Why Does My C# Code Show Debug Mode Even When the Build Configuration is Release?

Visual Studio Debugging and Release Mode Control

In Visual Studio, developers often need to configure their code's behavior differently depending on whether it's running in debug or release mode. Here's a common question that arises:

Problem:
In my C# solution, I've set the Configuration to "release," but my code shows that I'm running in "debug" mode. What am I doing wrong?

Answer:

The issue here lies in customized preprocessor symbols. While you have defined DEBUG and RELEASE as preprocessor symbols in your code, Visual Studio already defines DEBUG or _DEBUG based on the build configuration. To access the correct build configuration, you should use the predefined symbols instead of manually defining them.

Solution:

1. Remove the custom preprocessor definition #define DEBUG from your code.
2. In Visual Studio, go to the "Build" menu and select "Configuration Manager."
3. Under the "Active solution configuration" and "Active solution platform" dropdown menus, select "Release" and "Any CPU" respectively.
4. Check the "Define Debug Constant" option under "Conditional compilation symbols."

Correct Code:

#if DEBUG
    Console.WriteLine("Mode=Debug"); 
#else
    Console.WriteLine("Mode=Release"); 
#endif

In this corrected code, we check the predefined DEBUG symbol rather than the custom RELEASE symbol. This will ensure that the code behaves correctly in both debug and release modes.

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