using Microsoft.AspNetCore.Mvc.ModelBinding.Validation;

namespace System.ComponentModel.DataAnnotations
{
    public class HtmlDataAttribute :Attribute,IClientModelValidator
    {
        public string Key { get; }
        public string Value { get; }

        public HtmlDataAttribute(string value,string key="data-my-group")
        {
            Value = value;
            Key = key;
        }
        public void AddValidation(ClientModelValidationContext context)
        {
            var attributes = context.Attributes;
            if (!attributes.ContainsKey(Key))
            {
                attributes.Add(Key, Value);
            }
        }
    }

}