[ACCEPTED]-Display a message in Visual Studio's output window when not debug mode?-visual-studio

Accepted answer
Score: 27

The results are not in the Output window 4 but in the Test Results Detail (TestResult 3 Pane at the bottom, right click on on Test 2 Results and go to TestResultDetails).

This 1 works with Debug.WriteLine and Console.WriteLine.

Score: 21

The Trace messages can occur in the output 3 window as well, even if you're not in debug 2 mode. You just have to make sure the the 1 TRACE compiler constant is defined.

Score: 13

The Trace.WriteLine method is a conditionally 9 compiled method. That means that it will 8 only be executed if the TRACE constant is 7 defined when the code is compiled. By default 6 in Visual Studio, TRACE is only defined 5 in DEBUG mode.

Right Click on the Project 4 and Select Properties. Go to the Compile 3 tab. Select Release mode and add TRACE 2 to the defined preprocessor constants. That 1 should fix the issue for you.

Score: 8

This whole thread confused the h#$l out 11 of me until I realized you have to be running the debugger to see ANY trace or debug output. I needed a debug 10 output (outside of the debugger) because 9 my WebApp runs fine when I debug it but 8 not when the debugger isn't running (SqlDataSource 7 is instantiated correctly when running through 6 the debugger).

Just because debug output 5 can be seen when you're running in release 4 mode doesn't mean you'll see anything if you're 3 not running the debugger. Careful reading 2 of Writing to output window of Visual Studio? gave me DebugView as an alternative. Extremely useful!

Hopefully 1 this helps anyone else confused by this.

Score: 1

For me this was the fact that debug.writeline 11 shows in the Immediate window, not the Output. My 10 installation of VS2013 by default doesn't 9 even show an option to open the Immediate 8 window, so you have to do the following:

Select Tools -> Customize 
Commands Tab
View | Other Windows menu bar dropdown
Add Command...
The Immediate option is in the Debug section.

Once 7 you have Ok'd that, you can go to View -> Other 6 Windows and select the Immediate Window 5 and hey presto all of the debug output can 4 be seen.

Unfortunately for me it also showed 3 about 50 errors that I wasn't aware of in 2 my project... maybe I'll just turn it off 1 again :-)

Score: 1

To write in the Visual Studio output window 7 I used IVsOutputWindow and IVsOutputWindowPane. I included as members in my 6 OutputWindow class which look like this :

public class OutputWindow : TextWriter
  #region Members

  private static readonly Guid mPaneGuid = new Guid("AB9F45E4-2001-4197-BAF5-4B165222AF29");
  private static IVsOutputWindow mOutputWindow = null;
  private static IVsOutputWindowPane mOutputPane = null;


  #region Constructor

  public OutputWindow(DTE2 aDte)
    if( null == mOutputWindow )
      IServiceProvider serviceProvider = 
      new ServiceProvider(aDte as Microsoft.VisualStudio.OLE.Interop.IServiceProvider);
      mOutputWindow = serviceProvider.GetService(typeof(SVsOutputWindow)) as IVsOutputWindow;

    if (null == mOutputPane)
      Guid generalPaneGuid = mPaneGuid;
      mOutputWindow.GetPane(ref generalPaneGuid, out IVsOutputWindowPane pane);

      if ( null == pane)
        mOutputWindow.CreatePane(ref generalPaneGuid, "Your output window name", 0, 1);
        mOutputWindow.GetPane(ref generalPaneGuid, out pane);
      mOutputPane = pane;


  #region Properties

  public override Encoding Encoding => System.Text.Encoding.Default;


  #region Public Methods

  public override void Write(string aMessage) => mOutputPane.OutputString($"{aMessage}\n");

  public override void Write(char aCharacter) => mOutputPane.OutputString(aCharacter.ToString());

  public void Show(DTE2 aDte)
    aDte.ExecuteCommand("View.Output", string.Empty);

  public void Clear() => mOutputPane.Clear();


If you have 5 a big text to write in output window you 4 usually don't want to freeze the UI. In 3 this purpose you can use a Dispatcher. To write something 2 in output window using this implementation 1 now you can simple do this:

Dispatcher mDispatcher = HwndSource.FromHwnd((IntPtr)mDte.MainWindow.HWnd).RootVisual.Dispatcher;

using (OutputWindow outputWindow = new OutputWindow(mDte))
  mDispatcher.BeginInvoke(DispatcherPriority.Normal, new Action(() =>
    outputWindow.Write("Write what you want here");

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