Where Does `System.Diagnostics.Debug.WriteLine` Output Go, and How Can I Change It?

System.Diagnostics.Debug.Write Output Locations

When debugging a C# program, System.Diagnostics.Debug.WriteLine calls are displayed in the output window (Ctrl Alt O). However, if this isn't happening, there may be a reason.

Firstly, ensure that "Redirect all Output Window text to the Immediate Window" is unchecked under Tools → Options → Debugging → General.

If that's not the issue, remember that System.Diagnostics.Debug.WriteLine calls can also be directed to other locations by adding a TraceListener to the Debug.Listeners collection. This allows you to customize where Debug.WriteLine output is displayed.

For example, if you add the following code to your program:

using System.Diagnostics;
using System.Diagnostics.TextWriterTraceListener;

// Create a text writer.
var traceListener = new TextWriterTraceListener("MyLog.txt");

// Add the trace listener to the debug listeners collection.
Debug.Listeners.Add(traceListener);

Debug.WriteLine calls will now be output to the file "MyLog.txt". You can also specify other TraceListeners, such as an EventLogTraceListener or a ConsoleTraceListener, to output Debug.WriteLine calls to different locations.

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