Merge pull request #43 from AndreasReitberger/42-catch-and-process-en…

…cryption-errors

Add `Event` for `EncryptionErrors`

src/MauiSettings/Enums/MauiSettingsResults.cs

@@ -0,0 +1,10 @@
+namespace AndreasReitberger.Maui.Enums
+{
+    public enum MauiSettingsResults
+    {
+        Success,
+        Skipped,
+        EncryptionError,
+        Failed,
+    }
+}

src/MauiSettings/Events/EncryptionErrorEventArgs.cs

@@ -0,0 +1,8 @@
+namespace AndreasReitberger.Maui.Events
+{
+    public partial class EncryptionErrorEventArgs : EventArgs
+    {
+        public Exception? Exception { get; set; }
+        public string Key { get; set; } = string.Empty;
+    }
+}

src/MauiSettings/Helper/MauiSettingsHelper.cs

@@ -16,7 +16,7 @@ internal class MauiSettingsHelper
          * - String
          * - DateTime
         */
-        public static T GetSettingsValue<T>(string key, T defaultValue)
+        public static T? GetSettingsValue<T>(string key, T defaultValue)
         {
             object? returnValue = null;
             try
@@ -73,17 +73,18 @@ public static T GetSettingsValue<T>(string key, T defaultValue)
             //return (T)Convert.ChangeType(returnValue, typeof(T));
         }
 
-        public static T ChangeSettingsType<T>(object settingsValue, T defaultValue) => (T)Convert.ChangeType(settingsValue, typeof(T));
+        public static T? ChangeSettingsType<T>(object settingsValue, T defaultValue) => (T)Convert.ChangeType(settingsValue, typeof(T)) ?? default;
 
         // Docs: https://docs.microsoft.com/en-us/dotnet/maui/platform-integration/storage/secure-storage?tabs=ios
         // Only string is allowed for secure storage
-        public static async Task<string> GetSecureSettingsValueAsync(string key, string defaultValue)
+        public static async Task<string> GetSecureSettingsValueAsync(string key, string? defaultValue)
         {
+            defaultValue ??= string.Empty;
             string? settingsObject = await SecureStorage.Default.GetAsync(key);
             return settingsObject == null ? defaultValue : settingsObject;
         }
 
-        public static void SetSettingsValue(string key, object value)
+        public static void SetSettingsValue(string key, object? value)
         {
             switch (value)
             {