Logger.cs

using System.Runtime.InteropServices;
using Microsoft.Extensions.Logging;
using SelloutReportingService.Services;

namespace SelloutReportingService
{
    /// <summary>
    /// Static class holding the default logger instance.
    /// </summary>
    public static class Logger
    {
        /// <summary>
        /// Our default <see cref="ILogger" /> instance.
        /// </summary>
        /// <remarks>
        /// This instance logs to console and Windows Event Log if running under Windows.
        /// </remarks>
        public static readonly ILogger Instance = LoggerFactory
            .Create(configure =>
            {
                configure
                    .AddConsole(o => { o.TimestampFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss'.'fffffffK"; })
                    .AddConfiguration(Configuration.Instance);

                if (!RuntimeInformation.IsOSPlatform(OSPlatform.Windows)) return;
                
                const string logName = "Application";
                const string sourceName = "SelloutReportingService";
                    
                if (!System.Diagnostics.EventLog.SourceExists(sourceName))
                {
                    System.Diagnostics.EventLog.CreateEventSource(sourceName, logName);
                }
                    
                configure.AddEventLog(settings =>
                {
                    settings.LogName = logName;
                    settings.SourceName = sourceName;
                });
            })
            .CreateLogger<ReportingServiceControl>();
    }
}