public static IApplicationBuilder UseMyFileLogger(this IApplicationBuilder app, MyFileLoggerOptions options)
 {
     return(app.UseMiddleware <MyFileLoggerMiddleware>(Options.Create(options)));
 }
 public MyFileLoggerMiddleware(RequestDelegate next, IOptions <MyFileLoggerOptions> options)
 {
     _next    = next;
     _options = options.Value;
 }