Telling if a .Net app is running as service or app?

Question

How do you tell if a .Net application is running as a Desktop application or running as a service?

We are trying to test our application with Fitnesse, which loads the app up as a service then makes calls into it.. but when a modal error box is pushed then it blows up.. I want to put a check to see if it is running in a service and if it is I want to throw an exception instead so our test will fail.

Is there a way to do this, other than passing a parameter to somewhere saying it was started by FitNesse?

Answer 1

I think this will work (no convenient place to test my air code):

// requires a 'using System.ServiceProcess' statement
type = Assembly.GetExecutingAssembly().EntryPoint.DeclaringType;
bool isRunningAsAService = type.IsSubclassOf(typeof(ServiceBase));

Answer 2

If you just want to determine whether or not to show a UI control, you can use:

if( Environment.UserInteractive )
{
    // Show UI
}