如何在MVC控制器外部返回StatusCode对象

public class CustomService
{
    private readonly IHttpContextAccessor _httpContextAccessor;

    public CustomService(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

    public void SetStatusCode(int statusCode)
    {
        _httpContextAccessor.HttpContext.Response.StatusCode = statusCode;
    }
}

public void ConfigureServices(IServiceCollection services)
{
    services.AddHttpContextAccessor();
    services.AddScoped<CustomService>();
    // 其他服务注册...
}

public class MyController : Controller
{
    private readonly CustomService _customService;

    public MyController(CustomService customService)
    {
        _customService = customService;
    }

    public IActionResult Index()
    {
        // 模拟一些业务逻辑
        bool isSuccess = false; // 假设业务逻辑失败

        if (!isSuccess)
        {
            _customService.SetStatusCode(400); // 设置状态码为400 Bad Request
        }

        return View();
    }
}