public MaintenanceMiddleware(RequestDelegate next, MaintenancePage maintenancePage,
ILogger <MaintenanceMiddleware> logger)
{
_next = next;
_logger = logger;
_maintenancePage = maintenancePage;
}
public static IServiceCollection AddMaintenance(this IServiceCollection services,
MaintenancePage maintenancePage)
{
services.AddSingleton(maintenancePage);
return(services);
}