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title Debug Class (C++/CLI) | Microsoft Docs
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ms.date 11/04/2016
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Trace class, Visual C++
.NET Framework [C++], Debug class
Debug class
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Debug Class (C++/CLI)

When using xref:System.Diagnostics.Debug in a Visual C++ application, the behavior does not change between a debug and a release build.

Remarks

The behavior for xref:System.Diagnostics.Trace is identical to the behavior for the Debug class, but is dependent on the symbol TRACE being defined. This means that you must #ifdef any Trace-related code to prevent debug behavior in a release build.

Example

Description

The following sample always executes the output statements, regardless of whether you compile with /DDEBUG or /DTRACE.

Code

// mcpp_debug_class.cpp  
// compile with: /clr  
#using <system.dll>  
using namespace System::Diagnostics;  
using namespace System;  
  
int main() {  
   Trace::Listeners->Add( gcnew TextWriterTraceListener( Console::Out ) );  
   Trace::AutoFlush = true;  
   Trace::Indent();  
   Trace::WriteLine( "Entering Main" );  
   Console::WriteLine( "Hello World." );  
   Trace::WriteLine( "Exiting Main" );  
   Trace::Unindent();  
  
   Debug::WriteLine("test");  
}

Output

    Entering Main  
Hello World.  
    Exiting Main  
test

Example

Description

To get the expected behavior (that is, no "test" output printed for a release build), you must use the #ifdef and #endif directives. The previous code sample is modified below to demonstrate this fix:

Code

// mcpp_debug_class2.cpp  
// compile with: /clr  
#using <system.dll>  
using namespace System::Diagnostics;  
using namespace System;  
  
int main() {  
   Trace::Listeners->Add( gcnew TextWriterTraceListener( Console::Out ) );  
   Trace::AutoFlush = true;  
   Trace::Indent();  
  
#ifdef TRACE   // checks for a debug build  
   Trace::WriteLine( "Entering Main" );  
   Console::WriteLine( "Hello World." );  
   Trace::WriteLine( "Exiting Main" );  
#endif  
   Trace::Unindent();  
  
#ifdef DEBUG   // checks for a debug build  
   Debug::WriteLine("test");  
#endif   //ends the conditional block  
}

See Also

.NET Programming with C++/CLI (Visual C++)