.NET Framework 4.8 Not Supported for Some APIs

[khdc]

I have a WPF library project that multi-targets: net48, net6-windows, and net7-windows.

I noticed that APIs/types like HWND, WINDOW_STYLE, GetDeviceCaps, GetSystemMetrics, MonitorFromWindow, etc., show as not supported on net48.

Is there a reason why?

Should I switch back to the olden way of doing PInvoke?

[khdc]

The error occured when I removed this line from the csproj file as per the readme.md:

<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>

When I added it back in the error went away. I'm not sure why.

[AArnott]

These APIs are supported on net48. There must be something else going on in your project that is hiding HWND and the like.
Check out this trivial project:
CsWin32Sandbox.zip

It compiles its code that includes and uses HWND for both TFMs just fine:

Build started...
1>------ Build started: Project: CsWin32Sandbox, Configuration: Debug Any CPU ------
1>C:\Users\andarno\source\repos\CsWin32Sandbox\Program.cs(5,6,5,10): warning CS0219: The variable 'hWND' is assigned but its value is never used
1>CsWin32Sandbox -> C:\Users\andarno\source\repos\CsWin32Sandbox\bin\Debug\net472\CsWin32Sandbox.exe
1>Done building project "CsWin32Sandbox.csproj".
1>C:\Users\andarno\source\repos\CsWin32Sandbox\Program.cs(5,6,5,10): warning CS0219: The variable 'hWND' is assigned but its value is never used
1>CsWin32Sandbox -> C:\Users\andarno\source\repos\CsWin32Sandbox\bin\Debug\net7.0\CsWin32Sandbox.dll
1>Done building project "CsWin32Sandbox.csproj".
========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
========== Build started at 1:09 PM and took 00.362 seconds ==========

[khdc]

It's weird the problem went away when I added back the following to the csproj file. Maybe it was just a coincidence, or Visual Studio was having issues.

<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>