kreta/KretaWeb/Helpers/ModelStateDictionaryExtenstions.cs

using System.Linq;
using System.Web.Http.ModelBinding;
using Newtonsoft.Json;

namespace Kreta.Web.Helpers
{
    public static class ModelStateDictionaryExtenstions
    {
        public static void AddModelStateErrorsFromString(this ModelStateDictionary modelState, string errors)
        {
            if (string.IsNullOrWhiteSpace(errors))
            {
                return;
            }

            var errorContent = JsonConvert.DeserializeObject<HttpClientErrorContent>(errors);

            if (errorContent != null)
            {
                var errorList = errorContent.Message.Split(';');
                if (errorList.Any())
                {
                    int i = 1;
                    foreach (var error in errorList)
                    {
                        if (!string.IsNullOrWhiteSpace(error))
                        {
                            modelState.AddModelError(i.ToString(), error);
                            i++;
                        }
                    }
                }
            }
        }
    }

    public class HttpClientErrorContent
    {
        public string Message { get; set; }
    }
}