static void Main(string[] args)
{
Console.WriteLine("Hello World!");
A.F();
new B().F();
C.F();
new D().F();
E.F();
IHost host = Host.CreateDefaultBuilder(args)
.ConfigureServices(
(_, services) =>
services
//.AddTransient<IFService, FService>()
//.AddScoped<IFService, FService>()
.AddSingleton <IFService, FService>()
).Build();
IFService iFService = host.Services.GetRequiredService <IFService>();
iFService.F();
host.RunAsync();
}
