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Walkthrough: Creating a Custom Trace Listener

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The latest Enterprise Library information can be found at the Enterprise Library site.

This walkthrough demonstrates how to create a custom trace listener for use with the Logging Application Block.

To reproduce the demonstration

  1. Add a new class named DebugTraceListener to your project.
  2. Specify that the class derives from CustomTraceListener.
  3. Add the class attribute ConfigurationElementType. Specify the type CustomTraceListenerData as the attribute parameter.
  4. [ConfigurationElementType(typeof(CustomTraceListenerData))]
    public class DebugTraceListener : CustomTraceListener
    
    
  5. Add the TraceData method to your class, and then implement the behavior required when logging to your custom trace listener.
  6. public override void TraceData(TraceEventCache eventCache, string source, TraceEventType eventType, int id, object data)
    {
      if (data is LogEntry && this.Formatter != null) 
      {
        this.WriteLine(this.Formatter.Format(data as LogEntry));
      }
      else
      {
        this.WriteLine(data.ToString());
      }
    }
    
    
  7. Override the Write and WriteLine methods to implement the behavior required when logging to your custom trace listener.
  8. public override void Write(string message)
    {
      Debug.Write(message);
    }
    
    public override void WriteLine(string message)
    {
      Debug.WriteLine(message);
    }
    
    
  9. Configure the application to use the Logging Application Block.
  10. In the Enterprise Library configuration tools, configure a new custom trace listener.
  11. Specify DebugTraceListener as the type name.
  12. Create or modify existing categories to use the custom trace listener.

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