并非所有代码路径都为计时器返回值错误

Question

订单控制器

public async Task<ActionResult> FirstClassCreate(FormCollection values)
{
    var order = new Order();
    TryUpdateModel(order);
    var customer = db.Users.FirstOrDefault(x => x.Email == User.Identity.Name);
    var cart = ShoppingCart.GetCart(this.HttpContext);
    try
    {
        //I need to get the order.timeleft to start a count down
        order.timeleft = timer(); 
        //Save Order
        storeDB.Orders.Add(order);
        await storeDB.SaveChangesAsync();
        //Process the order
        cart = ShoppingCart.GetCart(this.HttpContext);
        order.Total = cart.GetFirstClass();
        order = cart.CreateOrder(order);
        return RedirectToAction("FirstClass", "Checkouts");
    }
    catch
    {
        //Invalid - redisplay with errors
        return View(order);
    }
}

我需要计时器每秒减少 1 个，一个时间 = 0 返回计时器左为假，但是我在公共 ActionResult 计时器中遇到问题，突出显示计时器状态为".timer(Order("：并非所有代码路径都返回值

public ActionResult timer(Order order)
{
    int time;
    order.timeleft = true;
    time = 30;
    do
    {
        if (time > 0)
        {

            time = time - 1;
        }
        else
        {
            // If the user ran out of time, stop the timer, set timeleft = false
            var orderToBeChanged = db.Orders
        .Where(o => o.HasPaid == false && o.Email == User.Identity.Name)
              .OrderByDescending((o => o.OrderDate)).First();
            order.timeleft = false;
            db.SaveChanges();

        }
    } while (time > 0);
}

Answer 1

ActionResult 类型的方法必须返回 ActionResult，即

public ActionResult Timer(Order order)
{
    ...
    return myActionResult;
}

或者，如果您不希望它返回任何内容，请将其标记为 void

public void Timer(Order order)
{
    ...
}

Answer 2

在函数public ActionResult timer(Order order)的任何地方，你不返回任何值，在标题中你说这个函数返回类型 ActionResult

在您的情况下，您可以通过以下方式修改timer函数：

public bool timer(Order order)
{
    ...
    } while (time > 0);
    return order.timeleft;
}