Exemples de traceLogging .NET

Cette rubrique contient un exemple de traceLogging .NET qui montre comment journaliser un événement uniquement lorsque le niveau de détail de la session est détaillé et comment journaliser des données d’événement structurées.

using System;
using System.Text;
using System.Diagnostics.Tracing;

namespace MoreSimpleTraceLoggingExamples
{
    class Program
    {
        private static EventSource log = new EventSource(
            "SimpleTraceLoggingProvider",
            EventSourceSettings.EtwSelfDescribingEventFormat);

        static void Main(string[] args)
        {
            StringBuilder cmdLine = new StringBuilder();
            foreach (string arg in args)
            {
                cmdLine.AppendFormat("{0} ", arg);
            }

            // Log event verbosity level and opcode
            // This event is only logged when the session verbosity level is verbose.
            log.Write("CmdLine", new EventSourceOptions {Level=EventLevel.Verbose, Opcode=EventOpcode.Info },
                                 new { Args = cmdLine.ToString().TrimEnd() });

            try
            {
                int j = 0;
                int i = 1 / j;
            }
            catch (Exception e)
            {
                var error = new Error { ErrorTitle = e.Message, CallStack = e.StackTrace, ErrType = ErrorType.Exception };
                log.Write("Error", new { Error = error, ErrorType = e.ToString() });
            }
        }
    }

    [EventData] // [EventData] makes it possible to pass an instance of the class as an argument to EventSource.Write()
    public class Error
    {
        public string ErrorTitle { get; set; }
        public string CallStack { get; set; }
        public ErrorType ErrType { get; set; }
    }

    public enum ErrorType
    {
        Exception,
        UserError,
        ProgramError
    }
}