Clientseitig wird nun auch verschiedene Sender Addressen in Gkv Erstellung ausgeschlossen

Shared/Extensions/StringExtensions.cs

@@ -1,4 +1,5 @@
-using System;
+using BS.Shared.Interface;
+using System;
 using System.Collections.Generic;
 using System.ComponentModel;
 using System.IO;
@@ -112,5 +113,23 @@ namespace BS.Shared.Extensions
 
             return rtn;
         }
+
+        public static bool AreAllTheSame(this IEnumerable<string> list)
+		{
+            if (list is null || !list.Any())
+                return true;
+
+            string init = list.First();
+			foreach (var str in list)
+			{
+                if (str != init)
+                    return false;
+			}
+
+            return true;
+		}
+
+        public static string SenderAddressToString(this IInvoiceBase invoiceBase)
+            => $"{invoiceBase.SenderStreet}, {invoiceBase.SenderTown}, {invoiceBase.SenderPostCode}";
     }
 }