问题
I'm sure I have done this before in the past, but I've been in the docs for a bit, and can't seem to find it again. I need to be able to determine at run time in my business domain what context my application is running in. So that I may do some switching with config files, and use the proper method to determine if I am running in debug or release etc. I was pretty confident it was in System.Environment, but I have not come across it yet.
回答1:
Very easy method:
bool isWebApp = HttpContext.Current != null;
Works like a charm every time.
回答2:
I found the way I had done it earlier finally.
bool isWebApp = System.Web.HttpRuntime.AppDomainId != null;
It's much the same as Nathan's response though. Thanks for the reply.
来源：https://stackoverflow.com/questions/820595/net-determine-at-run-time-whether-my-app-is-an-exe-or-a-web-app