Can reproduce this and will fix it after my vacation.
Thanks for reporting.

So, after some investigation this is not caused by self-contained, but by single-file combined with self-contained instead.

I will need some more time to find a solution for this as the dlls required to inject Snoop are not loaded as modules.

I tried and investigated a lot, but it seems impossible, as of now, to attach to a single file self-contained app.
Even Visual Studio, at least on my machine, can't debug such an app.

I won't give up. But for now, will set my priorities on other problems till i might have a bright moment on how to solve this issue.

@batzen I did encounter some issues with singlefilehost and attaching to release with PDB files ... etc
It is working in 17.4.0 Preview 4.0 ... Maybe you could check it out?

More info:

dotnet/runtime#76601

Hey,

I just tested it while trying to leave a response here:

VS debugger break

It works :O.
Can you check on your side? I am wondering if this is a Windows/.NET security fix that carried it over or what.
My colleague also checked it on his laptop which suffered the same problem and as of now its gone.

If it works we could close this issue.

UPDATE:
Yeah so probably I got some dll copy pasted over or something.
Re-compiled and double checked. Snoop still cannot inject and "debug".

Issue still valid.

NGen is for .NET Framework (.NET 4.5 etc.) and not for .NET (Core).
That's totally unrelated to this issue ;-)

Single-file self-contained does not mean native.
AOT would be native.
But as WPF is not AOT friendly I never tried Snoop for that case. But I guess Snoop won't work for AOT compiled apps.

Based on dotnet/wpf#8488 WPF should be trimmable now. I've read that they also implemented native AOT for WPF with .NET 8, if I recall correctly. But can't find the issue on GItHub right now.