Adding Startup.cs back to .NET 6 Project

When .NET 6 was released, the first big change was the lack of Startup.cs. This is very nice and all. But sometimes we just want it back, and here is how.

First, create a new file called Startup.cs at the root of your project with the following content - don't forget the namespace.

public class Startup
{
    readonly IConfiguration configuration;

    public Startup(IConfiguration configuration)
    {
        this.configuration = configuration ?? throw new ArgumentNullException(nameof(configuration));
    }

    public void ConfigureServices(IServiceCollection services)
    {
    	services.AddControllers();
    }

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        app.UseRouting();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapDefaultControllerRoute();
        });
    }
}

Then at Program.cs change to the following.

//add necessary usings

var builder = WebApplication.CreateBuilder(args);

//create new instance of Startup
var startup = new Startup(builder.Configuration);

//configure all services
startup.ConfigureServices(builder.Services);

var app = builder.Build();

//configure the pipeline
startup.Configure(app, builder.Environment);

//run
app.Run();

The simpler the solution the better!

That is all folks.
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