fix by sonar code smell

notus/Biblioteque_de_Class/Exception.cs

@@ -30,4 +30,15 @@ namespace Biblioteque_de_Class
         {
         }
     }
+
+
+
+
+
+    public class FileException : Exception
+    {
+        public FileException(string message) : base(message)
+        {
+        }
+    }
 }

notus/Biblioteque_de_Class/Note.cs

@@ -25,11 +25,11 @@ namespace Biblioteque_de_Class
 
         private DateOnly CreationDate { get; }
         private DateOnly ModificationDate { get; set; }
-        private List<NoteImage> ImageList;
+        private readonly List<NoteImage> ImageList;
         private string TextLine;
-        private List<User> Collaborators;
-        private List<User> Editors;
-        private User Owner;
+        private readonly List<User> Collaborators;
+        private readonly List<User> Editors;
+        private readonly User Owner;
 
         public Note(string name, string logoPath, User owner)
         {

notus/Biblioteque_de_Class/PersistenceManager.cs

@@ -4,7 +4,7 @@ namespace Biblioteque_de_Class
 {
     public class PersistenceManager
     {
-        private IManager persistence;
+        private readonly IManager persistence;
 
         public PersistenceManager(IManager pers)
         {

notus/Biblioteque_de_Class/Theme.cs

@@ -9,7 +9,7 @@ namespace Biblioteque_de_Class
     public class Theme
     {
         private string Name { get; set; }
-        private List<string> ColorList;
+        private readonly List<string> ColorList;
 
         public Theme(string name, List<string> colorList)
         {

notus/Notus_Persistence/ToJSON.cs

@@ -37,23 +37,22 @@ namespace Notus_Persistance
         {
             if (File.Exists(DatabaseDataFilePath))
             {
-                Database database1;
                 using (FileStream fileStream = File.OpenRead(DatabaseDataFilePath))
                 {
                     Database? database = (Database?)DatabasejsonSerializer.ReadObject(fileStream);
                     if (database == null)
                     {
-                        throw new Exception("Failed to load database. The loaded object is null.");
+                        throw new FileException("Failed to load database. The loaded object is null.");
                     }
                     else
                     {
-                        return database1 = database;
+                        return database;
                     }
                 }
             }
             else
             {
-                throw new Exception("No data file found.");
+                throw new FileException("No data file found.");
             }
         }
 
@@ -82,7 +81,7 @@ namespace Notus_Persistance
                     User? user = (User?)UserjsonSerializer.ReadObject(fileStream);
                     if (user == null)
                     {
-                        throw new Exception("Failed to load database. The loaded object is null.");
+                        throw new FileException("Failed to load database. The loaded object is null.");
                     }
                     else
                     {
@@ -92,7 +91,7 @@ namespace Notus_Persistance
             }
             else
             {
-                throw new Exception("No userfile find");
+                throw new FileException("No userfile find");
             }
         }
     }