Pre-Processor directives in C#

问题

I seem to be having trouble with preprocessor directives in C#. I've created a Visual Studio 2008 C# win forms app. I add this:

#if (DEBUG)
            textBox1.Text = "in debug mode";
#else
            textBox1.Text = "in release mode";
#endif

And when I run in debug I see the expected "in debug mode". However when I switch to Release, compile, and run the .exe, I still see the "in debug mode" text. In my project properties I have Define DEBUG constant checked. I even get the correct color-coded syntax for the code above. What gives?

回答1:

Any chance you have DEBUG defined for both Debug and Release configurations?

回答2:

Do you have a "#define DEBUG" line ? That sets DEBUG to true always.

来源：https://stackoverflow.com/questions/637061/pre-processor-directives-in-c-sharp