ConfigureserviceswithoutStartup.md - brainchildservices/curriculum GitHub Wiki

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Configure services without Startup

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To configure services and the request processing pipeline without using a Startup class, call ConfigureServices and Configure convenience methods on the host builder. Multiple calls to ConfigureServices append to one another. If multiple Configure method calls exist, the last Configure call is used.

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

      public static IHostBuilder CreateHostBuilder(string[] args) =>
          Host.CreateDefaultBuilder(args)
              .ConfigureAppConfiguration((hostingContext, config) =>
              {
              })
              .ConfigureWebHostDefaults(webBuilder =>
              {
                  webBuilder.ConfigureServices(services =>
                  {
                      services.AddControllersWithViews();
                  })
                  .Configure(app =>
                  {
                      var loggerFactory = app.ApplicationServices
                          .GetRequiredService<ILoggerFactory>();
                      var logger = loggerFactory.CreateLogger<Program>();
                      var env = app.ApplicationServices.GetRequiredService<IWebHostEnvironment>();
                      var config = app.ApplicationServices.GetRequiredService<IConfiguration>();
  
                      logger.LogInformation("Logged in Configure");

                      if (env.IsDevelopment())
                      {
                    app.UseDeveloperExceptionPage();
                      }
                      else
                      {
                          app.UseExceptionHandler("/Home/Error");
                          app.UseHsts();
                      }

                      var configValue = config["MyConfigKey"];
                  });
              });
          });
  }
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