Pls try the below link:
https://docs.microsoft.com/en-us/windows/winui/api/microsoft.ui.xaml.controls.captureelement
Equivalent WinUI class: Microsoft.UI.Xaml.Controls.CaptureElement.
404 - Page not found
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WinUI 3 Project Reunion 0.5 (March 2021) - WinUI
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What the hell are you fucking doing ?