How to Publish AOT on Windows?

[klimatr26]

Hello.

I have been trying to publish a MAUI app as NativeAOT. I have created a new project on Visual Studio and have also used dotnet new maui. In both cases, dotnet publish -f net9.0-windows10.0.19041.0 -c Release produces an executable (and may other files) that takes a second to load but works. However, when I add <PublishAot>true</PublishAot> I get these messages (I am using .NET 9):

    C:\Users\User\.nuget\packages\microsoft.web.webview2\1.0.2792.45\lib_manual\net6.0-windows10.0.17763.0\Microsoft.Web.WebView2.Core.Projection.dll : warning IL2104: Assembly 'Microsoft.Web.WebView2.Core.Projection' produced trim warnings. For more information see https://aka.ms/il2104
    C:\Users\User\.nuget\packages\microsoft.web.webview2\1.0.2792.45\lib_manual\net6.0-windows10.0.17763.0\Microsoft.Web.WebView2.Core.Projection.dll : warning IL3053: Assembly 'Microsoft.Web.WebView2.Core.Projection' produced AOT analysis warnings.
    ILC : Trim analysis warning IL2026: WinRT.BaseActivationFactory._ActivateInstance<I>(): Using member 'WinRT.ComWrappersSupport.GetObjectReferenceForInterface<I>(IntPtr)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. This method is not trim-safe, and is only supported for use when not using trimming (or AOT).
    ILC : Trim analysis warning IL2026: WinRT.WinrtModule.GetActivationFactory(String): Using member 'WinRT.ComWrappersSupport.GetObjectReferenceForInterface<IActivationFactoryVftbl>(IntPtr)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. This method is not trim-safe, and is only supported for use when not using trimming (or AOT).
    ILC : Trim analysis warning IL2026: WinRT.DllModule.GetActivationFactory(String): Using member 'WinRT.ComWrappersSupport.GetObjectReferenceForInterface<IActivationFactoryVftbl>(IntPtr)' which has 'RequiresUnreferencedCodeAttribute' can break functionality when trimming application code. This method is not trim-safe, and is only supported for use when not using trimming (or AOT).

When I launch the executable, nothing seems to happen. Updating WebView2 seems to solve the first two issues, but not the other three. Event Viewer says that an Application Error occurred, on module Microsoft.UI.Xaml.dll, with exception code 0xc000027b.
The same thing has happened on my Windows 11 laptop and my Windows 10 desktop. Adding <WindowsSdkPackageVersion>10.0.19041.56</WindowsSdkPackageVersion> and <AllowUnsafeBlocks>true</AllowUnsafeBlocks> also makes no difference.

Edit: <PublishTrimmed>true</PublishTrimmed> also breaks the program.

What can I do?
Thank you.

[ganyl]

I'm getting the same error and I debug and find the problem.

[Piotr-Kniaz]

I encountered the same problem. May be issue with Windows App SDK? Has anyone already solved this issue?

Is NativeAOT fully supported in .NET MAUI for Windows?

[ganyl]

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