fix build.

src/Avalonia.Controls/ApiCompatBaseline.txt

@@ -36,6 +36,7 @@ CannotRemoveBaseTypeOrInterface : Type 'Avalonia.Controls.WindowBase' does not i
 InterfacesShouldHaveSameMembers : Interface member 'public System.EventHandler<Avalonia.Controls.ApplicationLifetimes.ShutdownRequestedEventArgs> Avalonia.Controls.ApplicationLifetimes.IClassicDesktopStyleApplicationLifetime.ShutdownRequested' is present in the implementation but not in the contract.
 InterfacesShouldHaveSameMembers : Interface member 'public void Avalonia.Controls.ApplicationLifetimes.IClassicDesktopStyleApplicationLifetime.add_ShutdownRequested(System.EventHandler<Avalonia.Controls.ApplicationLifetimes.ShutdownRequestedEventArgs>)' is present in the implementation but not in the contract.
 InterfacesShouldHaveSameMembers : Interface member 'public void Avalonia.Controls.ApplicationLifetimes.IClassicDesktopStyleApplicationLifetime.remove_ShutdownRequested(System.EventHandler<Avalonia.Controls.ApplicationLifetimes.ShutdownRequestedEventArgs>)' is present in the implementation but not in the contract.
+InterfacesShouldHaveSameMembers : Interface member 'public System.Boolean Avalonia.Controls.ApplicationLifetimes.IClassicDesktopStyleApplicationLifetime.TryShutdown(System.Int32)' is present in the implementation but not in the contract.
 CannotRemoveBaseTypeOrInterface : Type 'Avalonia.Controls.Embedding.EmbeddableControlRoot' does not implement interface 'Avalonia.Utilities.IWeakSubscriber<Avalonia.Controls.ResourcesChangedEventArgs>' in the implementation but it does in the contract.
 MembersMustExist : Member 'public System.Action<Avalonia.Size> Avalonia.Controls.Embedding.Offscreen.OffscreenTopLevelImplBase.Resized.get()' does not exist in the implementation but it does exist in the contract.
 MembersMustExist : Member 'public void Avalonia.Controls.Embedding.Offscreen.OffscreenTopLevelImplBase.Resized.set(System.Action<Avalonia.Size>)' does not exist in the implementation but it does exist in the contract.
@@ -62,4 +63,4 @@ InterfacesShouldHaveSameMembers : Interface member 'public void Avalonia.Platfor
 MembersMustExist : Member 'public void Avalonia.Platform.IWindowImpl.Resize(Avalonia.Size)' does not exist in the implementation but it does exist in the contract.
 InterfacesShouldHaveSameMembers : Interface member 'public void Avalonia.Platform.IWindowImpl.Resize(Avalonia.Size, Avalonia.Platform.PlatformResizeReason)' is present in the implementation but not in the contract.
 InterfacesShouldHaveSameMembers : Interface member 'public Avalonia.Platform.ITrayIconImpl Avalonia.Platform.IWindowingPlatform.CreateTrayIcon()' is present in the implementation but not in the contract.
-Total Issues: 63
+Total Issues: 64

src/Avalonia.Controls/ApplicationLifetimes/ClassicDesktopStyleApplicationLifetime.cs

@@ -99,7 +99,10 @@ namespace Avalonia.Controls.ApplicationLifetimes
             
             if(options != null && options.ProcessUrlActivationCommandLine && args.Length > 0)
             {
-                ((IApplicationPlatformEvents)Application.Current).RaiseUrlsOpened(args);
+                if (Application.Current is IApplicationPlatformEvents events)
+                {
+                    events.RaiseUrlsOpened(args);
+                }
             }
 
             var lifetimeEvents = AvaloniaLocator.Current.GetService<IPlatformLifetimeEventsImpl>(); 
@@ -133,14 +136,17 @@ namespace Avalonia.Controls.ApplicationLifetimes
 
         private bool DoShutdown(ShutdownRequestedEventArgs e, bool force = false, int exitCode = 0)
         {
-            ShutdownRequested?.Invoke(this, e);
+            if (!force)
+            {
+                ShutdownRequested?.Invoke(this, e);
+
+                if (e.Cancel)
+                    return false;
 
-            if (e.Cancel)
-                false;
+                if (_isShuttingDown)
+                    throw new InvalidOperationException("Application is already shutting down.");
+            }
 
-            if (_isShuttingDown)
-                throw new InvalidOperationException("Application is already shutting down.");
-            
             _exitCode = exitCode;
             _isShuttingDown = true;
 
@@ -157,15 +163,15 @@ namespace Avalonia.Controls.ApplicationLifetimes
                     }
                 }
 
-                if (Windows.Count > 0)
+                if (!force && Windows.Count > 0)
                 {
                     e.Cancel = true;
                     return false;
                 }
 
-                var e = new ControlledApplicationLifetimeExitEventArgs(exitCode);
-                Exit?.Invoke(this, e);
-                _exitCode = e.ApplicationExitCode;                
+                var args = new ControlledApplicationLifetimeExitEventArgs(exitCode);
+                Exit?.Invoke(this, args);
+                _exitCode = args.ApplicationExitCode;                
             }
             finally
             {

src/Avalonia.Native/AvaloniaNativeMenuExporter.cs

@@ -137,9 +137,9 @@ namespace Avalonia.Native
                 {
                     lifetime.TryShutdown();
                 }
-                else
+                else if(Application.Current is {ApplicationLifetime: IControlledApplicationLifetime controlledLifetime})
                 {
-                    lifetime.Shutdown();
+                    controlledLifetime.Shutdown();
                 }
             };