C#: How do Minimal APIs differ from controllers in ASP.NET Core?

1var api = app.MapGroup("/api")
2    .AddEndpointFilter<ValidationFilter>()
3    .RequireAuthorization();
4
5api.MapPost("/orders", async (CreateOrderDto dto, IOrderService svc) =>
6{
7    var order = await svc.CreateAsync(dto);
8    return Results.Created($"/orders/{order.Id}", order);
9})
10.WithName("CreateOrder")
11.WithTags("Orders");

1public class ValidationFilter : IEndpointFilter
2{
3    public async ValueTask<object?> InvokeAsync(
4        EndpointFilterInvocationContext ctx,
5        EndpointFilterDelegate next)
6    {
7        var validator = ctx.HttpContext.RequestServices
8            .GetRequiredService<IValidator<T>>();
9        var result = await validator.ValidateAsync(input);
10        if (!result.IsValid)
11            return Results.ValidationProblem(result.ToDictionary());
12        return await next(ctx);
13    }
14}