Merge pull request #3547 from Flow-Launcher/setting_window_navigation_issue

jjw24 · web-flow · commit e80d191fb865 · 2025-05-16T17:03:17.000+10:00
Fix setting window navigation update issue
diff --git a/Flow.Launcher/Resources/Pages/WelcomePage1.xaml.cs b/Flow.Launcher/Resources/Pages/WelcomePage1.xaml.cs
@@ -9,20 +9,19 @@ namespace Flow.Launcher.Resources.Pages
 {
     public partial class WelcomePage1
     {
-        public Settings Settings { get; private set; }
-        private WelcomeViewModel _viewModel;
+        public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();
+        private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
 
         protected override void OnNavigatedTo(NavigationEventArgs e)
         {
+            // Sometimes the navigation is not triggered by button click,
+            // so we need to reset the page number
+            _viewModel.PageNum = 1;
+
             if (!IsInitialized)
             {
-                Settings = Ioc.Default.GetRequiredService<Settings>();
-                _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
                 InitializeComponent();
             }
-            // Sometimes the navigation is not triggered by button click,
-            // so we need to reset the page number
-            _viewModel.PageNum = 1;
             base.OnNavigatedTo(e);
         }
 
diff --git a/Flow.Launcher/Resources/Pages/WelcomePage2.xaml.cs b/Flow.Launcher/Resources/Pages/WelcomePage2.xaml.cs
@@ -11,20 +11,19 @@ namespace Flow.Launcher.Resources.Pages
 {
     public partial class WelcomePage2
     {
-        public Settings Settings { get; private set; }
-        private WelcomeViewModel _viewModel;
+        public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();
+        private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
 
         protected override void OnNavigatedTo(NavigationEventArgs e)
         {
+            // Sometimes the navigation is not triggered by button click,
+            // so we need to reset the page number
+            _viewModel.PageNum = 2;
+
             if (!IsInitialized)
             {
-                Settings = Ioc.Default.GetRequiredService<Settings>();
-                _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
                 InitializeComponent();
             }
-            // Sometimes the navigation is not triggered by button click,
-            // so we need to reset the page number
-            _viewModel.PageNum = 2;
             base.OnNavigatedTo(e);
         }
 
diff --git a/Flow.Launcher/Resources/Pages/WelcomePage3.xaml.cs b/Flow.Launcher/Resources/Pages/WelcomePage3.xaml.cs
@@ -7,20 +7,19 @@ namespace Flow.Launcher.Resources.Pages
 {
     public partial class WelcomePage3
     {
-        public Settings Settings { get; private set; }
-        private WelcomeViewModel _viewModel;
+        public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();
+        private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
 
         protected override void OnNavigatedTo(NavigationEventArgs e)
         {
+            // Sometimes the navigation is not triggered by button click,
+            // so we need to reset the page number
+            _viewModel.PageNum = 3;
+
             if (!IsInitialized)
             {
-                Settings = Ioc.Default.GetRequiredService<Settings>();
-                _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
                 InitializeComponent();
             }
-            // Sometimes the navigation is not triggered by button click,
-            // so we need to reset the page number
-            _viewModel.PageNum = 3;
             base.OnNavigatedTo(e);
         }
     }
diff --git a/Flow.Launcher/Resources/Pages/WelcomePage4.xaml.cs b/Flow.Launcher/Resources/Pages/WelcomePage4.xaml.cs
@@ -7,20 +7,19 @@ namespace Flow.Launcher.Resources.Pages
 {
     public partial class WelcomePage4
     {
-        public Settings Settings { get; private set; }
-        private WelcomeViewModel _viewModel;
+        public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();
+        private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
 
         protected override void OnNavigatedTo(NavigationEventArgs e)
         {
+            // Sometimes the navigation is not triggered by button click,
+            // so we need to reset the page number
+            _viewModel.PageNum = 4;
+
             if (!IsInitialized)
             {
-                Settings = Ioc.Default.GetRequiredService<Settings>();
-                _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
                 InitializeComponent();
             }
-            // Sometimes the navigation is not triggered by button click,
-            // so we need to reset the page number
-            _viewModel.PageNum = 4;
             base.OnNavigatedTo(e);
         }
     }
diff --git a/Flow.Launcher/Resources/Pages/WelcomePage5.xaml.cs b/Flow.Launcher/Resources/Pages/WelcomePage5.xaml.cs
@@ -10,20 +10,19 @@ namespace Flow.Launcher.Resources.Pages
 {
     public partial class WelcomePage5
     {
-        public Settings Settings { get; private set; }
-        private WelcomeViewModel _viewModel;
+        public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();
+        private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
 
         protected override void OnNavigatedTo(NavigationEventArgs e)
         {
+            // Sometimes the navigation is not triggered by button click,
+            // so we need to reset the page number
+            _viewModel.PageNum = 5;
+
             if (!IsInitialized)
             {
-                Settings = Ioc.Default.GetRequiredService<Settings>();
-                _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();
                 InitializeComponent();
             }
-            // Sometimes the navigation is not triggered by button click,
-            // so we need to reset the page number
-            _viewModel.PageNum = 5;
             base.OnNavigatedTo(e);
         }
 
diff --git a/Flow.Launcher/SettingPages/Views/SettingsPaneAbout.xaml.cs b/Flow.Launcher/SettingPages/Views/SettingsPaneAbout.xaml.cs
@@ -1,19 +1,29 @@
 ﻿using System.Windows.Navigation;
 using CommunityToolkit.Mvvm.DependencyInjection;
 using Flow.Launcher.SettingPages.ViewModels;
+using Flow.Launcher.ViewModel;
 
 namespace Flow.Launcher.SettingPages.Views;
 
 public partial class SettingsPaneAbout
 {
     private SettingsPaneAboutViewModel _viewModel = null!;
+    private readonly SettingWindowViewModel _settingViewModel = Ioc.Default.GetRequiredService<SettingWindowViewModel>();
 
     protected override void OnNavigatedTo(NavigationEventArgs e)
     {
-        if (!IsInitialized)
+        // Sometimes the navigation is not triggered by button click,
+        // so we need to reset the page type
+        _settingViewModel.PageType = typeof(SettingsPaneAbout);
+
+        // If the navigation is not triggered by button click, view model will be null again
+        if (_viewModel == null)
         {
             _viewModel = Ioc.Default.GetRequiredService<SettingsPaneAboutViewModel>();
             DataContext = _viewModel;
+        }
+        if (!IsInitialized)
+        {
             InitializeComponent();
         }
         base.OnNavigatedTo(e);
diff --git a/Flow.Launcher/SettingPages/Views/SettingsPaneGeneral.xaml.cs b/Flow.Launcher/SettingPages/Views/SettingsPaneGeneral.xaml.cs
@@ -1,19 +1,29 @@
 ﻿using System.Windows.Navigation;
 using CommunityToolkit.Mvvm.DependencyInjection;
 using Flow.Launcher.SettingPages.ViewModels;
+using Flow.Launcher.ViewModel;
 
 namespace Flow.Launcher.SettingPages.Views;
 
 public partial class SettingsPaneGeneral
 {
     private SettingsPaneGeneralViewModel _viewModel = null!;
+    private readonly SettingWindowViewModel _settingViewModel = Ioc.Default.GetRequiredService<SettingWindowViewModel>();
 
     protected override void OnNavigatedTo(NavigationEventArgs e)
     {
-        if (!IsInitialized)
+        // Sometimes the navigation is not triggered by button click,
+        // so we need to reset the page type
+        _settingViewModel.PageType = typeof(SettingsPaneGeneral);
+
+        // If the navigation is not triggered by button click, view model will be null again
+        if (_viewModel == null)
         {
             _viewModel = Ioc.Default.GetRequiredService<SettingsPaneGeneralViewModel>();
             DataContext = _viewModel;
+        }
+        if (!IsInitialized)
+        {
             InitializeComponent();
         }
         base.OnNavigatedTo(e);
diff --git a/Flow.Launcher/SettingPages/Views/SettingsPaneHotkey.xaml.cs b/Flow.Launcher/SettingPages/Views/SettingsPaneHotkey.xaml.cs
@@ -1,19 +1,29 @@
 ﻿using System.Windows.Navigation;
 using CommunityToolkit.Mvvm.DependencyInjection;
 using Flow.Launcher.SettingPages.ViewModels;
+using Flow.Launcher.ViewModel;
 
 namespace Flow.Launcher.SettingPages.Views;
 
 public partial class SettingsPaneHotkey
 {
     private SettingsPaneHotkeyViewModel _viewModel = null!;
+    private readonly SettingWindowViewModel _settingViewModel = Ioc.Default.GetRequiredService<SettingWindowViewModel>();
 
     protected override void OnNavigatedTo(NavigationEventArgs e)
     {
-        if (!IsInitialized)
+        // Sometimes the navigation is not triggered by button click,
+        // so we need to reset the page type
+        _settingViewModel.PageType = typeof(SettingsPaneHotkey);
+
+        // If the navigation is not triggered by button click, view model will be null again
+        if (_viewModel == null)
         {
             _viewModel = Ioc.Default.GetRequiredService<SettingsPaneHotkeyViewModel>();
             DataContext = _viewModel;
+        }
+        if (!IsInitialized)
+        {
             InitializeComponent();
         }
         base.OnNavigatedTo(e);
diff --git a/Flow.Launcher/SettingPages/Views/SettingsPanePluginStore.xaml.cs b/Flow.Launcher/SettingPages/Views/SettingsPanePluginStore.xaml.cs
@@ -11,13 +11,22 @@ namespace Flow.Launcher.SettingPages.Views;
 public partial class SettingsPanePluginStore
 {
     private SettingsPanePluginStoreViewModel _viewModel = null!;
+    private readonly SettingWindowViewModel _settingViewModel = Ioc.Default.GetRequiredService<SettingWindowViewModel>();
 
     protected override void OnNavigatedTo(NavigationEventArgs e)
     {
-        if (!IsInitialized)
+        // Sometimes the navigation is not triggered by button click,
+        // so we need to reset the page type
+        _settingViewModel.PageType = typeof(SettingsPanePluginStore);
+
+        // If the navigation is not triggered by button click, view model will be null again
+        if (_viewModel == null)
         {
             _viewModel = Ioc.Default.GetRequiredService<SettingsPanePluginStoreViewModel>();
             DataContext = _viewModel;
+        }
+        if (!IsInitialized)
+        {
             InitializeComponent();
         }
         _viewModel.PropertyChanged += ViewModel_PropertyChanged;
diff --git a/Flow.Launcher/SettingPages/Views/SettingsPanePlugins.xaml.cs b/Flow.Launcher/SettingPages/Views/SettingsPanePlugins.xaml.cs
@@ -11,13 +11,22 @@ namespace Flow.Launcher.SettingPages.Views;
 public partial class SettingsPanePlugins
 {
     private SettingsPanePluginsViewModel _viewModel = null!;
+    private readonly SettingWindowViewModel _settingViewModel = Ioc.Default.GetRequiredService<SettingWindowViewModel>();
 
     protected override void OnNavigatedTo(NavigationEventArgs e)
     {
-        if (!IsInitialized)
+        // Sometimes the navigation is not triggered by button click,
+        // so we need to reset the page type
+        _settingViewModel.PageType = typeof(SettingsPanePlugins);
+
+        // If the navigation is not triggered by button click, view model will be null again
+        if (_viewModel == null)
         {
             _viewModel = Ioc.Default.GetRequiredService<SettingsPanePluginsViewModel>();
             DataContext = _viewModel;
+        }
+        if (!IsInitialized)
+        {
             InitializeComponent();
         }
         _viewModel.PropertyChanged += ViewModel_PropertyChanged;
diff --git a/Flow.Launcher/SettingPages/Views/SettingsPaneProxy.xaml.cs b/Flow.Launcher/SettingPages/Views/SettingsPaneProxy.xaml.cs
@@ -1,19 +1,29 @@
 ﻿using System.Windows.Navigation;
 using CommunityToolkit.Mvvm.DependencyInjection;
 using Flow.Launcher.SettingPages.ViewModels;
+using Flow.Launcher.ViewModel;
 
 namespace Flow.Launcher.SettingPages.Views;
 
 public partial class SettingsPaneProxy
 {
     private SettingsPaneProxyViewModel _viewModel = null!;
+    private readonly SettingWindowViewModel _settingViewModel = Ioc.Default.GetRequiredService<SettingWindowViewModel>();
 
     protected override void OnNavigatedTo(NavigationEventArgs e)
     {
-        if (!IsInitialized)
+        // Sometimes the navigation is not triggered by button click,
+        // so we need to reset the page type
+        _settingViewModel.PageType = typeof(SettingsPaneProxy);
+
+        // If the navigation is not triggered by button click, view model will be null again
+        if (_viewModel == null)
         {
             _viewModel = Ioc.Default.GetRequiredService<SettingsPaneProxyViewModel>();
             DataContext = _viewModel;
+        }
+        if (!IsInitialized)
+        {
             InitializeComponent();
         }
         base.OnNavigatedTo(e);
diff --git a/Flow.Launcher/SettingPages/Views/SettingsPaneTheme.xaml.cs b/Flow.Launcher/SettingPages/Views/SettingsPaneTheme.xaml.cs
@@ -1,19 +1,29 @@
 ﻿using System.Windows.Navigation;
 using CommunityToolkit.Mvvm.DependencyInjection;
 using Flow.Launcher.SettingPages.ViewModels;
+using Flow.Launcher.ViewModel;
 
 namespace Flow.Launcher.SettingPages.Views;
 
 public partial class SettingsPaneTheme
 {
     private SettingsPaneThemeViewModel _viewModel = null!;
+    private readonly SettingWindowViewModel _settingViewModel = Ioc.Default.GetRequiredService<SettingWindowViewModel>();
 
     protected override void OnNavigatedTo(NavigationEventArgs e)
     {
-        if (!IsInitialized)
+        // Sometimes the navigation is not triggered by button click,
+        // so we need to reset the page type
+        _settingViewModel.PageType = typeof(SettingsPaneTheme);
+
+        // If the navigation is not triggered by button click, view model will be null again
+        if (_viewModel == null)
         {
             _viewModel = Ioc.Default.GetRequiredService<SettingsPaneThemeViewModel>();
             DataContext = _viewModel;
+        }
+        if (!IsInitialized)
+        {
             InitializeComponent();
         }
         base.OnNavigatedTo(e);
diff --git a/Flow.Launcher/SettingWindow.xaml.cs b/Flow.Launcher/SettingWindow.xaml.cs
diff --git a/Flow.Launcher/ViewModel/SettingWindowViewModel.cs b/Flow.Launcher/ViewModel/SettingWindowViewModel.cs

Original file line number	Diff line number	Diff line change
`@@ -9,20 +9,19 @@ namespace Flow.Launcher.Resources.Pages`
`9`	`9`	`{`
`10`	`10`	`public partial class WelcomePage1`
`11`	`11`	`{`
`12`		`- public Settings Settings { get; private set; }`
`13`		`- private WelcomeViewModel _viewModel;`
	`12`	`+ public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();`
	`13`	`+ private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`14`	`14`
`15`	`15`	`protected override void OnNavigatedTo(NavigationEventArgs e)`
`16`	`16`	`{`
	`17`	`+ // Sometimes the navigation is not triggered by button click,`
	`18`	`+ // so we need to reset the page number`
	`19`	`+ _viewModel.PageNum = 1;`
	`20`	`+`
`17`	`21`	`if (!IsInitialized)`
`18`	`22`	`{`
`19`		`- Settings = Ioc.Default.GetRequiredService<Settings>();`
`20`		`- _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`21`	`23`	`InitializeComponent();`
`22`	`24`	`}`
`23`		`- // Sometimes the navigation is not triggered by button click,`
`24`		`- // so we need to reset the page number`
`25`		`- _viewModel.PageNum = 1;`
`26`	`25`	`base.OnNavigatedTo(e);`
`27`	`26`	`}`
`28`	`27`
Original file line number	Diff line number	Diff line change
`@@ -11,20 +11,19 @@ namespace Flow.Launcher.Resources.Pages`
`11`	`11`	`{`
`12`	`12`	`public partial class WelcomePage2`
`13`	`13`	`{`
`14`		`- public Settings Settings { get; private set; }`
`15`		`- private WelcomeViewModel _viewModel;`
	`14`	`+ public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();`
	`15`	`+ private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`16`	`16`
`17`	`17`	`protected override void OnNavigatedTo(NavigationEventArgs e)`
`18`	`18`	`{`
	`19`	`+ // Sometimes the navigation is not triggered by button click,`
	`20`	`+ // so we need to reset the page number`
	`21`	`+ _viewModel.PageNum = 2;`
	`22`	`+`
`19`	`23`	`if (!IsInitialized)`
`20`	`24`	`{`
`21`		`- Settings = Ioc.Default.GetRequiredService<Settings>();`
`22`		`- _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`23`	`25`	`InitializeComponent();`
`24`	`26`	`}`
`25`		`- // Sometimes the navigation is not triggered by button click,`
`26`		`- // so we need to reset the page number`
`27`		`- _viewModel.PageNum = 2;`
`28`	`27`	`base.OnNavigatedTo(e);`
`29`	`28`	`}`
`30`	`29`
Original file line number	Diff line number	Diff line change
`@@ -7,20 +7,19 @@ namespace Flow.Launcher.Resources.Pages`
`7`	`7`	`{`
`8`	`8`	`public partial class WelcomePage3`
`9`	`9`	`{`
`10`		`- public Settings Settings { get; private set; }`
`11`		`- private WelcomeViewModel _viewModel;`
	`10`	`+ public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();`
	`11`	`+ private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`12`	`12`
`13`	`13`	`protected override void OnNavigatedTo(NavigationEventArgs e)`
`14`	`14`	`{`
	`15`	`+ // Sometimes the navigation is not triggered by button click,`
	`16`	`+ // so we need to reset the page number`
	`17`	`+ _viewModel.PageNum = 3;`
	`18`	`+`
`15`	`19`	`if (!IsInitialized)`
`16`	`20`	`{`
`17`		`- Settings = Ioc.Default.GetRequiredService<Settings>();`
`18`		`- _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`19`	`21`	`InitializeComponent();`
`20`	`22`	`}`
`21`		`- // Sometimes the navigation is not triggered by button click,`
`22`		`- // so we need to reset the page number`
`23`		`- _viewModel.PageNum = 3;`
`24`	`23`	`base.OnNavigatedTo(e);`
`25`	`24`	`}`
`26`	`25`	`}`
Original file line number	Diff line number	Diff line change
`@@ -7,20 +7,19 @@ namespace Flow.Launcher.Resources.Pages`
`7`	`7`	`{`
`8`	`8`	`public partial class WelcomePage4`
`9`	`9`	`{`
`10`		`- public Settings Settings { get; private set; }`
`11`		`- private WelcomeViewModel _viewModel;`
	`10`	`+ public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();`
	`11`	`+ private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`12`	`12`
`13`	`13`	`protected override void OnNavigatedTo(NavigationEventArgs e)`
`14`	`14`	`{`
	`15`	`+ // Sometimes the navigation is not triggered by button click,`
	`16`	`+ // so we need to reset the page number`
	`17`	`+ _viewModel.PageNum = 4;`
	`18`	`+`
`15`	`19`	`if (!IsInitialized)`
`16`	`20`	`{`
`17`		`- Settings = Ioc.Default.GetRequiredService<Settings>();`
`18`		`- _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`19`	`21`	`InitializeComponent();`
`20`	`22`	`}`
`21`		`- // Sometimes the navigation is not triggered by button click,`
`22`		`- // so we need to reset the page number`
`23`		`- _viewModel.PageNum = 4;`
`24`	`23`	`base.OnNavigatedTo(e);`
`25`	`24`	`}`
`26`	`25`	`}`
Original file line number	Diff line number	Diff line change
`@@ -10,20 +10,19 @@ namespace Flow.Launcher.Resources.Pages`
`10`	`10`	`{`
`11`	`11`	`public partial class WelcomePage5`
`12`	`12`	`{`
`13`		`- public Settings Settings { get; private set; }`
`14`		`- private WelcomeViewModel _viewModel;`
	`13`	`+ public Settings Settings { get; } = Ioc.Default.GetRequiredService<Settings>();`
	`14`	`+ private readonly WelcomeViewModel _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`15`	`15`
`16`	`16`	`protected override void OnNavigatedTo(NavigationEventArgs e)`
`17`	`17`	`{`
	`18`	`+ // Sometimes the navigation is not triggered by button click,`
	`19`	`+ // so we need to reset the page number`
	`20`	`+ _viewModel.PageNum = 5;`
	`21`	`+`
`18`	`22`	`if (!IsInitialized)`
`19`	`23`	`{`
`20`		`- Settings = Ioc.Default.GetRequiredService<Settings>();`
`21`		`- _viewModel = Ioc.Default.GetRequiredService<WelcomeViewModel>();`
`22`	`24`	`InitializeComponent();`
`23`	`25`	`}`
`24`		`- // Sometimes the navigation is not triggered by button click,`
`25`		`- // so we need to reset the page number`
`26`		`- _viewModel.PageNum = 5;`
`27`	`26`	`base.OnNavigatedTo(e);`
`28`	`27`	`}`
`29`	`28`
Original file line number	Diff line number	Diff line change
`@@ -11,13 +11,22 @@ namespace Flow.Launcher.SettingPages.Views;`
`11`	`11`	`public partial class SettingsPanePluginStore`
`12`	`12`	`{`
`13`	`13`	`private SettingsPanePluginStoreViewModel _viewModel = null!;`
	`14`	`+ private readonly SettingWindowViewModel _settingViewModel = Ioc.Default.GetRequiredService<SettingWindowViewModel>();`
`14`	`15`
`15`	`16`	`protected override void OnNavigatedTo(NavigationEventArgs e)`
`16`	`17`	`{`
`17`		`- if (!IsInitialized)`
	`18`	`+ // Sometimes the navigation is not triggered by button click,`
	`19`	`+ // so we need to reset the page type`
	`20`	`+ _settingViewModel.PageType = typeof(SettingsPanePluginStore);`
	`21`	`+`
	`22`	`+ // If the navigation is not triggered by button click, view model will be null again`
	`23`	`+ if (_viewModel == null)`
`18`	`24`	`{`
`19`	`25`	`_viewModel = Ioc.Default.GetRequiredService<SettingsPanePluginStoreViewModel>();`
`20`	`26`	`DataContext = _viewModel;`
	`27`	`+ }`
	`28`	`+ if (!IsInitialized)`
	`29`	`+ {`
`21`	`30`	`InitializeComponent();`
`22`	`31`	`}`
`23`	`32`	`_viewModel.PropertyChanged += ViewModel_PropertyChanged;`