Add JSON exception handling in App.xaml.cs

Co-authored-by: BornToBeRoot <[email protected]>

Author: Copilot

Source/NETworkManager/App.xaml.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics;
 using System.IO;
 using System.Linq;
+using System.Text.Json;
 using System.Threading;
 using System.Windows;
 using System.Windows.Threading;
@@ -108,6 +109,24 @@ by BornToBeRoot
             SettingsManager.Initialize();
             ConfigurationManager.Current.ShowSettingsResetNoteOnStartup = true;
         }
+        catch (JsonException ex)
+        {
+            Log.Error("Could not load application settings! JSON file is corrupted or invalid.");
+            Log.Error(ex.Message + "-" + ex.StackTrace);
+
+            // Create backup of corrupted file
+            var destinationFile =
+                $"{TimestampHelper.GetTimestamp()}_corrupted_" + SettingsManager.GetSettingsFileName();
+            File.Copy(SettingsManager.GetSettingsFilePath(),
+                Path.Combine(SettingsManager.GetSettingsFolderLocation(), destinationFile));
+            Log.Info($"A backup of the corrupted settings file has been saved under {destinationFile}");
+
+            // Initialize default application settings
+            Log.Info("Initialize default application settings...");
+
+            SettingsManager.Initialize();
+            ConfigurationManager.Current.ShowSettingsResetNoteOnStartup = true;
+        }
 
         // Upgrade settings if necessary
         var settingsVersion = Version.Parse(SettingsManager.Current.Version);