#if (DEBUG) VS System.Diagnostics.Debugger.IsAttached

Question

What is different between using #if (DEBUG) and System.Diagnostics.Debugger.IsAttached in visual studio? Are there cases of the DEBUG

Answer 1

#if DEBUG is a compile-time check, meaning the code it surrounds will only be included in the output assembly if the DEBUG preprocessor symbol is defined. Debugger.IsAttached is a runtime check, so the debugging code still gets included in the assembly, but only executes if a debugger is attached to the process.