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Asked: 2026-05-19T00:59:51+00:00

I am using C#. Need to know about the usage of #if. The code

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I am using C#. Need to know about the usage of #if.
The code details is:

#if
    //logic code
#else
    //logic code
#endif
    //logic code

I cant understand how its working in debugging mode.
Waiting for quick response. Thanks in advance.

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1 Answer

  1. Editorial Team

    “#if DEBUG” works because Visual Studio creates a Pre-processor directive with the name DEBUG based on current Solution’s configuration(either in Release Mode or Debug Mode) – Solution configuration have option to enable/disable DEBUG and TRACE constants and to associate them with solution configurations.

    You can use this directive anywhere in code and it help eliminating code based on mode at build time. and this is really a common scenario where some times we need a code to run only in debug mode but not in release mode. more details you can find here

    http://dotnetfacts.blogspot.com/2009/05/determine-debug-mode-in-net.html

    Regards,

    Edit: Thanks to Paul Alexander for clarification

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