NLog.Targets.MauiLog

NLog Target for debugging on MAUI / Xamarin Mobile Platforms:

• Apple iOS / MacOS - Unified Logging OSLog (replacement of print and NSLog)
• Android - Android.Util.Log / LogCat
• NetStandard - System.Diagnostics.Debugger.Log

How to setup NLog in MAUI

1. Install the NLog packages

   • Install-Package NLog.Targets.MauiLog
   • Install-Package NLog.Extensions.Logging

   or in your csproj (Use ver. 8 for NET8, and ver. 7 for NET7 etc.):

   <PackageReference Include="NLog.Targets.MauiLog" Version="8.*" />
   <PackageReference Include="NLog.Extensions.Logging" Version="5.*" />

2. Add NLog to the MauiApp

   Update MauiProgram.cs to include NLog as Logging Provider:

   var builder = MauiApp.CreateBuilder();
   
   // Add NLog for Logging
   builder.Logging.ClearProviders();
   builder.Logging.AddNLog();

   If getting compiler errors with unknown methods, then update using-section:

   using Microsoft.Extensions.Logging;
   using NLog;
   using NLog.Extensions.Logging;

3. Load NLog configuration for logging

   Add the NLog.config-file into the Application-project as assembly-resource (Build Action = embedded resource), and load like this:

   NLog.LogManager.Setup().RegisterMauiLog()
       .LoadConfigurationFromAssemblyResource(typeof(App).Assembly);

   Alternative setup NLog configuration using fluent-API:

   var logger = NLog.LogManager.Setup().RegisterMauiLog()
                    .LoadConfiguration(c => c.ForLogger().FilterMinLevel(NLog.LogLevel.Debug).WriteToMauiLog())
                    .GetCurrentClassLogger();

Configuration options for MAUI Log Target

• Layout - LogEvent message layout
• Category - LogEvent category layout (optional)

Example NLog.config-file:

<nlog>
<extensions>
    <add assembly="NLog.Targets.MauiLog" />
</extensions>
<targets>
    <target name="mauilog" type="MauiLog" />
</targets>
<rules>
    <logger name="*" minLevel="Info" writeTo="mauilog" />
</rules>
</nlog>

See also Logging Unhandled Exceptions