//using Microsoft.AspNetCore.Http;
//using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;
//using System;
//using System.ComponentModel.DataAnnotations;
//using System.IO;
//using System.Linq;

//namespace _0_Framework.Application
//{
//    public class FileExtentionLimitationAttribute : ValidationAttribute, IClientModelValidator
//    {
//        private readonly string[] _validExtentions;
//        public FileExtentionLimitationAttribute(string[] validExtentions)
//        {
//            _validExtentions = validExtentions;
//        }

//        public override bool IsValid(object value)
//        {
//            var file = value as IFormFile;
//            if (file == null) return true;
//            var fileExtention = Path.GetExtension(file.FileName);
//            return _validExtentions.Contains(fileExtention);
//        }

//        public void AddValidation(ClientModelValidationContext context)
//        {
//            //context.Attributes.Add("data-val", "true");
//            context.Attributes.Add("data-val-fileExtentionLimit", ErrorMessage);
//        }
//    }
//}