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Debug.Writeline is Not printing anything

VS 2010 Pro, C#, WinForms: at the very beginning of my method I am saying Debug.Writeline("entering method blah"); then somewhere inside this method I am putting some breakpoints and ru开发者_开发技巧n the program. so I see that execution is stopped at those break points, so it is here! but if I search the Output->Debug combobox mode and also Immediate window I cannot find the message I has written for Debug.Writeline anywhere.

I also tried that heck box setting in Debug options that says "Redirect all output to Immediate window"....did not help either.


Discussed already in the comments, but I wasn't sure until discussing it there. However:

  • calls to Debug.Whatever(...) are typically marked with [Conditional("DEBUG")], meaning they require the DEBUG symbol to be defined, otherwise those calls are not compiled
  • a default project has DEBUG and TRACE defined for the "Debug" profile, and TRACE for the "Release" profile
  • however, you can disable the DEBUG symbol via a checkbox in "project properties"

So; go to project-properties, and ensure the DEBUG symbol is defined (or not) as appropriate for your needs (for any-and-all profiles that exist in your project).


Make sure you press F5 to Start Debugging mode (not Ctr+F5).

F5 Starting Debugging

CTRL+F5 Starting Without Debugging

Debug.Writeline is Not printing anything


if Debug does not print anything (and you can't breakpoint on it) : you also have to check "TRACE" in project properties.


If there is still no output after all, check the message types that are enabled for the output window:

  1. Right-Click inside the content area of the Output-Window.
  2. Make sure "Program Output" is selected for example. (It should look like the screenshot)

Debug.Writeline is Not printing anything

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