Determine if GAC'ed & NGen'ed assemblies are being used

Question

How do I determine if the Native images are being used without the Loader verifing the signature of the assembly at runtime, or even using the GAC\'ed assembly?

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Answer 1

You can easily see it from the Fuslogvw.exe tool. Start it from the Visual Studio Command Prompt. Configure it with Log Categories = Native Images, Settings + Log all binds to disk. Run your program. Back to fuslogvw, Refresh. It will show you a list of all assemblies that got loaded.

Double-click an entry to see how the assembly got loaded. If it came from the GAC, you'll see:

LOG: IL assembly loaded from C:\Windows\assembly\GAC_MSIL\blahblah

If the Ngen-ed images was used, you'll see:

LOG: Bind to native image succeeded.