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KretaWeb/Helpers/ModelStateDictionaryExtenstions.cs

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+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; }
+    }
+}