将计算列添加到GridView

public class Product
{
    public int Id { get; set; }
    public decimal Price { get; set; }
    public int Quantity { get; set; }
}

<asp:GridView ID="gvProducts" runat="server" AutoGenerateColumns="false" OnRowDataBound="gvProducts_RowDataBound">
    <Columns>
        <asp:BoundField DataField="Id" HeaderText="ID" />
        <asp:BoundField DataField="Price" HeaderText="Price" />
        <asp:BoundField DataField="Quantity" HeaderText="Quantity" />
        <asp:TemplateField HeaderText="Total">
            <ItemTemplate>
                <asp:Label ID="lblTotal" runat="server"></asp:Label>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

protected void gvProducts_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        Product product = (Product)e.Row.DataItem;
        decimal total = product.Price * product.Quantity;

        Label lblTotal = (Label)e.Row.FindControl("lblTotal");
        lblTotal.Text = total.ToString("C");
    }
}