When will hobby OS developers realize that we don't need to implement everything from scratch? With a clean environment providing basic network, graphics, filesystem, and USB support, there's no need to build it yourself—just load a DXE driver and go ahead with your 'OS'.
Publishing uses the repository-local qemu-img to create ConsoleApp1.vhd, then starts the repository-local QEMU x64 emulator. QEMU, its Windows runtime dependencies, and the EDK2 UEFI firmware are included in qemu; no QEMU or VMware installation and no administrator privileges are required.
Use dotnet publish --tl:off -c Release ConsoleApp1 to publish and run with live build output. Pass -p:RunQemu=false to publish without starting QEMU.
Format a USB drive as FAT32 and copy the contents of Drive to its root. To use UEFI network support on real hardware, enable it in the firmware settings.
After publishing, CopyEFI updates Drive/EFI/BOOT/BOOTX64.efi, CreateVHD converts that directory into a dynamic VHD without mounting it, and RunQemu boots the VHD with the bundled EDK2 firmware. Pass -p:RunQemu=false to create the VHD without starting the emulator, or also pass -p:CreateVHD=false to skip VHD creation.
The SDL window uses QEMU's default Left Ctrl+Left Alt+G shortcut to release mouse and keyboard input. On Windows, select the English input method for the QEMU window because an active IME can intercept this shortcut.