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You can obtain the hostBuilderContext in ASP.NET Core 7 by using the following code:

using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Builder;
using Microsoft.Extensions.Hosting;

public class MyStartup
{
    public MyStartup(IHostEnvironment env)
    {
        // Access the HostBuilderContext via the environment
        var context = env as IHostBuilderContext;

        // Do something with the context...
    }

    public void ConfigureServices(IServiceCollection services)
    {
        // Configure services here...
    }

    public void Configure(IApplicationBuilder app)
    {
        // Configure the app here...
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        var builder = WebApplication.CreateBuilder(args);
        builder.Services.AddSingleton<MyStartup>();

        var app = builder.Build();
        app.Services.GetService<MyStartup>();

        app.Run();
    }
}

In this example, we create a new instance of the MyStartup class and pass it as a singleton service to the application's service collection. Later, we obtain the instance of MyStartup from the service collection, which allows us to access the HostBuilderContext.