What are the if/then directives in C# for debugging and publishing?

There are different configurations in Visual Studio debug mode and release mode Build your .Net project.

Select Debug mode to step through your .Net project, then select Release mode in which the assembly file (.dll or .exe) is finally built.

To change the build configuration -

From the Build menu, select Configuration Manager and then select Debug or Release. Or On the toolbar, select Debug or Release from the solution configuration

#The code written in if debug will only be executed under the following circumstances: Run in debug mode.

If the code is running in release mode, #if Debug will be false and the code present within it will not be executed.

Example

class Program{
   static void Main(string[] args){
      #if DEBUG
         Console.WriteLine("Mode=Debug");
      #else
         Console.WriteLine("Mode=Release");
      #endif
         Console.ReadLine();
   }
}

Output

if in Debug Mode
Mode=Debug
if in Release Mode
Mode=Release

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