CODEWITHSUNDEEP
asp.net-corenlog
John Pankowicz
John Pankowicz

Reputation: 4451

NLog - Says "Failed to create file" but correct files are created

The Nlog internal log file says:

Warn FileTarget(Name=allfile): Failed to create file appender: C:\nlog-all-2023-05-26.log Exception: System.UnauthorizedAccessException: Access to the path 'C:\nlog-all-2023-05-26.log' is denied.

Why should I get this warning?

Here is the configuration in program.cs:

NLog.LogManager.Setup().LoadConfigurationFromAppSettings().GetCurrentClassLogger();
var builder = WebApplication.CreateBuilder(args);
builder.Logging.ClearProviders();
builder.Logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
builder.Host.UseNLog();
GlobalDiagnosticsContext.Set("logfilesPath", "C:\Govmeeting\LOGS");

And here are the relevant lines from nlog.config:

<target xsi:type="File" name="allfile" fileName="${gdc:item=logfilesPath}/nlog-all-${shortdate}.log"
layout="${longdate}|${event-properties:item=EventId.Id}|${logger}|${uppercase:${level}}|${message} ${exception}"
archiveEvery="Day" archiveFileName="${gdc:item=logfilesPath}/nlog-${shortdate}.log" />

<logger name="*" minlevel="Trace" writeTo="allfile" />

This happens with Nlog 5.1.5 and 4.7.*

Upvotes: 0

Views: 351

Answers (1)

Rolf Kristensen
Rolf Kristensen

Reputation: 19877

I'm guessing that Logger-output is generated before having assigned GDC-property logfilesPath. Causing the issue with writing to root-folder:

UnauthorizedAccessException: Access to the path 'C:\nlog-all-2023-05-26.log' is denied.

Maybe assign GDC-property very early:

GlobalDiagnosticsContext.Set("logfilesPath", "C:\Govmeeting\LOGS"); // First thing
NLog.LogManager.Setup().LoadConfigurationFromAppSettings();

var builder = WebApplication.CreateBuilder(args);
builder.Logging.ClearProviders();
builder.Logging.SetMinimumLevel(Microsoft.Extensions.Logging.LogLevel.Trace);
builder.Host.UseNLog();

Upvotes: 0

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