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问题:

Basically, the question in the title - how can I / is it possible to determine that Cassini is what's running my app versus IIS? Basically I want my code to know that it's debugging, so if I'm missing something easier here, please point it out.

回答1:

return AppDomain.CurrentDomain
    .GetAssemblies()
    .Any(
        a => a.FullName.StartsWith("WebDev.WebHost")
    );

回答2:

You can look at the port. Casini always runs on a random high port. IIS will usually be 80 or 443 unless you've configured it differently.

回答3:

If your goal is solely to determine whether you are debugging (in which case the build configuration will probably be debug), you can use something like:

#if DEBUG
    // Code compiled only if debug configuration selected (not release)
#endif

More info here

回答4:

The following suggest that your app is running under casini:

When you run your app, if your URL in the browser has a port mentioned in it (generally a high number - greater than 1000)
You can check your project properties (Web tab) to check if it is running under IIS or Web Development server (casini)
There will be a process running for casini server WebServer40.exe

回答5:

If I am understanding you correctly, you want to determine if you are in debug mode or not and perhaps apply some debugging logic?

In the past, I have accomplished what you are attempting to achieve using a key that I added in the web.config. When I am developing and debugging, I set the variable RunningFromVisualStudio=true and when I promote to production, I set it the variable to false.

Hope that helps.