对购物车的怀疑 [英] Doubt for shopping cart

问题描述

朋友们，我正在制作一个应用程序，用于构建购物车.
用户将选择产品，然后单击添加到购物车"按钮.该产品将被添加到购物车.详细信息将从detailview发送，我直接从数据库中显示产品的详细信息.
用于将详细信息发送到购物车的代码是

Hi friends i am making an application in which i am building a shopping cart.
User will select the product and click on "Add to cart" button.The product will be added to shopping cart.Details will be send from a detailview in which i am showing the details of the product directly from the database.
The code for sending the details to the shopping cart is

DetailsViewRow dr1 = (DetailsViewRow)((Button)sender).Parent.Parent;
        string name = ((Label)dr1.FindControl("Label3")).Text;
        string price = ((Label)dr1.FindControl("Label2")).Text;
        string id = ((Label)dr1.FindControl("Label4")).Text;
        string quantity = ((TextBox)dr1.FindControl("txtQuantity")).Text;
        LineItem item1 = new LineItem(int.Parse(id), name, double.Parse(price), int.Parse(quantity));
        Invoice ord1 = (Invoice)Session["basket"];
        ord1.AddItem(item1);

        Server.Transfer("ShoppingCart.aspx");

但我遇到错误

无法将类型为"System.Web.UI.HtmlControls.HtmlForm"的对象转换为类型为"System.Web.UI.WebControls.DetailsViewRow".

我试图解决它，但是没有运气.
谁能帮我

but i am getting an error

Unable to cast object of type ''System.Web.UI.HtmlControls.HtmlForm'' to type ''System.Web.UI.WebControls.DetailsViewRow''.

I tried to solve it but with no luck.
Can any one help me

推荐答案

您调试了吗?如果有的话，您会清楚地看到这是问题所在.

Have you debugged? If you had you would clearly see this is the problem.

DetailsViewRow dr1 = (DetailsViewRow)((Button)sender).Parent.Parent;

显然，按钮的父级的父级不是DetailsViewRow.

Obviously, the parent of the parent of the button is not a DetailsViewRow.

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