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Asked: 2026-05-14T22:15:00+00:00

What is the usage of #if DEBUG pre-processor directive in C#? When must we

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What is the usage of #if DEBUG pre-processor directive in C#? When must we use this?

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  1. Editorial Team

    In Debug mode:

    #if DEBUG
            System.Console.WriteLine("Debug version");
#endif
            System.Console.WriteLine("Output");

    Output as

    Debug version
Output

    In Release mode:

    #if DEBUG
            System.Console.WriteLine("Debug version");
#endif
            System.Console.WriteLine("Output");

    Output as

       Output

    read this: #if (C# Reference)

    Usage: If you have a set of values to be tested in the debug mode and not in the release mode you can use #if DEBUG

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