WinForms - WebView2 App Crash when targeting .NET5 ARM64 due to System.Windows.Rect

[snickler]

Application: WindowsFormsApp2.exe
CoreCLR Version: 5.0.20.27907
.NET Version: 5.0.0-preview.6.20279.7
Description: The process was terminated due to an unhandled exception.
Exception Info: System.TypeLoadException: Could not load type 'System.Windows.Rect' from assembly 'WindowsBase, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.
   at Microsoft.Web.WebView2.WinForms.WebView2.InitCoreWebView2Async(CoreWebView2Environment environment)
   at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine)
   at Microsoft.Web.WebView2.WinForms.WebView2.InitCoreWebView2Async(CoreWebView2Environment environment)
   at Microsoft.Web.WebView2.WinForms.WebView2.EnsureCoreWebView2Async(CoreWebView2Environment environment)
   at Microsoft.Web.WebView2.WinForms.WebView2.set_Source(Uri value)
   at WindowsFormsApp2.Form1.InitializeComponent() in C:\Users\jerem\Downloads\WindowsFormsApp2\WindowsFormsApp2\Form1.Designer.cs:line 49
   at WindowsFormsApp2.Form1..ctor() in C:\Users\jerem\Downloads\WindowsFormsApp2\WindowsFormsApp2\Form1.cs:line 19
   at WindowsFormsApp2.Program.Main() in C:\Users\jerem\Downloads\WindowsFormsApp2\WindowsFormsApp2\Program.cs:line 20

When instantiating a new instance of Microsoft.Web.WebView2.WinFoms.WebView2 in a WinForms project on ARM64, setting the Size or Source properties will result in a crash due to the usage of System.Windows.Rect. Digging into the decompilation of the WinForms WebView2 DLL, the culprit is the CoreWebView2Controller.Bounds property. As WPF support support isn't ready for ARM64 in the .NET 5, it seems that relying on a WPF type for use in a WinForms project presents an issue.

Is there any way that the Bounds property can be abstracted from explicitly being tied to Rect?

Thanks!

[pagoe-msft]

@snickler thanks for raising this issue, I've filed a bug in our backlog.

[RussKie]

Windows Forms stack shouldn't use WPF primitives, instead use primitives provided by System.Drawing, e.g. https://docs.microsoft.com/en-us/dotnet/api/system.drawing.rectangle?view=netcore-3.1

[oggy22]

@RussKie that is correct. This is actually our wrapper DLL used both by wpf and winforms. We will switch to

[oggy22]

.... System.Drawing

[champnic]

This has been resolved and should be available in our next SDK release :)

[champnic]

The fix is now available in the latest prerelease package, 0.9.628-prerelease. Thanks!