Installed WPF app not starting after upgrading Microsoft.Extensions.Hosting to 10.0.0

[JochemPalmsens]

Description

I've upgraded my WPF app with the latest released package versions (10.0.0). The app runs fine from Visual Studio. However, when generating an installer (with a vdproj file) and installing the app, the application doesn't start. I found the exception in the windows event viewer.

CoreCLR Version: 9.0.1125.51716
.NET Version: 9.0.11
Description: The process was terminated due to an unhandled exception.
Exception Info: System.Windows.Markup.XamlParseException: The method or operation is not implemented.
 ---> System.NotImplementedException: The method or operation is not implemented.
   at System.Windows.Baml2006.Baml2006SchemaContext.ResolveBamlType(BamlType bamlType, Int16 typeId)
   at System.Windows.Baml2006.Baml2006SchemaContext.GetXamlType(Int16 typeId)
   at System.Windows.Baml2006.Baml2006Reader.Process_ElementStart()
   at System.Windows.Baml2006.Baml2006Reader.Process_OneBamlRecord()
   at System.Windows.Baml2006.Baml2006Reader.Process_BamlRecords()
   at System.Windows.Baml2006.Baml2006Reader.Read()
   at System.Windows.Markup.WpfXamlLoader.TransformNodes(XamlReader xamlReader, XamlObjectWriter xamlWriter, Boolean onlyLoadOneNode, Boolean skipJournaledProperties, Boolean shouldPassLineNumberInfo, IXamlLineInfo xamlLineInfo, IXamlLineInfoConsumer xamlLineInfoConsumer, XamlContextStack`1 stack, IStyleConnector styleConnector)
   at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
   --- End of inner exception stack trace ---
   at System.Windows.Markup.XamlReader.RewrapException(Exception e, IXamlLineInfo lineInfo, Uri baseUri)
   at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)
   at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)
   at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)
   at System.Windows.Application.LoadComponent(Object component, Uri resourceLocator)
   at MyCompany.MyAppName.App.InitializeComponent() in C:\Code\clone1\MyCompany.MyAppName\App.xaml:line 1
   at MyCompany.MyAppName.App..ctor(CLIOptions cliOptions) in C:\Code\clone1\MyCompany.MyAppName\App.xaml.cs:line 23
   at MyCompany.MyAppName.Program.<>c.<Main>b__0_0(CLIOptions cliOptions) in C:\Code\clone1\MyCompany.MyAppName\Program.cs:line 27
   at CommandLine.ParserResultExtensions.WithParsed[T](ParserResult`1 result, Action`1 action)
   at MyCompany.MyAppName.Program.Main(String[] args) in C:\Code\clone1\MyCompany.MyAppName\Program.cs:line 16

I've pinpointed the package that causes this to be Microsoft.Extensions.Hosting. Version 9.0.11 works fine, but 10.0.0 breaks the app.
If I generate a single file with things like <PublishSingleFile>true</PublishSingleFile>, <SelfContained>false</SelfContained>, <RuntimeIdentifier>win-x64</RuntimeIdentifier>, and <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract> it seems to work again, but we rather not do that.

Reproduction Steps

If really required, I could probably make some app, but it would take me some time to make this.

Expected behavior

The installed application runs as it would from Visual Studio.

Actual behavior

The installed application crashes on startup

Regression?

It worked/ is working with Microsoft.Extensions.Hosting version 9.0.11

Known Workarounds

Generate a single file with things like <PublishSingleFile>true</PublishSingleFile>, <SelfContained>false</SelfContained>, <RuntimeIdentifier>win-x64</RuntimeIdentifier>, and <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>

Configuration

.net 9, going to 10.
Windows 11 Pro 10.0.22631 build 22631
x64

Other information

some native libraries are missing? Exception is unclear. Also weird that it's a XAML error, while it's the Hosting package that causes the issue.
The installation executable (msi) is a fair amount larger (15%) with 10.0.0 than with 9.0.11, so more=less?

[lindexi]

@JochemPalmsens Do you update the .NET sdk to .NET 10?

Could you update all your project code?

[lindexi]

Reference: DHR60/v2rayN#10

[maihcx]

Same problem happened to me but with System.Drawing.Common package. When i use package 9.0.11 this problem does not happen

[14/11/2025 11:27:51 AM] UnhandledException: System.IO.FileNotFoundException: Could not load file or assembly 'System.Drawing.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
File name: 'System.Drawing.Common, Version=10.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'
   at Wpf.Ui.Tray.Hicon.FromSource(ImageSource source)
   at Wpf.Ui.Tray.TrayManager.ReloadHicon(INotifyIcon notifyIcon)
   at Wpf.Ui.Tray.TrayManager.Register(INotifyIcon notifyIcon, HwndSource parentSource)
   at Wpf.Ui.Tray.TrayManager.Register(INotifyIcon notifyIcon)
   at Wpf.Ui.Tray.Internal.InternalNotifyIconManager.Register()
   at Wpf.Ui.Tray.Controls.NotifyIcon.Register()
   at Wpf.Ui.Tray.Controls.NotifyIcon.OnRender(DrawingContext drawingContext)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at System.Windows.Controls.Grid.ArrangeOverride(Size arrangeSize)
   at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at MS.Internal.Helper.ArrangeElementWithSingleChild(UIElement element, Size arrangeSize)
   at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at System.Windows.Controls.Decorator.ArrangeOverride(Size arrangeSize)
   at System.Windows.Documents.AdornerDecorator.ArrangeOverride(Size finalSize)
   at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at System.Windows.Controls.Border.ArrangeOverride(Size finalSize)
   at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at System.Windows.Window.ArrangeOverride(Size arrangeBounds)
   at System.Windows.FrameworkElement.ArrangeCore(Rect finalRect)
   at System.Windows.UIElement.Arrange(Rect finalRect)
   at System.Windows.Interop.HwndSource.SetLayoutSize()
   at System.Windows.Interop.HwndSource.set_RootVisualInternal(Visual value)
   at System.Windows.Window.SetRootVisualAndUpdateSTC()
   at System.Windows.Window.SetupInitialState(Double requestedTop, Double requestedLeft, Double requestedWidth, Double requestedHeight)
   at System.Windows.Window.CreateSourceWindow(Boolean duringShow)
   at System.Windows.Window.ShowHelper(Object booleanBox)
   at System.Windows.Window.Show()
   at TrackingRTF.Tray.App.OnStartup(Object sender, StartupEventArgs e)
   at System.Windows.Application.<.ctor>b__1_0(Object unused)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at MS.Internal.CulturePreservingExecutionContext.CallbackWrapper(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
--- End of stack trace from previous location ---
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state)
   at MS.Internal.CulturePreservingExecutionContext.Run(CulturePreservingExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority priority, Delegate method, Object arg)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at TrackingRTF.Tray.App.Main()

[maihcx]

My current solution is to add nuget package System.Drawing.Common version 10.0.0 to main project and make setting Generate Path Property = Yes

[JochemPalmsens]

@JochemPalmsens Do you update the .NET sdk to .NET 10?

Could you update all your project code?

No, I'm staying at .net 9 until all 3rd party nuget packages are .net 10 compatible.
But the NuGet package manager says that the 10.0.0 packages should be .net 9 compatible.

[lindexi]

@JochemPalmsens After I update to Visual Studio 2026, I can not repro your issue. All my test project code is in https://github.com/lindexi/lindexi_gd/tree/eebaf54540bad43c33938498cb18fba00a25f3a4/WPFDemo/GeregurlelallwaFalabarcealear

My dotnet version:

>dotnet --info
.NET SDK:
 Version:           10.0.100
 Commit:            b0f34d51fc
 Workload version:  10.0.100-manifests.355811b7
 MSBuild version:   18.0.2+b0f34d51f

My Visual Studio version: 18.0.0

My csproj code:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>WinExe</OutputType>
    <TargetFramework>net10.0-windows</TargetFramework>
    <Nullable>enable</Nullable>
    <ImplicitUsings>enable</ImplicitUsings>
    <UseWPF>true</UseWPF>

    <PublishSingleFile>true</PublishSingleFile>
    <SelfContained>false</SelfContained>
    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
    <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Hosting" Version="10.0.0" />
  </ItemGroup>

</Project>

My publish command line:

dotnet publish

@JochemPalmsens Could you upload all your project code here?

[JochemPalmsens]

@lindexi if I do so I get fired and probably sued by my company 😅 I don't want to end-up on the street or in jail. So no.

If it's REALLY required, I could make an abstraction. However, I hope some MS dev working on this will say "ah, yes, of course this doesn't work due to [some breaking change where a dependency is no longer automatically added when generating the installer using a .vdproj], you should do [solution]". Or "we will fix this in 10.0.1".

[lindexi]

@JochemPalmsens Oh, so sorry to hear that. But could you remove all the business code, and trim it to the mini repro project code to upload?

[JochemPalmsens]

Ok, it too me one hour, but I managed to create a minimal working example:
https://github.com/JochemPalmsens/InstalledAppNotStarting

Steps:

• set target to Release
• Build app project
• Publish app project
• Build Setup project
• Install output
• Run installed application -> unhandled exception/crash.

Then doiwngrade Microsoft.Extensions.Hosting to Version="9.0.11"

• uninstall app
• rebuild app
• publish again
• rebuild setup project
• install downgraded version
• Run app -> no exception and window shown.

[lindexi]

@JochemPalmsens Can I know your publish project command?

My publish command is:

dotnet publish -r win-x64 --sc

or

dotnet publish -r win-x64

or

dotnet publish -r win-x64 --sc /p:PublishSingleFile=true

---

And, after "Publish app project", can you run the output file successfully? Because I do not think the Setup is necessary steps.