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

var config = new ConfigurationBuilder().AddCommandLine(args).AddEnvironmentVariables(prefix: "ASPNETCORE_").AddJsonFile("hosting.json", optional: true).Build();var host = new WebHostBuilder().UseConfiguration(config)

{"server.urls": "http://*:5000;http://*:8001","environment": "Development"
}

public class Program
{public static void Main(string[] args){var config = new ConfigurationBuilder().AddJsonFile("hosting.json", optional: true).Build();var host = new WebHostBuilder().UseUrls("http://*:5000").UseKestrel().UseContentRoot(Directory.GetCurrentDirectory()).UseStartup<Startup>().UseConfiguration(config).Build();host.Run();}
}

"buildOptions": {"emitEntryPoint": true,"preserveCompilationContext": true,"copyToOutput": "hosting.json"
},
"publishOptions": {"include": ["hosting.json"]
}

Hosting environment: Development
Content root path: C:\Dev\Cnblogs.WebDemo
Now listening on: http://*:5000
Now listening on: http://*:8001
Application started. Press Ctrl+C to shut down.

public class Program
{public static void Main(string[] args){BuildWebHost(args).Run();}public static IWebHost BuildWebHost(string[] args){var config = new ConfigurationBuilder().AddJsonFile("hosting.json", optional: true).AddCommandLine(args).Build();return WebHost.CreateDefaultBuilder(args)                .UseConfiguration(config).UseStartup<Startup>().Build();}
}