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我需要创建一个循环，以便当我尝试从购物车中得出小计时，它会继续检查购物车中是否有更多商品。我的购物车此时是一个列表框。我已经将我的小数声明为单价，以便从我的访问表中提取数据。我还需要加上运费（每件 2 美元）、税金（@ 7%），最后合计一下。我是一个完整的新手，任何帮助将不胜感激。我在 Visual Studio 2010 中使用 c# 和 asp.net 的组合。来自购物车页面的 C# 代码

public partial class _Default : System.Web.UI.Page
{
    private CartItemList cart;

    protected void Page_Load(object sender, EventArgs e)
    {
        cart = CartItemList.GetCart();
        if (!IsPostBack)
            this.DisplayCart();
    }

    private void DisplayCart()
    {
        lstBox.Items.Clear();
        CartItem item;
        for (int i = 0; i < cart.Count; i++)
        {
            item = cart[i];
            lstBox.Items.Add(item.Display());
        }
    }

    protected void clrBtn_Click(object sender, EventArgs e)
    {
        if (cart.Count > 0)
        {
            cart.Clear();
            lstBox.Items.Clear();
        }
    }

    protected void  rmvBtn_Click(object sender, EventArgs e)
    {
        if (cart.Count > 0)
        {
            if (lstBox.SelectedIndex > -1)
            {
                cart.RemoveAt(lstBox.SelectedIndex);
                this.DisplayCart();
            }
            else
            {
                lblMessage.Text = "Please select the item you want to remove.";
            }
        }
    }

    protected void checkoutBtn_Click(object sender, EventArgs e)
    {

    }
}

C#中订单页面的代码

public partial class _Default : System.Web.UI.Page
{
    private Product selectedProduct;

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
            ddlproducts.DataBind();

        selectedProduct = this.GetSelectedProduct();
        lblName.Text = selectedProduct.Name;
        lblShortDescription.Text = selectedProduct.ShortDescription;
        lblLongDescription.Text = selectedProduct.LongDescription;
        lblUnitPrice.Text = selectedProduct.UnitPrice.ToString("c");
    }

    private Product GetSelectedProduct()
    {
        DataView BooksTable = (DataView)
        AccessDataSource2.Select(DataSourceSelectArguments.Empty);
        BooksTable.RowFilter =
            "ProductID = '" + ddlproducts.SelectedValue + "'";
        DataRowView row = (DataRowView)BooksTable[0];

        Product p = new Product();
        p.ProductID = row["ProductID"].ToString();
        p.Name = row["Name"].ToString();
        p.ShortDescription = row["ShortDescription"].ToString();
        p.LongDescription = row["LongDescription"].ToString();
        p.UnitPrice = (decimal)row["UnitPrice"];
        //p.ImageFile = row["Image File"].ToString();
        return p;
    }

    protected void addBtn_Click(object sender, EventArgs e)
    {
        if (Page.IsValid)
        {
            CartItemList cart = CartItemList.GetCart();
            CartItem cartItem = cart[selectedProduct.ProductID];
            if (cartItem == null)
            {
                cart.AddItem(selectedProduct, 1);
            }
            else
            {
                cartItem.AddQuantity(1);
            }
            Response.Redirect("Cart.aspx");
        }
    }
}

c#中的caritemlist代码（顺便说一句，我从我的书中复制了所有这些代码。我不知道如何编程。）

public class CartItemList
{
    private List<CartItem> cartItems;

    public CartItemList()
    {
        cartItems = new List<CartItem>();
    }

    public int Count {
        get { return cartItems.Count; }
    }

    public CartItem this[int index]
    {
        get { return cartItems[index]; }
        set { cartItems[index] = value; }
    }

    public CartItem this[string id]
    {
        get {
            foreach (CartItem c in cartItems)
                if (c.Product.ProductID == id) return c;
            return null;
        }
    }

    public static CartItemList GetCart()
    {
        CartItemList cart = (CartItemList) HttpContext.Current.Session["Cart"];
        if (cart == null)
            HttpContext.Current.Session["Cart"] = new CartItemList();
        return (CartItemList) HttpContext.Current.Session["Cart"];
    }

    public void AddItem(Product product, int quantity)
    {
        CartItem c = new CartItem(product, quantity);
        cartItems.Add(c);
    }

    public void RemoveAt(int index)
    {
        cartItems.RemoveAt(index);
    }

    public void Clear()
    {
        cartItems.Clear();
    }
}
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1 回答 1

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根据我的理解，您想从购物车中一一获取所有商品并希望返回购物车的总价格。这是你想要的吗 -

double total = 0;
foreach(CartItem cartItem in CartItemList.GetCart())
{
   total+= cartItem.Price * cartItem.Quantity
}
于 2012-10-27T14:45:16.280 回答