// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
 
// HostingStartup's in the primary assembly are run automatically.
[assembly: HostingStartup(typeof(SampleStartups.StartupInjection))]
 
namespace SampleStartups;
 
public class StartupInjection : IHostingStartup
{
    public void Configure(IWebHostBuilder builder)
    {
        builder.UseStartup<InjectedStartup>();
    }
 
    // Entry point for the application.
    public static Task Main(string[] args)
    {
        var host = new HostBuilder()
            .ConfigureWebHost(webHostBuilder =>
            {
                webHostBuilder
                    .UseKestrel()
                    // Each of these three sets ApplicationName to the current assembly, which is needed in order to
                    // scan the assembly for HostingStartupAttributes.
                    // .UseSetting(WebHostDefaults.ApplicationKey, "SampleStartups")
                    // .Configure(_ => { })
                    .UseStartup<NormalStartup>();
            })
            .Build();
 
        return host.RunAsync();
    }
}
 
public class NormalStartup
{
    public void ConfigureServices(IServiceCollection services)
    {
        Console.WriteLine("NormalStartup.ConfigureServices");
    }
 
    public void Configure(IApplicationBuilder app)
    {
        Console.WriteLine("NormalStartup.Configure");
        app.Run(async (context) =>
        {
            await context.Response.WriteAsync("Hello World!");
        });
    }
}
 
public class InjectedStartup
{
    public void ConfigureServices(IServiceCollection services)
    {
        Console.WriteLine("InjectedStartup.ConfigureServices");
    }
 
    public void Configure(IApplicationBuilder app)
    {
        Console.WriteLine("InjectedStartup.Configure");
        app.Run(async (context) =>
        {
            await context.Response.WriteAsync("Hello World!");
        });
    }
}