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)

    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)

        app.UseEndpoints(endpoints =>

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

var app = builder.Build();

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


The simpler the solution the better!

That is all folks.
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