NLog: Xamarin UWP doesn't create a logfile

Type (choose one):

• Bug

NLog version: 4.5.0-rc07

Platform: .Net 4.7

Current NLog config

<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:schemaLocation="http://www.nlog-project.org/schemas/NLog.xsd NLog.xsd"
      autoReload="true"
      throwExceptions="false"
      internalLogLevel="Trace" internalLogFile="C:\Users\<Path>\nlog-internal.log">
    <targets>
        <target name="file" xsi:type="File"
                layout="${date} | ${level} | ${message}"             
                fileName="${specialfolder:folder=ApplicationData}/qkiss_app-${shortdate}.log"
                keepFileOpen="false"
                encoding="utf-8" />
    </targets>
    <rules>
        <logger name="*" minlevel="Info" writeTo="file" />
    </rules>
</nlog>

No log file gets created, even when I use the absolute path for my machine: C:/Users/<UserName>/AppData/Local/Packages/<PackageName>/LocalState/<filePrefix>-${shortdate}.log

What is the current result?

• The logger works fine in debug mode (UWP App)
• Log file won’t be created under ReleaseMode. -> .Net Native compilation is on and may couse some errors (Reflection etc.)
• ${environment:USERPROFILE} won’t work either

What is the expected result?

• Creating the log file under ReleaseMode like under DebugMode

Did you checked the Internal log?

• It wasn’t created. I did set internalLogLevel=Trace and path for internalLogFile=“C:\Users.…\log.log”

Please post full exception details (message, stacktrace, inner exceptions)

• I don’t get an exception. The log file never gets created

Are there any workarounds?

• None that I know of

Is there a version in which it did work?

• I don’t it had ever worked with UWP ReleaseMode

Environment:

• Visual Studio 2017 Version 15.6.4
• .Net Versione 4.7.0.2556
• NetStandard 2.0.1
• NLOG 4.5.0-rc07