问日志信息最佳实践

EN

//Context value names
public static class DiagnosticContextValueNames
{
  public static string TransactionId = "transactionid";
  public static string SessionId = "sessionid";
}

//In your code
log4net.ThreadContext.Properties[DiagnosticContextValueNames.TransactionId] = GetTransactionId();
log4net.ThreadContext.Properties[DiagnosticContextValueNames.SessionId] = GetSessionId();

//Somewhere later on...
logger.Info("hello");  // this message can be tagged with the transaction id and session id if you use the appropriate formatting options

public static class LoggingExtensions
{
  public static void SetTransactionId(this ThreadContextProperties props, string trans)
  {
    props["TransactionId"] = trans;

    // Or, using constants as defined above...
    props[ThreadContextValueNames.TransactionId] = trans;
  }
}


// In your code...
log4net.ThreadContext.Properties.SetTransactionId(GetTransactionId());

// As compared to this:
log4net.ThreadContext.Properties["transactionid"] = GetTransactionId();

// This approach requires more effort than simply populating the context properties "normally", and
// is probably overkill for most situations.  However, it can prove useful if you are able
// to have access to the context information that you want to log from within the Log method
// of the logger.
public void Log(type loggerBoundaryDeclaringType, LogLevel level, object message, object exception)
{
  log4net.ThreadContext.Properties["transactionid"] = GetTransactionId();
  log4net.ThreadContext.Properties["sessionid"] = GetSessionId();
  _logger.Log(loggerBoundaryDeclaringType, level, message, exception);
}