0.5.20

我认为很稳定了，后面就要开始弄插件不稳定了

LanMountainDesktop/Views/Components/BrowserWidget.axaml.cs

@@ -6,21 +6,27 @@ using Avalonia.Interactivity;
 using Avalonia.Media;
 using Avalonia.Styling;
 using AvaloniaWebView;
+using LanMountainDesktop.ComponentSystem;
 using LanMountainDesktop.Services;
 using WebViewCore.Events;
 
 namespace LanMountainDesktop.Views.Components;
 
-public partial class BrowserWidget : UserControl, IDesktopComponentWidget
-    , IDesktopPageVisibilityAwareComponentWidget, IDisposable
+public partial class BrowserWidget : UserControl, IDesktopComponentWidget,
+    IDesktopPageVisibilityAwareComponentWidget, IComponentPlacementContextAware, IDisposable
 {
     private static readonly Uri DefaultHomeUri = new("https://www.bing.com");
+
     private double _currentCellSize = 48;
+    private string _componentId = BuiltInComponentIds.DesktopBrowser;
+    private string _placementId = string.Empty;
     private bool? _isNightModeApplied;
     private Uri _lastKnownUri = DefaultHomeUri;
     private bool _isOnActiveDesktopPage;
+    private bool _isAttachedToVisualTree;
     private bool _isEditMode;
     private bool _isWebViewActive = true;
+    private bool _isWebViewFaulted;
     private readonly WebView2RuntimeAvailability _runtimeAvailability;
     private bool _isDisposed;
 
@@ -45,8 +51,8 @@ public partial class BrowserWidget : UserControl, IDesktopComponentWidget
             ApplyRuntimeUnavailableState();
         }
 
+        AddressTextBox.Text = DefaultHomeUri.ToString();
         UpdateWebViewActiveState();
-        NavigateTo(DefaultHomeUri);
     }
 
     public void Dispose()
@@ -74,17 +80,15 @@ public partial class BrowserWidget : UserControl, IDesktopComponentWidget
         _currentCellSize = Math.Max(1, cellSize);
 
         RootBorder.CornerRadius = new CornerRadius(Math.Clamp(_currentCellSize * 0.34, 12, 28));
-        RootBorder.Padding = new Thickness(
-            Math.Clamp(_currentCellSize * 0.20, 8, 18));
+        RootBorder.Padding = new Thickness(Math.Clamp(_currentCellSize * 0.20, 8, 18));
 
         WebViewHostBorder.CornerRadius = new CornerRadius(Math.Clamp(_currentCellSize * 0.24, 10, 22));
         AddressBarBorder.CornerRadius = new CornerRadius(Math.Clamp(_currentCellSize * 0.22, 10, 20));
         AddressBarBorder.Padding = new Thickness(8, 6);
 
-        var rowSpacing = 8d;
         if (RootBorder.Child is Grid rootGrid)
         {
-            rootGrid.RowSpacing = rowSpacing;
+            rootGrid.RowSpacing = 8d;
         }
 
         var buttonSize = Math.Clamp(_currentCellSize * 0.72, 30, 36);
@@ -111,16 +115,33 @@ public partial class BrowserWidget : UserControl, IDesktopComponentWidget
         AddressTextBox.Height = buttonSize;
     }
 
+    public void SetDesktopPageContext(bool isOnActivePage, bool isEditMode)
+    {
+        _isOnActiveDesktopPage = isOnActivePage;
+        _isEditMode = isEditMode;
+        UpdateWebViewActiveState();
+    }
+
+    public void SetComponentPlacementContext(string componentId, string? placementId)
+    {
+        _componentId = string.IsNullOrWhiteSpace(componentId)
+            ? BuiltInComponentIds.DesktopBrowser
+            : componentId.Trim();
+        _placementId = placementId?.Trim() ?? string.Empty;
+    }
+
     private void OnAttachedToVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
     {
+        _isAttachedToVisualTree = true;
         ApplyTheme(force: true);
         UpdateWebViewActiveState();
     }
 
     private void OnDetachedFromVisualTree(object? sender, VisualTreeAttachmentEventArgs e)
     {
+        _isAttachedToVisualTree = false;
         _isOnActiveDesktopPage = false;
-        UpdateWebViewActiveState();
+        DeactivateWebView(clearUrl: false);
     }
 
     private void OnSizeChanged(object? sender, SizeChangedEventArgs e)
@@ -202,28 +223,20 @@ public partial class BrowserWidget : UserControl, IDesktopComponentWidget
 
     private void OnRefreshButtonClick(object? sender, RoutedEventArgs e)
     {
-        if (!_runtimeAvailability.IsAvailable)
+        if (!CanUseWebView())
         {
             return;
         }
 
-        if (!_isWebViewActive)
+        if (!TryReloadWebView("Refresh"))
         {
-            return;
+            TryNavigate(DefaultHomeUri, "RefreshFallback");
         }
-
-        if (BrowserWebView.Url is not null)
-        {
-            BrowserWebView.Reload();
-            return;
-        }
-
-        NavigateTo(DefaultHomeUri);
     }
 
     private void OnGoButtonClick(object? sender, RoutedEventArgs e)
     {
-        if (!_runtimeAvailability.IsAvailable)
+        if (!CanUseWebView())
         {
             return;
         }
@@ -233,7 +246,7 @@ public partial class BrowserWidget : UserControl, IDesktopComponentWidget
 
     private void OnAddressTextBoxKeyDown(object? sender, KeyEventArgs e)
     {
-        if (!_runtimeAvailability.IsAvailable)
+        if (!CanUseWebView())
         {
             return;
         }
@@ -249,7 +262,7 @@ public partial class BrowserWidget : UserControl, IDesktopComponentWidget
 
     private void NavigateFromAddressBar()
     {
-        if (!_runtimeAvailability.IsAvailable)
+        if (!CanUseWebView())
         {
             return;
         }
@@ -269,7 +282,7 @@ public partial class BrowserWidget : UserControl, IDesktopComponentWidget
         AddressTextBox.Text = uri.ToString();
         if (_isWebViewActive)
         {
-            BrowserWebView.Url = uri;
+            TryNavigate(uri, "NavigateTo");
         }
     }
 
@@ -284,25 +297,16 @@ public partial class BrowserWidget : UserControl, IDesktopComponentWidget
         AddressTextBox.Text = e.Url.ToString();
     }
 
-    public void SetDesktopPageContext(bool isOnActivePage, bool isEditMode)
-    {
-        _isOnActiveDesktopPage = isOnActivePage;
-        _isEditMode = isEditMode;
-        UpdateWebViewActiveState();
-    }
-
     private void UpdateWebViewActiveState()
     {
-        if (!_runtimeAvailability.IsAvailable)
+        if (!_runtimeAvailability.IsAvailable || _isWebViewFaulted)
         {
             _isWebViewActive = false;
-            BrowserWebView.Url = null;
-            BrowserWebView.IsVisible = false;
-            BrowserWebView.IsHitTestVisible = false;
+            ApplyRuntimeUnavailableState();
             return;
         }
 
-        var shouldBeActive = _isOnActiveDesktopPage && !_isEditMode && IsVisible;
+        var shouldBeActive = _isAttachedToVisualTree && _isOnActiveDesktopPage && !_isEditMode && IsVisible;
         if (_isWebViewActive == shouldBeActive)
         {
             return;
@@ -311,40 +315,118 @@ public partial class BrowserWidget : UserControl, IDesktopComponentWidget
         _isWebViewActive = shouldBeActive;
         if (!_isWebViewActive)
         {
-            if (BrowserWebView.Url is Uri currentUri)
-            {
-                _lastKnownUri = currentUri;
-            }
+            DeactivateWebView(clearUrl: false);
+            return;
+        }
 
-            BrowserWebView.IsHitTestVisible = false;
-            BrowserWebView.IsVisible = false;
-            BrowserWebView.Url = null;
+        ActivateWebView();
+    }
+
+    private void ActivateWebView()
+    {
+        if (_isWebViewFaulted || !_runtimeAvailability.IsAvailable)
+        {
+            ApplyRuntimeUnavailableState();
             return;
         }
 
         BrowserWebView.IsVisible = true;
         BrowserWebView.IsHitTestVisible = true;
-        BrowserWebView.Url = _lastKnownUri;
+        RefreshButton.IsEnabled = true;
+        GoButton.IsEnabled = true;
+        AddressTextBox.IsEnabled = true;
+        UnavailableOverlay.IsVisible = false;
+
+        TryNavigate(_lastKnownUri, "Activate");
+    }
+
+    private void DeactivateWebView(bool clearUrl)
+    {
+        BrowserWebView.IsHitTestVisible = false;
+        BrowserWebView.IsVisible = false;
+
+        if (clearUrl)
+        {
+            TryClearWebViewUrl();
+        }
+    }
+
+    private bool TryReloadWebView(string action)
+    {
+        try
+        {
+            BrowserWebView.Reload();
+            return true;
+        }
+        catch (Exception ex) when (!UiExceptionGuard.IsFatalException(ex))
+        {
+            EnterFaultedState(action, ex);
+            return false;
+        }
+    }
+
+    private bool TryNavigate(Uri uri, string action)
+    {
+        try
+        {
+            BrowserWebView.Url = uri;
+            return true;
+        }
+        catch (Exception ex) when (!UiExceptionGuard.IsFatalException(ex))
+        {
+            EnterFaultedState(action, ex);
+            return false;
+        }
+    }
+
+    private void TryClearWebViewUrl()
+    {
+        try
+        {
+            BrowserWebView.Url = null;
+        }
+        catch
+        {
+            // Best-effort cleanup only.
+        }
+    }
+
+    private bool CanUseWebView()
+    {
+        return _runtimeAvailability.IsAvailable && !_isWebViewFaulted && _isWebViewActive;
     }
 
     private void ApplyRuntimeUnavailableState()
     {
         _isWebViewActive = false;
-        BrowserWebView.Url = null;
         BrowserWebView.IsVisible = false;
         BrowserWebView.IsHitTestVisible = false;
 
         RefreshButton.IsEnabled = false;
         GoButton.IsEnabled = false;
         AddressTextBox.IsEnabled = false;
-        AddressTextBox.Text = string.Empty;
+        AddressTextBox.Text = _lastKnownUri.ToString();
 
-        UnavailableMessageTextBlock.Text = string.IsNullOrWhiteSpace(_runtimeAvailability.Message)
-            ? "WebView runtime unavailable."
-            : _runtimeAvailability.Message;
+        UnavailableMessageTextBlock.Text = _isWebViewFaulted
+            ? "The browser component is temporarily unavailable. Restart the app to retry."
+            : string.IsNullOrWhiteSpace(_runtimeAvailability.Message)
+                ? "WebView runtime unavailable."
+                : _runtimeAvailability.Message;
         UnavailableOverlay.IsVisible = true;
     }
 
+    private void EnterFaultedState(string action, Exception ex)
+    {
+        _isWebViewFaulted = true;
+        _isWebViewActive = false;
+        AppLogger.Warn(
+            "BrowserWidget",
+            $"Browser component faulted. Action={action}; ComponentId={_componentId}; PlacementId={_placementId}; RuntimeAvailability={_runtimeAvailability.IsAvailable}; RuntimeVersion={_runtimeAvailability.Version ?? string.Empty}; CurrentUrl={_lastKnownUri}",
+            ex);
+        TryClearWebViewUrl();
+        ApplyRuntimeUnavailableState();
+    }
+
     private static Uri? TryNormalizeUri(string? rawText)
     {
         if (string.IsNullOrWhiteSpace(rawText))

LanMountainDesktop/Views/Components/DesktopComponentFailureView.cs

@@ -0,0 +1,226 @@
+using System;
+using System.Reflection;
+using System.Text;
+using System.Threading.Tasks;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Layout;
+using Avalonia.Media;
+using LanMountainDesktop.Services;
+
+namespace LanMountainDesktop.Views.Components;
+
+internal sealed class DesktopComponentFailureView : UserControl, IDesktopComponentWidget
+{
+    private readonly Border _rootBorder;
+    private readonly TextBlock _titleBlock;
+    private readonly TextBlock _summaryBlock;
+    private readonly TextBlock _statusBlock;
+    private readonly Button _toggleDetailsButton;
+    private readonly Button _copyReportButton;
+    private readonly Border _detailsBorder;
+    private readonly TextBox _reportTextBox;
+    private readonly string _componentId;
+    private readonly string? _placementId;
+    private readonly string _reportText;
+    private bool _detailsVisible;
+
+    public DesktopComponentFailureView(
+        string componentName,
+        string componentId,
+        string? placementId,
+        int? pageIndex,
+        string action,
+        Exception exception)
+    {
+        _componentId = componentId;
+        _placementId = placementId;
+        _reportText = BuildReport(componentName, componentId, placementId, pageIndex, action, exception);
+
+        _titleBlock = new TextBlock
+        {
+            Text = string.IsNullOrWhiteSpace(componentName) ? "组件暂时不可用" : componentName,
+            FontWeight = FontWeight.SemiBold,
+            TextWrapping = TextWrapping.Wrap
+        };
+
+        _summaryBlock = new TextBlock
+        {
+            Text = "该组件已临时停用，并由信息占位保留原位置。你可以展开详情或复制错误报告。",
+            Foreground = CreateBrush("#FFD6DEE9"),
+            TextWrapping = TextWrapping.Wrap
+        };
+
+        _statusBlock = new TextBlock
+        {
+            IsVisible = false,
+            Foreground = CreateBrush("#FF93C5FD"),
+            TextWrapping = TextWrapping.Wrap
+        };
+
+        _toggleDetailsButton = CreateButton("查看错误信息", OnToggleDetailsClick);
+        _copyReportButton = CreateButton("复制错误报告", OnCopyReportClick);
+
+        _reportTextBox = new TextBox
+        {
+            Text = _reportText,
+            IsReadOnly = true,
+            AcceptsReturn = true,
+            TextWrapping = TextWrapping.Wrap,
+            MinHeight = 96,
+            MaxHeight = 220,
+            Background = CreateBrush("#CC0F172A"),
+            Foreground = CreateBrush("#FFE2E8F0"),
+            BorderThickness = new Thickness(0),
+            Padding = new Thickness(8)
+        };
+
+        _detailsBorder = new Border
+        {
+            IsVisible = false,
+            Background = CreateBrush("#660F172A"),
+            BorderBrush = CreateBrush("#33475569"),
+            BorderThickness = new Thickness(1),
+            CornerRadius = new CornerRadius(12),
+            Child = _reportTextBox
+        };
+
+        _rootBorder = new Border
+        {
+            Background = CreateBrush("#D91E293B"),
+            BorderBrush = CreateBrush("#336B7280"),
+            BorderThickness = new Thickness(1),
+            CornerRadius = new CornerRadius(18),
+            Padding = new Thickness(14),
+            ClipToBounds = true,
+            Child = new StackPanel
+            {
+                Spacing = 8,
+                VerticalAlignment = VerticalAlignment.Center,
+                Children =
+                {
+                    _titleBlock,
+                    _summaryBlock,
+                    new WrapPanel
+                    {
+                        Orientation = Orientation.Horizontal,
+                        HorizontalAlignment = HorizontalAlignment.Left,
+                        ItemSpacing = 8,
+                        LineSpacing = 8,
+                        Children =
+                        {
+                            _toggleDetailsButton,
+                            _copyReportButton
+                        }
+                    },
+                    _statusBlock,
+                    _detailsBorder
+                }
+            }
+        };
+
+        Content = _rootBorder;
+        ApplyCellSize(48);
+    }
+
+    public void ApplyCellSize(double cellSize)
+    {
+        var normalized = Math.Max(1, cellSize);
+        _rootBorder.CornerRadius = new CornerRadius(Math.Clamp(normalized * 0.24, 12, 24));
+        _rootBorder.Padding = new Thickness(Math.Clamp(normalized * 0.24, 10, 18));
+        _titleBlock.FontSize = Math.Clamp(normalized * 0.36, 14, 22);
+        _summaryBlock.FontSize = Math.Clamp(normalized * 0.24, 11, 15);
+        _statusBlock.FontSize = Math.Clamp(normalized * 0.22, 10, 13);
+        _toggleDetailsButton.FontSize = Math.Clamp(normalized * 0.22, 10, 14);
+        _copyReportButton.FontSize = Math.Clamp(normalized * 0.22, 10, 14);
+        _toggleDetailsButton.Padding = new Thickness(Math.Clamp(normalized * 0.18, 8, 12), 6);
+        _copyReportButton.Padding = new Thickness(Math.Clamp(normalized * 0.18, 8, 12), 6);
+        _reportTextBox.FontSize = Math.Clamp(normalized * 0.2, 10, 13);
+        _reportTextBox.MaxHeight = Math.Clamp(normalized * 5.2, 120, 260);
+    }
+
+    private static Button CreateButton(string text, EventHandler<RoutedEventArgs> clickHandler)
+    {
+        var button = new Button
+        {
+            Content = text,
+            Background = CreateBrush("#80334155"),
+            Foreground = Brushes.White,
+            BorderBrush = CreateBrush("#335B6575"),
+            BorderThickness = new Thickness(1),
+            CornerRadius = new CornerRadius(999),
+            HorizontalAlignment = HorizontalAlignment.Left
+        };
+        button.Click += clickHandler;
+        return button;
+    }
+
+    private void OnToggleDetailsClick(object? sender, RoutedEventArgs e)
+    {
+        _detailsVisible = !_detailsVisible;
+        _detailsBorder.IsVisible = _detailsVisible;
+        _toggleDetailsButton.Content = _detailsVisible ? "隐藏错误信息" : "查看错误信息";
+        UpdateStatus(null);
+    }
+
+    private void OnCopyReportClick(object? sender, RoutedEventArgs e)
+    {
+        UiExceptionGuard.FireAndForgetGuarded(
+            CopyReportAsync,
+            "DesktopComponentFailureView.CopyReport",
+            UiExceptionGuard.BuildContext(
+                ("ComponentId", _componentId),
+                ("PlacementId", _placementId)));
+    }
+
+    private async Task CopyReportAsync()
+    {
+        var topLevel = TopLevel.GetTopLevel(this);
+        var clipboard = topLevel?.Clipboard;
+        if (clipboard is null)
+        {
+            UpdateStatus("当前环境不支持复制错误报告。");
+            return;
+        }
+
+        await clipboard.SetTextAsync(_reportText);
+        UpdateStatus("错误报告已复制到剪贴板。");
+    }
+
+    private void UpdateStatus(string? message)
+    {
+        _statusBlock.Text = message ?? string.Empty;
+        _statusBlock.IsVisible = !string.IsNullOrWhiteSpace(message);
+    }
+
+    private static string BuildReport(
+        string componentName,
+        string componentId,
+        string? placementId,
+        int? pageIndex,
+        string action,
+        Exception exception)
+    {
+        var version = Assembly.GetEntryAssembly()?.GetName().Version?.ToString() ?? "unknown";
+        var builder = new StringBuilder();
+        builder.AppendLine("LanMountainDesktop Component Failure Report");
+        builder.AppendLine($"GeneratedAt: {DateTimeOffset.Now:O}");
+        builder.AppendLine($"AppVersion: {version}");
+        builder.AppendLine($"Action: {action}");
+        builder.AppendLine($"ComponentName: {componentName}");
+        builder.AppendLine($"ComponentId: {componentId}");
+        builder.AppendLine($"PlacementId: {placementId ?? string.Empty}");
+        builder.AppendLine($"PageIndex: {pageIndex?.ToString() ?? string.Empty}");
+        builder.AppendLine($"ExceptionType: {exception.GetType().FullName}");
+        builder.AppendLine($"ExceptionMessage: {exception.Message}");
+        builder.AppendLine();
+        builder.AppendLine(exception.ToString());
+        return builder.ToString();
+    }
+
+    private static IBrush CreateBrush(string colorHex)
+    {
+        return new SolidColorBrush(Color.Parse(colorHex));
+    }
+}

LanMountainDesktop/Views/MainWindow.ComponentSystem.cs

@@ -1522,7 +1522,7 @@ public partial class MainWindow
             placement.PlacementId = Guid.NewGuid().ToString("N");
         }
 
-        var component = CreateDesktopComponentControl(placement.ComponentId, placement.PlacementId);
+        var component = CreateDesktopComponentControl(placement.ComponentId, placement.PlacementId, placement.PageIndex);
         if (component is null)
         {
             return null;
@@ -1956,23 +1956,54 @@ public partial class MainWindow
         return onLeft || onRight || onTop || onBottom;
     }
 
-    private Control? CreateDesktopComponentControl(string componentId, string? placementId = null)
+    private Control? CreateDesktopComponentControl(string componentId, string? placementId = null, int? pageIndex = null)
     {
         if (!_componentRuntimeRegistry.TryGetDescriptor(componentId, out var runtimeDescriptor))
         {
             return null;
         }
 
-        var component = runtimeDescriptor.CreateControl(
-            _currentDesktopCellSize,
-            _timeZoneService,
-            _weatherDataService,
-            _recommendationInfoService,
-            _calculatorDataService,
-            _componentSettingsService,
-            placementId);
-        component.Classes.Add(DesktopComponentClass);
-        return component;
+        return CreateDesktopComponentControl(runtimeDescriptor, _currentDesktopCellSize, placementId, pageIndex, "DesktopSurface");
+    }
+
+    private Control? CreateDesktopComponentControl(
+        DesktopComponentRuntimeDescriptor runtimeDescriptor,
+        double cellSize,
+        string? placementId,
+        int? pageIndex,
+        string action)
+    {
+        try
+        {
+            var component = runtimeDescriptor.CreateControl(
+                cellSize,
+                _timeZoneService,
+                _weatherDataService,
+                _recommendationInfoService,
+                _calculatorDataService,
+                _componentSettingsService,
+                placementId);
+            component.Classes.Add(DesktopComponentClass);
+            return component;
+        }
+        catch (Exception ex) when (!UiExceptionGuard.IsFatalException(ex))
+        {
+            AppLogger.Warn(
+                "ComponentRuntime",
+                $"Action={action}; ComponentId={runtimeDescriptor.Definition.Id}; PlacementId={placementId ?? string.Empty}; PageIndex={pageIndex?.ToString() ?? string.Empty}; ExceptionType={ex.GetType().FullName}; IsFatal=false",
+                ex);
+
+            var failureView = new DesktopComponentFailureView(
+                runtimeDescriptor.Definition.DisplayName,
+                runtimeDescriptor.Definition.Id,
+                placementId,
+                pageIndex,
+                action,
+                ex);
+            failureView.ApplyCellSize(cellSize);
+            failureView.Classes.Add(DesktopComponentClass);
+            return failureView;
+        }
     }
 
     private void CollapseComponentLibraryPanel()
@@ -3113,13 +3144,16 @@ public partial class MainWindow
             var previewHeight = previewSpan.HeightCells * previewCellSize;
             var renderCellSize = Math.Clamp(previewCellSize * 1.15, 26, 110);
 
-            var previewControl = descriptor.CreateControl(
+            var previewControl = CreateDesktopComponentControl(
+                descriptor,
                 renderCellSize,
-                _timeZoneService,
-                _weatherDataService,
-                _recommendationInfoService,
-                _calculatorDataService,
-                _componentSettingsService);
+                placementId: null,
+                pageIndex: null,
+                action: "ComponentLibraryPreview");
+            if (previewControl is null)
+            {
+                continue;
+            }
             // Component library previews must stay non-interactive so drag gesture is reliable.
             previewControl.IsHitTestVisible = false;
             previewControl.Focusable = false;

LanMountainDesktop/Views/MainWindow.SingleInstanceNotice.cs

@@ -1,59 +1,58 @@
-using System;
-using Avalonia.Interactivity;
+using System.Threading.Tasks;
 using Avalonia.Threading;
+using FluentAvalonia.UI.Controls;
+using LanMountainDesktop.Services;
 
 namespace LanMountainDesktop.Views;
 
 public partial class MainWindow
 {
-    private readonly DispatcherTimer _singleInstanceNoticeTimer = new()
-    {
-        Interval = TimeSpan.FromSeconds(6)
-    };
+    private bool _isSingleInstancePromptVisible;
 
     internal void ShowSingleInstanceNotice()
     {
+        void ShowPrompt()
+        {
+            UiExceptionGuard.FireAndForgetGuarded(
+                ShowSingleInstanceNoticeCoreAsync,
+                "MainWindow.ShowSingleInstanceNotice");
+        }
+
         if (Dispatcher.UIThread.CheckAccess())
         {
-            ShowSingleInstanceNoticeCore();
+            ShowPrompt();
             return;
         }
 
-        Dispatcher.UIThread.Post(ShowSingleInstanceNoticeCore, DispatcherPriority.Send);
+        Dispatcher.UIThread.Post(ShowPrompt, DispatcherPriority.Send);
     }
 
-    private void ShowSingleInstanceNoticeCore()
+    private async Task ShowSingleInstanceNoticeCoreAsync()
     {
-        SingleInstanceNoticeTitleTextBlock.Text = L(
-            "single_instance.notice.title",
-            "App already open");
-        SingleInstanceNoticeDescriptionTextBlock.Text = L(
-            "single_instance.notice.description",
-            "LanMountainDesktop is already running. Switched back to the active desktop.");
-        SingleInstanceNoticeButtonTextBlock.Text = L(
-            "single_instance.notice.button",
-            "Got it");
-        SingleInstanceNoticeDock.IsVisible = true;
+        if (_isSingleInstancePromptVisible)
+        {
+            return;
+        }
 
-        _singleInstanceNoticeTimer.Stop();
-        _singleInstanceNoticeTimer.Tick -= OnSingleInstanceNoticeTimerTick;
-        _singleInstanceNoticeTimer.Tick += OnSingleInstanceNoticeTimerTick;
-        _singleInstanceNoticeTimer.Start();
-    }
+        _isSingleInstancePromptVisible = true;
 
-    private void OnSingleInstanceNoticeButtonClick(object? sender, RoutedEventArgs e)
-    {
-        HideSingleInstanceNotice();
-    }
+        try
+        {
+            var dialog = new ContentDialog
+            {
+                Title = L("single_instance.notice.title", "应用已经运行"),
+                Content = L(
+                    "single_instance.notice.description",
+                    "应用已经运行，无需多次点击打开。"),
+                PrimaryButtonText = L("single_instance.notice.button", "确定"),
+                DefaultButton = ContentDialogButton.Primary
+            };
 
-    private void OnSingleInstanceNoticeTimerTick(object? sender, EventArgs e)
-    {
-        HideSingleInstanceNotice();
-    }
-
-    private void HideSingleInstanceNotice()
-    {
-        _singleInstanceNoticeTimer.Stop();
-        SingleInstanceNoticeDock.IsVisible = false;
+            await dialog.ShowAsync(this);
+        }
+        finally
+        {
+            _isSingleInstancePromptVisible = false;
+        }
     }
 }

LanMountainDesktop/Views/MainWindow.axaml

@@ -471,51 +471,6 @@
 
                         <StackPanel Grid.Row="1"
                                     Spacing="12">
-                            <Border x:Name="SingleInstanceNoticeDock"
-                                    IsVisible="False"
-                                    Classes="glass-panel"
-                                    CornerRadius="18"
-                                    Padding="14,12">
-                                <Grid ColumnDefinitions="Auto,*,Auto"
-                                      ColumnSpacing="12">
-                                    <Border Width="34"
-                                            Height="34"
-                                            CornerRadius="17"
-                                            Background="{DynamicResource AdaptiveAccentBrush}">
-                                        <fi:FluentIcon Icon="Alert"
-                                                       IconVariant="Regular"
-                                                       FontSize="16"
-                                                       Foreground="White"
-                                                       HorizontalAlignment="Center"
-                                                       VerticalAlignment="Center" />
-                                    </Border>
-                                    <StackPanel Grid.Column="1"
-                                                Spacing="2"
-                                                VerticalAlignment="Center">
-                                        <TextBlock x:Name="SingleInstanceNoticeTitleTextBlock"
-                                                   FontSize="13"
-                                                   FontWeight="SemiBold"
-                                                   Text="App already open" />
-                                        <TextBlock x:Name="SingleInstanceNoticeDescriptionTextBlock"
-                                                   TextWrapping="Wrap"
-                                                   Foreground="{DynamicResource AdaptiveTextSecondaryBrush}"
-                                                   Text="LanMountainDesktop is already running. Switched back to the active desktop." />
-                                    </StackPanel>
-                                    <Button x:Name="SingleInstanceNoticeButton"
-                                            Grid.Column="2"
-                                            Padding="14,8"
-                                            Click="OnSingleInstanceNoticeButtonClick">
-                                        <StackPanel Orientation="Horizontal" Spacing="8">
-                                            <fi:FluentIcon Icon="Checkmark"
-                                                           IconVariant="Regular" />
-                                            <TextBlock x:Name="SingleInstanceNoticeButtonTextBlock"
-                                                       VerticalAlignment="Center"
-                                                       Text="Got it" />
-                                        </StackPanel>
-                                    </Button>
-                                </Grid>
-                            </Border>
-
                             <Border x:Name="PendingRestartDock"
                                     IsVisible="False"
                                     Classes="glass-panel"