.NET Core 2.1 GenericHost Sample

Program.cs

class Program
{
    static async Task Main(string[] args)
    {
        await new HostBuilder()
            .ConfigureAppConfiguration((hostContext, configApp) =>
            {
                // Configの追加
                hostContext.HostingEnvironment.EnvironmentName = System.Environment.GetEnvironmentVariable("NETCORE_ENVIRONMENT") ?? "production";
                configApp.SetBasePath(Path.GetDirectoryName(Process.GetCurrentProcess().MainModule.FileName));
                configApp.AddCommandLine(args);
                configApp.AddJsonFile($"appsettings.{hostContext.HostingEnvironment.EnvironmentName}.json");
            })
            .ConfigureServices(services =>
            {
               // サービス処理のDI
                services.AddSingleton<IFooService, FooService>();
                services.AddSingleton<IBarService, BarService>();
            })
            .ConfigureLogging((context, b) =>
            {
                b.SetMinimumLevel(LogLevel.Debug);

               // Console ロガーの追加
                b.AddConsole();

                // NLog や Log4Net、SeriLog などを追加

                // あるいはApplication Insight の追加
            })
            .RunConsoleAsync()
    }
}