Internal logging reports logger writing to target that failed to initialize #5674
Description
NLog version: 5.3.4
Platform: .NET8
Current NLog config: None
The code below uses the fluent interface to setup up logging. There is a bug in the code in that the [RequiredParameter] on the custom target is not set. However, the internal logging still reports that it will be writing to custom target, but it does not actually write there.
2025-01-23 19:37:23.4108 Debug Targets configured when LogLevel >= Trace for Logger: ConsoleApp1.Program
2025-01-23 19:37:23.4108 Debug Logger ConsoleApp1.Program [Trace] => MyCustom
2025-01-23 19:37:23.4108 Debug Logger ConsoleApp1.Program [Debug] => MyCustom
2025-01-23 19:37:23.4108 Debug Logger ConsoleApp1.Program [Info] => MyCustom
Ideally the internal logging would look something more like below. At minimum it should not be listing MyCustom as a target it will write to.
2025-01-23 19:37:23.4108 Debug Targets configured when LogLevel >= Trace for Logger: ConsoleApp1.Program
2025-01-23 19:37:23.4108 Warn Logger ConsoleApp1.Program [Trace] => None (Initialization failed for MyCustom)
2025-01-23 19:37:23.4108 Warn Logger ConsoleApp1.Program [Debug] => None (Initialization failed for MyCustom)
2025-01-23 19:37:23.4108 Warn Logger ConsoleApp1.Program [Info] => None (Initialization failed for MyCustom)
Sample code
using NLog.Config;
using NLog.Targets;
using NLog;
LogManager.Setup()
.LoadConfiguration(builder =>
{
//Note: RequiredParameter "MyParameter" is not set
var myTarget = new MyCustomTarget();
var errorLogsBuilder = builder.ForLogger().WriteTo(myTarget);
})
.SetupInternalLogger(internalBuilder =>
{
internalBuilder.LogToConsole(true);
internalBuilder.SetMinimumLogLevel(LogLevel.Trace);
});
var logger = LogManager.GetCurrentClassLogger();
Console.WriteLine("Before Info Logged");
logger.Info("Info Logged");
Console.WriteLine("After Info Logged");
[Target("MyCustomTarget")]
public class MyCustomTarget : Target
{
[RequiredParameter]
public string? MyParameter { get; set; }
protected override void InitializeTarget()
{
Console.WriteLine("InitializeTarget");
base.InitializeTarget();
}
protected override void Write(LogEventInfo logEvent)
{
Console.WriteLine("Write - " + logEvent.FormattedMessage);
}
}