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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.diagnostics.debug.listeners below:

Debug.Listeners Property (System.Diagnostics) | Microsoft Learn

Debug.Listeners Property Definition

Gets the collection of listeners that is monitoring the debug output.

public:
 static property System::Diagnostics::TraceListenerCollection ^ Listeners { System::Diagnostics::TraceListenerCollection ^ get(); };

public static System.Diagnostics.TraceListenerCollection Listeners { get; }

static member Listeners : System.Diagnostics.TraceListenerCollection

Public Shared ReadOnly Property Listeners As TraceListenerCollection

Property Value

A TraceListenerCollection representing a collection of type TraceListener that monitors the debug output.

Examples

The following example creates a TextWriterTraceListener that outputs to the console screen. The code then adds the new listener to the Listeners.

/* Create a listener that outputs to the console screen, and
  * add it to the debug listeners. */
var myWriter = new TextWriterTraceListener(System.Console.Out);
Debug.Listeners.Add(myWriter);

' Create a listener that outputs to the console screen, and 
' add it to the debug listeners. 
Dim myWriter As New TextWriterTraceListener(System.Console.Out)
Debug.Listeners.Add(myWriter)

Remarks

The listeners produce formatted output from the debug output. By default, the collection contains an instance of the DefaultTraceListener class. To remove the default listener, call the Remove method, and pass it the instance of the DefaultTraceListener. To redirect output to the console window, add an instance of the ConsoleTraceListener. To redirect output to a file or stream, add an instance of the TextWriterTraceListener.

Note

The Listeners collection is shared by both the Debug and the Trace classes; adding a trace listener to either class adds the listener to both.