can not use direct2d in winui3?

Question

m_pRenderTarget->BeginDraw();
m_pRenderTarget->SetTransform(D2D1::Matrix3x2F::Identity());
m_pRenderTarget->Clear(D2D1::ColorF(D2D1::ColorF::DeepSkyBlue));
m_pRenderTarget->EndDraw();

in winform I can get the result.

but in winui3 nothing changed why?

Answer 1

See the sample I had posted : https://github.com/castorix/WinUI3_SwapChainPanel_Direct2D

The drawing is done in Render function, called in CompositionTarget_Rendering