在转发器控件中查找列的小计

Question

我无法找到转发器控件中 "price" 列的小计。它不计算小计。提前致谢！

这是转发器的标记：

<asp:Repeater ID="rptItem" runat="server" OnItemCommand="rptItem_ItemCommand" OnItemDataBound="rptItem_ItemDataBound">
        <HeaderTemplate>
            <table id="carttable">
        </HeaderTemplate>
        <ItemTemplate>
            <tr>
                <td>
                    <asp:Button ID="btnDelete" runat="server" Text="Delete" CommandName="delete" CommandArgument='<%# Eval("ProductId") %>' /></td>
                <td>
                    <asp:Image ID="Image1" runat="server" ImageUrl='<%# Eval("ImageUrl") %>' CssClass="imagecart" /></td>
                <td>
                    <asp:HyperLink ID="HyperLink1" runat="server" Text='<%# Eval("ProductName") %>' NavigateUrl='<%# String.Concat("ProductDetails.aspx?ProductId=", Eval("ProductId")) %>'></asp:HyperLink></td>
                <td>
                    <asp:Label ID="Label1" runat="server" Text='<%# String.Format("{0:C}", Eval("Price")) %>'></asp:Label></td>
                <td>
                    <asp:TextBox ID="txtQty" runat="server" Width="50"></asp:TextBox><asp:Button ID="btnUpdate" runat="server" Text="update" /></td>
            </tr>
        </ItemTemplate>
        <FooterTemplate>
            </table>
            Subtotal:
            <asp:Label ID="lblSubtotal" runat="server" Text="Label"></asp:Label>
        </FooterTemplate>
    </asp:Repeater>

下面是代码：

protected void rptItem_ItemCommand(object source, RepeaterCommandEventArgs e)
    {
        if (e.CommandName == "delete")
        {
            List<Item> items = Session["Cart"] as List<Item>;

            var productId = Convert.ToInt32(e.CommandArgument);
            var itemToDelete = (from Item i in items
                                where i.ProductId == productId
                                select i).FirstOrDefault();

            items.Remove(itemToDelete);
            Session["Cart"] = items;
        }

        BindData();
    }

    protected void rptItem_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        double subtotal = 0;
        double price = 0;

        if (e.Item.ItemType == ListItemType.Item)
        {
            price += Convert.ToDouble(DataBinder.Eval(e.Item.DataItem, "Price"));
            subtotal += price;
        }

        if (e.Item.ItemType == ListItemType.Footer)
        {
            Label lblSubtotal = (Label)e.Item.FindControl("lblSubtotal");
            lblSubtotal.Text = subtotal.ToString();
        }
    }

Answer 1

在 ItemDataBound 事件之外声明变量。您的代码的问题是 ItemDataBound 事件在每一行绑定到转发器控件后被调用，所以每次您的 subtotal & price 都被初始化为 0 因此您没有得到预期的输出。

double subtotal = 0;
double price = 0;

protected void rptItem_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item)
    {
        price += Convert.ToDouble(DataBinder.Eval(e.Item.DataItem, "Price"));
        subtotal += price;
    }

    if (e.Item.ItemType == ListItemType.Footer)
    {
        Label lblSubtotal = (Label)e.Item.FindControl("lblSubtotal");
        lblSubtotal.Text = subtotal.ToString();
    }
}

在转发器控件中查找列的小计

Finding subtotal for column in repeater control

.net

c#

asp.net

repeater

databound