public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true);

            //判斷運行環境
            if (env.IsDevelopment())
            {
                // For more details on using the user secret store see //go.microsoft.com/fwlink/?LinkID=532709
                builder.AddUserSecrets();

                // This will push telemetry data through Application Insights pipeline faster, allowing you to view results immediately.
                builder.AddApplicationInsightsSettings(developerMode: true,endpointAddress:"localhost:5000");
            }

            builder.AddEnvironmentVariables();
            Configuration = builder.Build();
 
        }

　　　　 public static void Main(string[] args)
        {
            var host = new WebHostBuilder()
                    .UseKestrel()
                    .UseContentRoot(Directory.GetCurrentDirectory())
                    .UseIISIntegration()
                    .UseStartup<Startup>()
                    .UseUrls("//192.168.2.22:5000")
                    .Build();


            host.Run();
            host.Run();
        }