dotnet-sdk/examples/Client/DistributedLock/Program.cs

using System;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;

namespace DistributedLock
{
    public class Program
    {
        static string DEFAULT_APP_PORT = "22222";
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>()
                        .UseUrls($"http://localhost:{Environment.GetEnvironmentVariable("APP_PORT") ?? DEFAULT_APP_PORT}");
                });
    }
}