// Ex10_03.cpp : main project file.
  // CLR trace and debug output
  
  include <stdafx.h>
  
  using namespace System;
  using namespace System::Diagnostics;
  
  public ref class TraceTest
  {
  public:
    TraceTest(int n):value(n){}
  
    property TraceLevel Level
    {
      void set(TraceLevel level) {sw->Level = level; }
      TraceLevel get(){return sw->Level; }
    }
    
    void FunA()
    {
      ++value;
      Trace::Indent();
      Trace::WriteLine(L"Starting FunA");
      if(sw->TraceInfo)
        Debug::WriteLine(L"FunA working...");
      FunB();
      Trace::WriteLine(L"Ending FunA");
      Trace::Unindent();
    }
   
    void FunB()
    {
      Trace::Indent();
      Trace::WriteLine(L"Starting FunB");
      if(sw->TraceWarning)
        Debug::WriteLine(L"FunB warning...");
      FunC();
      Trace::WriteLine(L"Ending FunB");
      Trace::Unindent();
    }
  
    void FunC()
    {
      Trace::Indent();
      Trace::WriteLine(L"Starting FunC");
      if(sw->TraceError)
        Debug::WriteLine(L"FunC error...");
      Debug::Assert(value < 4);
      Trace::WriteLine(L"Ending FunC");
      Trace::Unindent();
    }
  private:
    int value;
    static TraceSwitch^ sw =
                        gcnew TraceSwitch(L"Trace Switch", L"Controls trace output");
  };
  
  int main(array<System::String ^> ^args)
  {
    // Direct output to the command line
    TextWriterTraceListener^ listener = gcnew TextWriterTraceListener( Console::Out);
    Debug::Listeners->Add(listener);
  
    Debug::IndentSize = 2;              // Set the indent size
  
    array<TraceLevel>^ levels = { TraceLevel::Off,     TraceLevel::Error,
                                  TraceLevel::Warning ,TraceLevel::Verbose};
    TraceTest^ obj = gcnew TraceTest(0);
  
    Console::WriteLine(L"Starting trace and debug test...");
    for each(TraceLevel level in levels)
    {
      obj->Level = level;                // Set level for messages
      Console::WriteLine(L"\nTrace level is {0}", obj->Level);
      obj->FunA();
    }
   return 0;
  }