Antialiased back buffer error with DirectX 9 and WPF

Question

I'm trying to use anti aliasing in WPF and DirectX 9.
I'm using the function:

d3dImage.SetBackBuffer(D3DResourceType.IDirect3DSurface9, m_ViewportRenderSurface);

but I got this error:

Exception thrown: 'System.ArgumentException' in PresentationCore.dll
Additional information: An antialiased back buffer requires a IDirect3DDevice9Ex device.

When using DirectX 9ex everything works as expected.
Any idea how to make it work with DirectX 9?

thanks

Answer 1

You can't do that. See note about multi sampling at https://msdn.microsoft.com/en-us/library/hh140978(v=vs.110).aspx