ASP.NET Core Web API Logging from a Static Class

Question

I\'m logging just fine using dependency injection on my controllers, now I need to log something from a static class.

How can I log from

Answer 1

Solution is to have a static reference to the LoggerFactory in a utility static class initialized on startup:

/// 

    /// Shared logger
    /// 
    internal static class ApplicationLogging
    {
        internal static ILoggerFactory LoggerFactory { get; set; }// = new LoggerFactory();
        internal static ILogger CreateLogger() => LoggerFactory.CreateLogger();        
        internal static ILogger CreateLogger(string categoryName) => LoggerFactory.CreateLogger(categoryName);

    }

Which you intialize on Startup.cs:

 public Startup(ILogger logger, ILoggerFactory logFactory, IHostingEnvironment hostingEnvironment)
        {
            _log = logger;
            _hostingEnvironment = hostingEnvironment;
            Util.ApplicationLogging.LoggerFactory = logFactory;//<===HERE

        }

Then you can build a logger to use from your static class like so:

internal static class CoreJobSweeper
    {
        private static ILogger log = Util.ApplicationLogging.CreateLogger("CoreJobSweeper");