From b4eecbdb86f650af00a400c1d2759ef4dcb4b9dd Mon Sep 17 00:00:00 2001
From: pitzm <m.pitz@digitaldata.works>
Date: Thu, 2 Apr 2026 11:46:20 +0200
Subject: [PATCH] ZUGFERD 20007 - BT-Felder-Liste anzeigen, mehrsprachig

---
 .../Controllers/ValidationController.cs       | 30 +++++++++++++++++--
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs b/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs
index fb4e33be..790c3623 100644
--- a/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs
+++ b/WEBSERVICES/ZUGFeRDRESTService/Controllers/ValidationController.cs
@@ -248,7 +248,7 @@ namespace ZUGFeRDRESTService.Controllers
                 // DEFAULT-Sprache = Deutsch de-DE
                 _UserLanguageCode = GERMAN;
             }
-            else if (_AllowedLanguageCodes.Contains(oLanguageId))
+            else if (_AllowedLanguageCodes.Where(i => i.Equals(oLanguageId, StringComparison.OrdinalIgnoreCase)).FirstOrDefault() != null)
             {
                 _logger.Info("Language code is allowed. Set to [{0}].", oLanguageId);
                 _UserLanguageCode = oLanguageId;
@@ -389,8 +389,12 @@ namespace ZUGFeRDRESTService.Controllers
                     switch (ex.ErrorCode)
                     {
                         case ErrorCodes.MissingValueException:
-                            oErrors.AddRange(from item in oPropertyResult.MissingProperties
-                                             select (item.EN16931_ID + " (" + item.Description + ")"));
+
+                            var oErrorsText = GetMissingValuesListString(oPropertyResult.MissingProperties);
+                            if (!string.IsNullOrEmpty(oErrorsText) && oMessage.Contains("@REPLACE_PARAM3", StringComparison.OrdinalIgnoreCase))
+                            {
+                                oMessage = Regex.Replace(oMessage, "@REPLACE_PARAM3", oErrorsText, RegexOptions.IgnoreCase);
+                            }
                             break;
                         default:
                             break;
@@ -485,6 +489,26 @@ namespace ZUGFeRDRESTService.Controllers
             }
         }
 
+        private string GetMissingValuesListString(List<MissingProperty> missingProperties)
+        {
+            if (missingProperties == null || missingProperties.Count == 0)
+            {
+                return string.Empty;
+            }
+
+            string retValue = "<ul>";
+            foreach (var missingProperty in missingProperties) 
+            {
+                var searchToken = missingProperty.EN16931_ID + "_Description";
+                var descriptionTranslated = GetTextByToken(searchToken);
+                var rowString = "<li>" + missingProperty.EN16931_ID + " (" + descriptionTranslated + ")</li>";
+                retValue += rowString;
+            }
+            retValue += "</ul>";
+
+            return retValue;
+        }
+
         /// <summary>
         /// Holt sprachgenauen Text anhand eines Titel-Tokens
         /// </summary>