Migrate

microservices/apps/app-client-base-net/ViewModels/MainViewModel.cs

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+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using AppClientBase.Services;
+
+namespace AppClientBase.ViewModels;
+
+/// <summary>
+/// EN: Main page ViewModel.
+/// VI: ViewModel của trang chính.
+/// </summary>
+public partial class MainViewModel : BaseViewModel
+{
+    private readonly ISettingsService _settingsService;
+
+    /// <summary>
+    /// EN: Welcome message displayed on the main page.
+    /// VI: Thông điệp chào mừng hiển thị trên trang chính.
+    /// </summary>
+    [ObservableProperty]
+    private string _welcomeMessage = "Welcome to AppClientBase!";
+
+    /// <summary>
+    /// EN: Click counter for demonstration.
+    /// VI: Bộ đếm click để minh họa.
+    /// </summary>
+    [ObservableProperty]
+    private int _clickCount;
+
+    /// <summary>
+    /// EN: Button text that updates with click count.
+    /// VI: Text nút cập nhật theo số lần click.
+    /// </summary>
+    [ObservableProperty]
+    private string _buttonText = "Click me";
+
+    /// <summary>
+    /// EN: Constructor with required services.
+    /// VI: Constructor với các services cần thiết.
+    /// </summary>
+    public MainViewModel(
+        INavigationService navigationService,
+        ISettingsService settingsService) 
+        : base(navigationService)
+    {
+        _settingsService = settingsService;
+        Title = "Home";
+        
+        // Defer loading settings to avoid startup crash
+        // ClickCount will be loaded on first interaction
+    }
+
+    /// <summary>
+    /// EN: Increment click counter command.
+    /// VI: Command tăng bộ đếm click.
+    /// </summary>
+    [RelayCommand]
+    private void IncrementCounter()
+    {
+        ClickCount++;
+        try
+        {
+            _settingsService.Set("ClickCount", ClickCount);
+        }
+        catch
+        {
+            // Ignore settings errors
+        }
+        UpdateButtonText();
+    }
+
+    /// <summary>
+    /// EN: Update button text based on click count.
+    /// VI: Cập nhật text nút dựa trên số lần click.
+    /// </summary>
+    private void UpdateButtonText()
+    {
+        ButtonText = ClickCount switch
+        {
+            0 => "Click me",
+            1 => "Clicked 1 time",
+            _ => $"Clicked {ClickCount} times"
+        };
+    }
+}