[fix:] csv-import now recognizes quotation marks

Tasks/CsvBuilder.cs

@@ -1,4 +1,5 @@
 using System.Collections.Generic;
+using System.Linq;
 using System.Text;
 
 namespace Logof_Client;
@@ -30,34 +31,45 @@ public class CsvBuilder
 
         result.AppendLine(Header);
         foreach (var l in KasAddressList.KasPersons)
-
-            result.AppendLine(
-                l.refsid + Separator +
-                l.anrede + Separator +
-                l.titel + Separator +
-                l.vorname + Separator +
-                l.adel + Separator +
-                l.name + Separator +
-                l.namezus + Separator +
-                l.anredzus + Separator +
-                l.strasse + Separator +
-                l.strasse2 + Separator +
-                l.plz + Separator +
-                l.ort + Separator +
-                l.land + Separator +
-                l.pplz + Separator +
-                l.postfach + Separator +
-                l.name1 + Separator +
-                l.name2 + Separator +
-                l.name3 + Separator +
-                l.name4 + Separator +
-                l.name5 + Separator +
-                l.funktion + Separator +
-                l.funktion2 + Separator +
-                l.abteilung + Separator +
-                l.funktionad);
+            result.AppendLine(string.Join(Separator, new[]
+            {
+                EscapeCsvField(l.refsid.ToString()),
+                EscapeCsvField(l.anrede),
+                EscapeCsvField(l.titel),
+                EscapeCsvField(l.vorname),
+                EscapeCsvField(l.adel),
+                EscapeCsvField(l.name),
+                EscapeCsvField(l.namezus),
+                EscapeCsvField(l.anredzus),
+                EscapeCsvField(l.strasse),
+                EscapeCsvField(l.strasse2),
+                EscapeCsvField(l.plz),
+                EscapeCsvField(l.ort),
+                EscapeCsvField(l.land),
+                EscapeCsvField(l.pplz),
+                EscapeCsvField(l.postfach),
+                EscapeCsvField(l.name1),
+                EscapeCsvField(l.name2),
+                EscapeCsvField(l.name3),
+                EscapeCsvField(l.name4),
+                EscapeCsvField(l.name5),
+                EscapeCsvField(l.funktion),
+                EscapeCsvField(l.funktion2),
+                EscapeCsvField(l.abteilung),
+                EscapeCsvField(l.funktionad)
+            }));
 
         // weitere Cases
         return result.ToString();
     }
-}
+
+    private string EscapeCsvField(string? value)
+    {
+        var field = value ?? string.Empty;
+        var mustQuote = field.Contains(Separator) || field.Contains('"') || field.Contains('\r') || field.Contains('\n');
+        if (!mustQuote)
+            return field;
+
+        return "\"" + field.Replace("\"", "\"\"") + "\"";
+    }
+}