My application has too much log.Trace() at the beginning of the program, causing the program to malfunction, so I can't use general NLog configuration to increase the log level.

So, I would like to increase the log level at runtime. For that, I've found something like this on the internet:

foreach (var rule in LogManager.Configuration.LoggingRules)
{
    // Iterate over all levels up to and including the target, (re)enabling them.
    for (int i = 0; i <= 5; i  )
    {
        rule.EnableLoggingForLevel(LogLevel.FromOrdinal(i));
    }
}

This, however, seems not to be working as the following line does not show up in the logs, although I'm sure this line has been passed:

log.Trace("log trace works!");

Does anybody know a way to make sure that, from a certain moment in my source code, I can see log.Trace() results?

For your information:

1. log is defined as private static readonly Logger log = LogManager.GetCurrentClassLogger();.
2. I've been looking for an nlog.* file, containing an <nlog> tag, I didn't find anything.

Edit:
I'm working with NLog version 4.5.4.

Edit2 (try to force reading of configuration):
I've modified the nlog.config file as follows:

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" autoReload="true">

    <variable name="myLevel" value="Trace" />
    <rules>
      <logger minLevel="${var:myLevel}" />
    </rules>
    ...

Then I tried to force the re-reading of that configuration, as follows:

NLog.LogManager.Setup().LoadConfigurationFromFile("C:\\...\\NLog.config");

Thanks in advance

CodePudding user response：

Calling LogManager.ReconfigExistingLoggers() after the loop seems to work for me.

Config

<logger name="*" minlevel="Info" writeTo="console" />

Code

logger.Trace("Trace 1");
logger.Info("Info 1");

foreach (var rule in LogManager.Configuration.LoggingRules)
{
    for (var i = 0; i <= 5; i  )
    {
        rule.EnableLoggingForLevel(LogLevel.FromOrdinal(i));
    }
}

LogManager.ReconfigExistingLoggers();

logger.Trace("Trace 2"); // This is now printed.
logger.Info("Info 2");