选项卡内部的Accordions分别为// bootstrap

Question

尝试按标签设置手风琴。使用我的代码会发生一些毛刺（如下所示）。

1）第一个标签中的数据出现但是如果我切换到另一个标签，然后回到第一个标签，则它不显示正确的手风琴。

2）第四个标签甚至没有显示其手风琴

public ActionResult AddToCart(int productId)
{
    // get a cart from session or create new
    var cart = Session["cart"] as List<CartVM> ?? new List<CartVM>();

    using(var db = new Db())
    {
        // get product in question
        var product = db.Products
            .FirstOrDefault(x => x.Id == productId)

        // if this is unknown product, throw exception
        if(product == null)
        {
            thrown new ArgumentException("Invalid product", nameof(productId));
        }

        // get existing line
        var existingCartLine = cart
            .FirstOrDefault(x => x.ProductId == productId);

        // if there was no existing line, add a new one
        if(existingCartLine == null)
        {
            cart.Add(new CartVM
            {
                ProductId = product.Id,
                Quantity = 1,
                Price = product.Price,
                TotalPrice = product.Price
            });
        }
        else
        {
            // otherwise modify existing line
            existingCartLine.Quantity++;
            existingCartLine.TotalPrice = cartLine.Price * cartLine.Quantity;
        }
    }

    // save cart back in the session
    Session["cart"] = cart;

    // return view
    return PartialView(cart);
}