Csharp 如何使用IHostedService添加数据种子方法

这是我的Program.cs美元

var builder = WebApplication.CreateBuilder(args);
builder.Services.AddControllers();
builder.Services.AddTransient<DatabaseSeeder>();
builder.Services.AddScoped<IWeatherForecastService, WeatherForecastService>();
builder.Services.AddDbContext<RestaurantDbContext>();

var app = builder.Build();

using (var scope = app.Services.CreateScope())
{       
    var serviceProvider = scope.ServiceProvider;
    var databaseSeeder = serviceProvider.GetRequiredService<DatabaseSeeder>();

    try
    {
        await databaseSeeder.SeedDatabaseAsync();
        Console.WriteLine("Seed is up.");
    }
//...
}

这是DatabaseSeeder.cs

public class DatabaseSeeder
{
    private readonly RestaurantDbContext _context;
    public DatabaseSeeder(RestaurantDbContext context);
    public async Task SeedDatabaseAsync()
    {
         _context.Restaurants.AddRange(GetRestaurants());
        await _context.SaveChangesAsync();
    }
    public IEnumerable<Restaurant> GetRestaurants()
    {
        IEnumerable<Restaurant> restaurants = new List<Restaurant>()
        {
            // here some samples
        };
        return restaurants;
    }
}

那么，我如何才能将我的Program.cs代码更改为使用IHostedService作为数据种子呢？

我不明白什么是IHostedService，也找不到好的来源来阅读它.