Multi-Targeting Program.cs

Program.cs

#if NETCOREAPP2_2
using Microsoft.AspNetCore;
#endif
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;

namespace Sample.WebService
{
    public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

#if NETCOREAPP2_2
        public static IWebHostBuilder CreateHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>();
#endif

#if NETCOREAPP3_0 || NETCOREAPP3_1
        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
               .ConfigureWebHostDefaults(webBuilder =>
               {
                   webBuilder.UseStartup<Startup>();
               });
#endif
    }
}