Trace Listener

WmiTraceListener.cs

using Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation;
using Microsoft.Practices.EnterpriseLibrary.Logging;
using Microsoft.Practices.EnterpriseLibrary.Logging.Instrumentation;
using System.Diagnostics;
using System.Management.Instrumentation;

namespace Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners
{
  /// <summary>
  /// WmiTraceListener is a <see cref="T:System.Diagnostics.TraceListener"/> that send a WMI event
  /// 
  /// </summary>
  public class WmiTraceListener : TraceListener, IInstrumentationEventProvider
  {
    private LoggingInstrumentationProvider instrumentationProvider;

    /// <summary>
    /// Initializes a new instance of <see cref="T:Microsoft.Practices.EnterpriseLibrary.Logging.TraceListeners.WmiTraceListener"/>
    /// </summary>
    public WmiTraceListener()
    {
      this.instrumentationProvider = new LoggingInstrumentationProvider();
    }

    /// <summary>
    /// Sends an event given a predefined string
    /// 
    /// </summary>
    /// <param name="message">The string to write as the event</param>
    public override void Write(string message)
    {
      Instrumentation.Fire((object) new LogEntry()
      {
        Message = message
      });
    }

    /// <summary>
    /// Sends an email message given a predefined string
    /// 
    /// </summary>
    /// <param name="message">The string to write as the email message</param>
    public override void WriteLine(string message)
    {
      this.Write(message);
    }

    /// <summary>
    /// Delivers the trace data as an event.
    /// 
    /// </summary>
    /// <param name="eventCache">The context information provided by <see cref="N:System.Diagnostics"/>.</param><param name="source">The name of the trace source that delivered the trace data.</param><param name="eventType">The type of event.</param><param name="id">The id of the event.</param><param name="data">The data to trace.</param>
    public override void TraceData(TraceEventCache eventCache, string source, TraceEventType eventType, int id, object data)
    {
      if (this.Filter != null && !this.Filter.ShouldTrace(eventCache, source, eventType, id, (string) null, (object[]) null, data, (object[]) null))
        return;
      if (data is LogEntry)
      {
        Instrumentation.Fire((object) (data as LogEntry));
        this.instrumentationProvider.FireTraceListenerEntryWrittenEvent();
      }
      else if (data is string)
        this.Write(data);
      else
        base.TraceData(eventCache, source, eventType, id, data);
    }

    /// <summary>
    /// This method supports the Enterprise Library infrastructure and is not intended to be used directly from your code.
    ///             Returns the object that provides instrumentation services for the trace listener.
    /// 
    /// </summary>
    /// <see cref="M:Microsoft.Practices.EnterpriseLibrary.Common.Instrumentation.IInstrumentationEventProvider.GetInstrumentationEventProvider"/>
    /// <returns>
    /// The object that providers intrumentation services.
    /// </returns>
    public object GetInstrumentationEventProvider()
    {
      return (object) this.instrumentationProvider;
    }
  }
}