Add chapter 10 sample project

Chapter10/TemplateStudioSampleApp/Services/LocalSettingsService.cs

@@ -0,0 +1,88 @@
+using Microsoft.Extensions.Options;
+
+using TemplateStudioSampleApp.Contracts.Services;
+using TemplateStudioSampleApp.Core.Contracts.Services;
+using TemplateStudioSampleApp.Core.Helpers;
+using TemplateStudioSampleApp.Helpers;
+using TemplateStudioSampleApp.Models;
+
+using Windows.ApplicationModel;
+using Windows.Storage;
+
+namespace TemplateStudioSampleApp.Services;
+
+public class LocalSettingsService : ILocalSettingsService
+{
+    private const string _defaultApplicationDataFolder = "TemplateStudioSampleApp/ApplicationData";
+    private const string _defaultLocalSettingsFile = "LocalSettings.json";
+
+    private readonly IFileService _fileService;
+    private readonly LocalSettingsOptions _options;
+
+    private readonly string _localApplicationData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+    private readonly string _applicationDataFolder;
+    private readonly string _localsettingsFile;
+
+    private IDictionary<string, object> _settings;
+
+    private bool _isInitialized;
+
+    public LocalSettingsService(IFileService fileService, IOptions<LocalSettingsOptions> options)
+    {
+        _fileService = fileService;
+        _options = options.Value;
+
+        _applicationDataFolder = Path.Combine(_localApplicationData, _options.ApplicationDataFolder ?? _defaultApplicationDataFolder);
+        _localsettingsFile = _options.LocalSettingsFile ?? _defaultLocalSettingsFile;
+
+        _settings = new Dictionary<string, object>();
+    }
+
+    private async Task InitializeAsync()
+    {
+        if (!_isInitialized)
+        {
+            _settings = await Task.Run(() => _fileService.Read<IDictionary<string, object>>(_applicationDataFolder, _localsettingsFile)) ?? new Dictionary<string, object>();
+
+            _isInitialized = true;
+        }
+    }
+
+    public async Task<T?> ReadSettingAsync<T>(string key)
+    {
+        if (RuntimeHelper.IsMSIX)
+        {
+            if (ApplicationData.Current.LocalSettings.Values.TryGetValue(key, out var obj))
+            {
+                return await Json.ToObjectAsync<T>((string)obj);
+            }
+        }
+        else
+        {
+            await InitializeAsync();
+
+            if (_settings != null && _settings.TryGetValue(key, out var obj))
+            {
+                return await Json.ToObjectAsync<T>((string)obj);
+            }
+        }
+
+        return default;
+    }
+
+    public async Task SaveSettingAsync<T>(string key, T value)
+    {
+        if (RuntimeHelper.IsMSIX)
+        {
+            ApplicationData.Current.LocalSettings.Values[key] = await Json.StringifyAsync(value);
+        }
+        else
+        {
+            await InitializeAsync();
+
+            _settings[key] = await Json.StringifyAsync(value);
+
+            await Task.Run(() => _fileService.Save(_applicationDataFolder, _localsettingsFile, _settings));
+        }
+    }
+}