static void Main(string[] args)
{
IAppHost host = new AppHostBuilder()
.UseArguments(args)
.ConfigureServices(s => s.AddSingleton <IDemo, Demo>())
.Build();
host.Run(app =>
{
var demo = app.Services.GetRequiredService <IDemo>();
app.Arguments.ToList().ForEach(arg => Console.WriteLine(arg));
Console.ReadKey();
});
}