Cannot create SKElement when using SkiaSharp.Views.WPF in Uno on Linux and Net 7.0

[HowardPWeiss]

I am trying to use SkiaSharp in a WPF project for Linux

I am using .Net 7, VisualStudioCode, Ubuntu 20.04

I have installed SkiaSharp.Views.WPF version 2.88.3. My MainPage,xaml looks like

<Grid>
  <skia:SKElement PaintSurface="OnPaintSurface" IgnorePixelScaling="True" />
</Grid>

When I run dotnet build, i see the following

CSC : error UXAML0001: Unable to resolve System.Windows.FrameworkElement (Reason: None, Location:Unknown, Candidates: ) [/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MyUnoApp.csproj::TargetFramework=net7.0]
/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MainPage (copy).xaml(12,6): error UXAML0001: An error was found in Grid [/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MyUnoApp.csproj::TargetFramework=net7.0]
/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MainPage (copy).xaml(1,2): error UXAML0001: An error was found in Page [/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MyUnoApp.csproj::TargetFramework=net7.0]
CSC : error UXAML0001: Processing failed for file /home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MainPage (copy).xaml (Uno.UI.SourceGenerators.XamlGenerator.XamlParsingException: An error was found in Page [/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MyUnoApp.csproj::TargetFramework=net7.0]
CSC : error UXAML0001: Unable to resolve System.Windows.FrameworkElement (Reason: None, Location:Unknown, Candidates: ) [/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MyUnoApp.csproj::TargetFramework=net7.0]
/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MainPage.xaml(12,6): error UXAML0001: An error was found in Grid [/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MyUnoApp.csproj::TargetFramework=net7.0]
/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MainPage.xaml(1,2): error UXAML0001: An error was found in Page [/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MyUnoApp.csproj::TargetFramework=net7.0]
CSC : error UXAML0001: Processing failed for file /home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MainPage.xaml (Uno.UI.SourceGenerators.XamlGenerator.XamlParsingException: An error was found in Page [/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MyUnoApp.csproj::TargetFramework=net7.0]
/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MainPage.xaml.cs(27,18): error CS1061: 'MainPage' does not contain a definition for 'InitializeComponent' and no accessible extension method 'InitializeComponent' accepting a first argument of type 'MainPage' could be found (are you missing a using directive or an assembly reference?) [/home/howard/Desktop/SKElementProblem_B/MyUnoApp/MyUnoApp/MyUnoApp.csproj::TargetFramework=net7.0]

SKElement is defined as follows:

public class SKElement : System.Windows.FrameworkElement

However, System,WIndows.FrameWorkElement is not included in Net 7.0. Hence, the first error message "Unable to resolve System.Windows.FrameworkElement"

How do I fix this?

Howard Weiss

[jeromelaban]

Thanks for the report.

It seems that you're trying to use SkiaSharp in your application, and you should be taking a look at https://github.com/unoplatform/Uno.Samples/tree/master/UI/SkiaSharpTest. In an Uno Platform XAML tree, you need to use Uno Platform compatible controls, such as SKXamlCanvas.

[HowardPWeiss]

The sample works. Thank you I was using SkiaSharp.Views.WPF rather than SkiaSharp.Views.Windows. From what I found on the Internet, I thought I needed to use SkiaSharp.Views.WPF and create an SKElement in Uno running on Linux and built using Visual Studio Core. I still need to modify my application and see if that builds and works, etc. Howard

…

On 04/24/2023 8:28 AM Jérôme Laban ***@***.***> wrote: Thanks for the report. It seems that you're trying to use SkiaSharp in your application, and you should be taking a look at https://github.com/unoplatform/Uno.Samples/tree/master/UI/SkiaSharpTest. In an Uno Platform XAML tree, you need to use Uno Platform compatible controls, such as SKXamlCanvas. — Reply to this email directly, view it on GitHub #12039 (comment) , or unsubscribe https://github.com/notifications/unsubscribe-auth/AVW7USLVCBYOEUMRPX5YGV3XCZWXJANCNFSM6AAAAAAXIF7DXY . You are receiving this because you authored the thread.Message ID: ***@***.***>