Hi, Target : move maui app from .net 8 to .net 9 in Mac. Documentation : https://learn.microsoft.com/en-us/dotnet/maui/whats-new/dotnet-9?view=net-maui-9.0#upgrade-from-net-8-to-net-9 Problem :App not working without debugging. Steps : I did all steps in documentation. Update Nuget packages. My final Nuget packages in cs proj is: <ItemGroup> <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" /> <PackageReference Include="CommunityToolkit.Maui" Version="9.0.0" /> <PackageReference Include="System.Management" Version="9.0.1" /> <PackageReference Include="Telerik.UI.for.Maui" Version="9.0.0" /> <PackageReference Include="Microsoft.Extensions.Logging.Log4Net.AspNetCore" Version="8.0.0" /> <PackageReference Include="Autofac" Version="8.2.0" /> <PackageReference Include="DotNetZip" Version="1.16.0" /> </ItemGroup>  <ItemGroup Condition="$(TargetFramework.Contains('-windows')) == true"> <PackageReference Include="WindowsAPICodePack" Version="8.0.6" /> </ItemGroup> Still problem exist , why ? In debug that it working I got this error: Exception has occurred: CLR/System.InvalidOperationException An unhandled exception of type 'System.InvalidOperationException' occurred in Microsoft.MacCatalyst.dll: 'Window was already destroyed' at UIKit.UIApplication.xamarin_UIApplicationMain(Int32 argc, IntPtr argv, IntPtr principalClassName, IntPtr delegateClassName, IntPtr* gchandle) at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName) at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass) at GoodDesktopClient.Maui.Program.Main(String[] args) in

I would suspect it is something in the AppDelegate that is causing the error. in your project file you might set <IsAotCompatible>true</IsAotCompatible> this will enable aot in the debug build, and may help. note: I can build and run a MacCatalyst app from the comandline, but not from vscode debug (AOT error). probably need a workload update. this complexity is why I use Xcode/SwiftUI for production applications.

Transition from 8 to 9 in maui not worked

Dani_S 4,071

Hi,

Target: move maui app from .net 8 to .net 9 in Mac.

Documentation:

https://learn.microsoft.com/en-us/dotnet/maui/whats-new/dotnet-9?view=net-maui-9.0#upgrade-from-net-8-to-net-9

Problem:App not working without debugging.

Steps:

I did all steps in documentation.
Update Nuget packages.
My final Nuget packages in cs proj is:
<ItemGroup> <PackageReference Include="Microsoft.Maui.Controls" Version="$(MauiVersion)" /> <PackageReference Include="CommunityToolkit.Maui" Version="9.0.0" /> <PackageReference Include="System.Management" Version="9.0.1" /> <PackageReference Include="Telerik.UI.for.Maui" Version="9.0.0" /> <PackageReference Include="Microsoft.Extensions.Logging.Log4Net.AspNetCore" Version="8.0.0" /> <PackageReference Include="Autofac" Version="8.2.0" /> <PackageReference Include="DotNetZip" Version="1.16.0" /> </ItemGroup>  <ItemGroup Condition="$(TargetFramework.Contains('-windows')) == true"> <PackageReference Include="WindowsAPICodePack" Version="8.0.6" /> </ItemGroup>
Still problem exist , why ?

In debug that it working I got this error:

Exception has occurred: CLR/System.InvalidOperationException
An unhandled exception of type 'System.InvalidOperationException' occurred in Microsoft.MacCatalyst.dll: 'Window was already destroyed'
at UIKit.UIApplication.xamarin_UIApplicationMain(Int32 argc, IntPtr argv, IntPtr principalClassName, IntPtr delegateClassName, IntPtr* gchandle)
at UIKit.UIApplication.UIApplicationMain(Int32 argc, String[] argv, IntPtr principalClassName, IntPtr delegateClassName)
at UIKit.UIApplication.Main(String[] args, Type principalClass, Type delegateClass)
at GoodDesktopClient.Maui.Program.Main(String[] args) in

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Leon Lu (Shanghai Wicresoft Co,.Ltd.) 79,471 Reputation points Microsoft Vendor

2025-02-06T02:37:49.5066667+00:00

Please do not post error with an image, it is inaccessible, you can paste the error in this forum directly, I moved your additional information from comment to your question.
Dani_S 4,071 Reputation points

2025-02-06T04:46:09.09+00:00
OK

I added this tag to csproj without help.

please look on these files are they OK:

1.SceneDelegate

namespace GssdDesktopClient.Maui;

using Foundation;

using Microsoft.Maui;

using UIKit;

[Register("SceneDelegate")]

public class SceneDelegate : MauiUISceneDelegate

{

}

my info.plist file in

<?``xml version="1.0" encoding="UTF-8"?>

<!``DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

<``plist version="1.0">

<``dict>

<``key>UIDeviceFamily</key>

<``array>

<``integer>1</integer>

<``integer>2</integer>

</``array>

<``key>UIRequiredDeviceCapabilities</key>

<``array>

<``string>arm64</string>

</``array>

<``key>UISupportedInterfaceOrientations</key>

<``array>

<``string>UIInterfaceOrientationPortrait</string>

<``string>UIInterfaceOrientationLandscapeLeft</string>

<``string>UIInterfaceOrientationLandscapeRight</string>

</``array>

<``key>UISupportedInterfaceOrientations~ipad</key>

<``array>

<``string>UIInterfaceOrientationPortrait</string>

<``string>UIInterfaceOrientationPortraitUpsideDown</string>

<``string>UIInterfaceOrientationLandscapeLeft</string>

<``string>UIInterfaceOrientationLandscapeRight</string>

</``array>

<``key>XSAppIconAssets</key>

<``string>Assets.xcassets/appicon.appiconset</string>

<``key>UIApplicationSceneManifest</key>

<``dict>

<``key>UIApplicationSupportsMultipleScenes</key>

<``true/>

<``key>UISceneConfigurations</key>

<``dict>

<``key>UIWindowSceneSessionRoleApplication</key>

<``array>

<``dict>

<``key>UISceneConfigurationName</key>

<``string>__MAUI_DEFAULT_SCENE_CONFIGURATION__</string>

<``key>UISceneDelegateClassName</key>

<``string>SceneDelegate</string>

</``dict>

</``array>

</``dict>

</``dict>

</``dict>

</``plist>
Dani_S 4,071 Reputation points

2025-02-06T05:25:15.6366667+00:00

Here is link to the project:

https://limewire.com/d/982d9bbd-096c-4516-8a03-1856efce11d4#uP_ykA14PCAWrb8YIdFnV_wII7hR76mL0bJSI-p7jc8

1 answer

Bruce (SqlWork.com) 70,776 Reputation points

2025-02-05T23:45:18.8933333+00:00

I would suspect it is something in the AppDelegate that is causing the error. in your project file you might set

<IsAotCompatible>true</IsAotCompatible>

this will enable aot in the debug build, and may help.

note: I can build and run a MacCatalyst app from the comandline, but not from vscode debug (AOT error). probably need a workload update.

this complexity is why I use Xcode/SwiftUI for production applications.
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Transition from 8 to 9 in maui not worked

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