribute.ErrorMessage = "Invalid Email Address.";
adapter = base.GetAttributeAdapter(attribute, stringLocalizer);
}
else if (attribute is CompareAttribute)
{
attribute.ErrorMessageResourceName = "InvalidCompare";
attribute.ErrorMessageResourceType = typeof(Resources.ValidationMessages);
var theNewattribute = attribute as CompareAttribute;
adapter = new CompareAttributeAdapter(theNewattribute, stringLocalizer);
}
else
{
adapter = base.GetAttributeAdapter(attribute, stringLocalizer);
}
return adapter;
}
}
2- Tambahkan CustomValidationAttributeAdapterProvider untuk memulai:
Tambahkan baris berikut ke public void ConfigureServices(IServiceCollection services)
di Startup.cs:
services.AddSingleton <IValidationAttributeAdapterProvider, CustomValidationAttributeAdapterProvider> ();
Berikut adalah adaptor MyRequiredAttributeAdaptor:
using System;
using System.ComponentModel.DataAnnotations;
using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
using Microsoft.Extensions.Localization;
using Microsoft.AspNetCore.Mvc.DataAnnotations.Internal;
public class MyRequiredAttributeAdaptor : AttributeAdapterBase<RequiredAttribute>
{
public MyRequiredAttributeAdaptor(RequiredAttribute attribute, IStringLocalizer stringLocalizer)
: base(attribute, stringLocalizer)
{
}
public override void AddValidation(ClientModelValidationContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
MergeAttribute(context.Attributes, "data-val", "true");
MergeAttribute(context.Attributes, "data-val-required", GetErrorMessage(context));
}
/// <inheritdoc />
public override string GetErrorMessage(ModelValidationContextBase validationContext)
{
if (validationContext == null)
{
throw new ArgumentNullException(nameof(validationContext));
}
return GetErrorMessage(validationContext.ModelMetadata, validationContext.ModelMetadata.GetDisplayName());
}
}
Referensi:
1- Lihat contoh Microsoft: Proyek entropi: Ini adalah contoh bagus untuk berbagai fitur .NET Core. Dalam pertanyaan ini: lihat implementasi MinLengthSixAttribute
dalam sampel Mvc.LocalizationSample.Web:
https://github.com/aspnet/Entropy/tree/master/samples/Mvc.LocalizationSample.Web
2- Untuk melihat cara kerja adaptor atribut, lihat asp.Microsoft.AspNetCore.Mvc.DataAnnotations di github:
https://github.com/aspnet/Mvc/tree/master/src/Microsoft.AspNetCore.Mvc.DataAnnotations
person
Amir
schedule
15.11.2016