iot/labs/Teacher/Infrastructure/Web/LocalizedValidationMetadataProvider.cs

using Microsoft.AspNetCore.Mvc.ModelBinding.Metadata;
using Microsoft.Extensions.Localization;
using System.ComponentModel.DataAnnotations;
using System.Reflection;

namespace Infrastructure.Web
{
    public class LocalizedValidationMetadataProvider : IValidationMetadataProvider
    {
        private IStringLocalizer _localizer;

        public LocalizedValidationMetadataProvider(IStringLocalizerFactory factory)
        {
            this._localizer = factory.Create("Resources.Resource", Assembly.GetEntryAssembly().GetName().Name);
        }

        public void CreateValidationMetadata(ValidationMetadataProviderContext context)
        {
            var assembly = Assembly.GetExecutingAssembly();
            var resources = assembly.GetManifestResourceNames();
            foreach (var res in resources)
            {
                System.Diagnostics.Debug.WriteLine($"resource:{res} ");
            }
            foreach (var attribute in context.ValidationMetadata.ValidatorMetadata)
            {
                var validationAttribute = attribute as ValidationAttribute;
                if (validationAttribute != null && validationAttribute.ErrorMessage == null && validationAttribute.ErrorMessageResourceName == null)
                {
                    var name = validationAttribute.GetType().Name;
                    validationAttribute.ErrorMessage = _localizer.GetString(name); 
                }
            }
        }
    }
}