도면에서 표 추출

Models/TeighaServicesManager.cs

@@ -10,8 +10,8 @@ namespace DwgExtractorManual.Models
     public sealed class TeighaServicesManager
     {
         private static readonly object _lock = new object();
-        private static TeighaServicesManager _instance = null;
-        private static Services _services = null;
+        private static TeighaServicesManager? _instance = null;
+        private static Services? _services = null;
         private static int _referenceCount = 0;
         private static bool _isActivated = false;