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OutGridTree.Window/App.axaml.cs
using Avalonia; using Avalonia.Controls.ApplicationLifetimes; using Avalonia.Markup.Xaml; namespace OutGridTree.Window; internal sealed partial class App : Application { public override void Initialize() { AvaloniaXamlLoader.Load(this); } public override void OnFrameworkInitializationCompleted() { if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop) { desktop.MainWindow = new MainWindow(); } base.OnFrameworkInitializationCompleted(); } }