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NLog environment layout renderer doesn't work when run as a scheduled task


NLog environment layout renderer doesn't work when run as a scheduled task

By : Chupacabra
Date : November 22 2020, 03:01 PM
should help you out I think this is the problem, when changing the environment variable, you need to restart Taskeng.exe.
code :


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Performance Implications of Callsite Layout Renderer in NLog

Performance Implications of Callsite Layout Renderer in NLog


By : Keshav Gopal
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The .NET framework does not provide many more options [1] to get a stacktrace than to use the StackTrace class, either directly or via Exception or Environment.StackTrace as a string, so there is little more NLog can do. Furthermore the callstack will (potentially) be different for each log call made. The one exception being a log call inside a loop. But even in that case there would need to be some machinery to help NLog even know that the call was made from the "same location" as the previous one. That could only be determined looking (again) at the callstack.
So, all in all, I would assume NLog must do exactly that: capture the callstack on every log call being made (although not for every layout/appender that processes the call) - just like log4net by the way, which "warns" about this option being a performance issue with a high frequency of log calls.
nlog renderer for types other than the Layout (for target attributes)

nlog renderer for types other than the Layout (for target attributes)


By : user2837381
Date : March 29 2020, 07:55 AM
Does that help I am trying to configure mail target by params from app.config using custom renderer. My NLog Mail Target: , I resolve this issue using custom Target derived from MailTarget:
code :
[Target("MyMail")]
class MyMailTarget : MailTarget
{
    /// <summary>
    /// Wrapper for enum to use placeholders
    /// </summary>
    [DefaultValue("None")]
    public Layout SmtpAuth { get; set; }

    protected override void Write(NLog.Common.AsyncLogEventInfo logEvent)
    {
        Write(new[] {logEvent});
    }

    protected override void Write(NLog.Common.AsyncLogEventInfo[] logEvents)
    {
        var renderedAuthType = SmtpAuth.Render(logEvents.Last().LogEvent);
        SmtpAuthenticationMode mode;
        if (Enum.TryParse(renderedAuthType, true, out mode))
            SmtpAuthentication = mode;
        else
        {
            InternalLogger.Warn("Could not convert '{0}' to SmtpAuthenticationMode, valid values are None, Basic and Ntlm.");
            throw new NLogRuntimeException(String.Format("Cannot render SmtpAuthentication. SmtpAuth = {0}", renderedAuthType));
        }
        base.Write(logEvents);
    }
}
<extensions>
  <add assembly="AssemplyNameWithMyMailTarget" />
</extensions>

<variable name="smtpAuth" value="${app-settings:alerting.SMTP.Authentication}"/>

<!-- smtpAuth - my custom attribute -->

<target name="AlertMail" xsi:type="MyMail"
  to="${mailTo}"
  from="${mailFrom}"
  subject="[APPNAME][ALERT][${mailEnv}][${instanceName}]"
  smtpServer="${smtpHost}"
  smtpAuth="${smtpAuth}" 
  smtpUserName="${smtpUserName}"
  smtpPassword="${smtpPassword}"
  layout="${longdate}${newline}${message}${newline}"
  />
NLog custom layout renderer exception

NLog custom layout renderer exception


By : Kristian Smilenov
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further I have found a solution to avoid using layout renderer for a custom layout renderer's parameter which takes ${exception}. I am just using a LogEventInfo.Exception from an overriden Append method:
code :
protected override void Append(StringBuilder builder, LogEventInfo logEvent)
{
    var whatever = logEvent.Exception;
}
How to modify the ${stacktrace} layout renderer in NLog

How to modify the ${stacktrace} layout renderer in NLog


By : Sildirc Stormwind
Date : March 29 2020, 07:55 AM
like below fixes the issue You can create custom LayoutRenderer, which will skip some stack frames:
Using nlog replace layout renderer, replacement seems to be done twice instead of once

Using nlog replace layout renderer, replacement seems to be done twice instead of once


By : trelozakinthinos
Date : March 29 2020, 07:55 AM
may help you . Turns out this problem has nothing to do with Nlog. It's just the regular expression that is the problem - identical to the problem found here:
Why does my Regex.Replace string contain the replacement value twice?
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