RefitExtensions: Parse validation api exception to Dictionary<string, IEnumerable<string>>

RefitExtensions.cs

using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;
using Refit;

namespace Refit.Extensions
{

    public static class RefitExtensions
    {

        public static async Task<Dictionary<string, IEnumerable<string>>> GetValidationErrorsAsync(this ApiException refitException)
        {
            if (refitException is ValidationApiException == false)
                return null;
            var jsonException = await refitException.GetContentAsAsync<Dictionary<string, JsonElement>>();
            if (!jsonException.ContainsKey("errors"))            
                return null;
            

            var validationErrors = jsonException["errors"].EnumerateObject().Select(x => x);
            return validationErrors.ToDictionary(x => x.Name, x => x.Value.EnumerateArray().Select(j => j.GetString()));
        }
    }
}