计算网格视图购物车的总价格 [英] Calculate Total Price for grid view cart

问题描述

我有这个网格视图表。

Hi, I have this grid view table.

<asp:GridView ID="gv_CartProduct" runat="server" AutoGenerateColumns="False">
       <Columns>
           <asp:BoundField DataField="title" HeaderText="Product:"/>
           <asp:TemplateField HeaderText="Quantity">
           <ItemTemplate>
               <asp:TextBox ID="tb_quantity" runat="server" DataField="qty" Text='<%# Eval("qty") %>' ></asp:TextBox>
           </ItemTemplate>
            </asp:TemplateField>
           <asp:BoundField DataField="price" HeaderText="Price" />
       </Columns>
   </asp:GridView>

我想通过乘以数量和价格来计算价格。但它一直给我带来问题。我不断收到此错误消息：

I wanted to calculate the price by multiplying quantity and price. But it has been giving me problem. I keep getting this error message:

Message "Input string was not in a correct format." string

这是我使用的代码计算总价：

This is the code I use the calculate the total price:

protected void CalculateCartSums()
       {
           int amount = 0;
           int qty = 0;
           int rowTotal = 0;
           int subTotal = 0;
           int total = 0;

           foreach (GridViewRow row in gv_CartProduct.Rows)
           {
               qty = Convert.ToInt32(row.Cells[1].Text);
               amount = Convert.ToInt32(row.Cells[2].Text);
               rowTotal = qty * amount;
               subTotal += rowTotal;
           }
           total = subTotal;
           lblPriceTotal.Text = Convert.ToString(total);

       }

非常感谢。谢谢

Much appreciated. Thank You

推荐答案

数量是一个 TextBox ，它在 TemplateField 里面。



你必须得到它...

Quantity is a TextBox, which is inside the TemplateField.

You have to get it like...

TextBox txtQuantity = (TextBox)row.FindControl("tb_quantity");
qty = Convert.ToInt32(txtQuantity.Text);

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