MarkupExtension Class is in System.Xaml.dll
and locates in System.Windows.Markup
Namespace. MarkupExtension applies to below products:
In my device, System.Xaml.dll
is in C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0\ref\net5.0
. If I misunderstand your question, please point out.
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