Serilog Typical setup for Log to RollingFile from Config. with fallback

LoggingConfig.cs

static class LoggingConfig
{
  /// <summary>
  /// After calling this method, use the logger with 
  /// <code>Log.Logger....</code>
  /// e.g.
  /// <see cref="Log.Logger"/>.<see cref="ILogger.Debug(string,object[])"/>
  /// </summary>
  public static ILogger RegisterLogger(ILogger overrideLogger=null)
  {
      IsInitted = true;
      return Log.Logger = overrideLogger ?? (LoggerConfigurationForWriteToLogFile().CreateLogger());
  }

  static LoggerConfiguration LoggerConfigurationForWriteToLogFile()
  {
      var loggingPath = @"C:\Logs\AppName.{Date}.txt";
      var fileSizeLimitBytes = 1000000; 
      var retainedFileCountLimit = 99;
      try
      {
          loggingPath = ConfigurationManager.AppSettings["serilog:write-to:RollingFile.pathFormat"];
          retainedFileCountLimit = int.Parse(ConfigurationManager.AppSettings["serilog:write-to:RollingFile.retainedFileCountLimit"]);
          fileSizeLimitBytes = int.Parse(ConfigurationManager.AppSettings["serilog:write-to:RollingFile.fileSizeLimitBytes"]);
      }
      catch{}

      return new LoggerConfiguration()
          .MinimumLevel.Is(RestrictedToMinimumLevel)
          .WriteTo.RollingFile(
              loggingPath,
              retainedFileCountLimit: retainedFileCountLimit,
              fileSizeLimitBytes: fileSizeLimitBytes,
              shared: true
          );
  }

  public static ILogger Logger { get { return IsInitted ? Log.Logger : RegisterLogger(); } }
  public static string Template { get; private set; }
  internal static bool IsInitted;
  internal static LogEventLevel RestrictedToMinimumLevel;

  static LoggingConfig()
  {
      Serilog.Debugging.SelfLog.Enable(Console.Out);
      try   { RestrictedToMinimumLevel = (LogEventLevel)Enum.Parse(typeof(LogEventLevel), ConfigurationManager.AppSettings["serilog:minimum-level"]); }
      catch { RestrictedToMinimumLevel = LogEventLevel.Debug; }
      Template = " \nUrl: {RequestUrl}\nUrlReferrer: {UrlReferrer}\n";
  }
}