hello-world-startup-multiple-configure-environment-services


using Microsoft.AspNetCore.Hosting; //IWebHostBuilder
using Microsoft.AspNetCore.Builder; //IApplicationBuilder
using Microsoft.AspNetCore.Http; //WriteAsync
using Microsoft.AspNetCore; //webHost
using Microsoft.Extensions.Logging;//ILoggerFactory
using Microsoft.Extensions.DependencyInjection; // IServiceCollection

namespace WebApplication1
{
    public class Greet
    {
        string _greeting;

        public Greet(string greeting)
        {
            _greeting = greeting;
        }

        public string Say() => _greeting;
    }

    public class Startup
    {
        public void ConfigureProductionServices(IServiceCollection services)
        {
            services.AddSingleton(new Greet("Hello Production"));
        }

        public void ConfigureDevelopmentServices(IServiceCollection services)
        {
            services.AddSingleton(new Greet("Hello Development"));
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)
        {
            //These are the three default services available at Configure

            app.Run(context =>
            {
                var greeter = context.RequestServices.GetService<Greet>();
                if (greeter == null)
                    return context.Response.WriteAsync($"Greeter is null");
                else
                    return context.Response.WriteAsync($"{greeter.Say()}");
            });
        }
    }

    public class Program
    {
        public static void Main(string[] args)
        {
            CreateWebHostBuilder(args).Build().Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>()
                .UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction
    }
}

using Microsoft.AspNetCore.Hosting; //IWebHostBuilder

using Microsoft.AspNetCore.Builder; //IApplicationBuilder

using Microsoft.AspNetCore.Http; //WriteAsync

using Microsoft.AspNetCore; //webHost

using Microsoft.Extensions.Logging;//ILoggerFactory

using Microsoft.Extensions.DependencyInjection; // IServiceCollection

namespace WebApplication1

{

public class Greet

{

string _greeting;

public Greet(string greeting)

{

_greeting = greeting;

}

public string Say() => _greeting;

}

public class Startup

{

public void ConfigureProductionServices(IServiceCollection services)

{

services.AddSingleton(new Greet("Hello Production"));

}

public void ConfigureDevelopmentServices(IServiceCollection services)

{

services.AddSingleton(new Greet("Hello Development"));

}

public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory logger)

{

//These are the three default services available at Configure

app.Run(context =>

{

var greeter = context.RequestServices.GetService<Greet>();

if (greeter == null)

return context.Response.WriteAsync($"Greeter is null");

else

return context.Response.WriteAsync($"{greeter.Say()}");

});

}

public class Program

{

public static void Main(string[] args)

{

CreateWebHostBuilder(args).Build().Run();

}

public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>

WebHost.CreateDefaultBuilder(args)

.UseStartup<Startup>()

.UseEnvironment("Development"); //You can change this to "Production" to use StartupProduction

}

결과:
Hello Development