Debug.Writeline不打印任何东西

Question

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 run 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.

Answer 1

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).

Answer 2

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

F5 Starting Debugging

CTRL + F5 Starting Without Debugging

Answer 3

如果Debug没有打印任何东西（并且你不能断点）：你还必须检查项目属性中的“TRACE”。

Answer 4

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)