Question

在gridview内部有一个下拉列表

<asp:TemplateField HeaderText="Quantity">
    <ItemTemplate>
        <asp:DropDownList ID="quantity" runat="server" DataValueField="ItemID" DataTextField="Quantity">
        </asp:DropDownList>
    </ItemTemplate>
</asp:TemplateField>

对于每个itemid，数据库表的Quantity字段中有一些数值我希望此下拉列表必须包含购物车中所有商品的值from 1 to quantity.DataTextField

gridview绑定的过程是

create proc [dbo].[prcItemsinCart](@CartID int)
as
    select distinct ct.Price,ct.Quantity,ct.ItemID,
           ct.CartID,ct.ProductID,p.ProductName,
           isnull((  select top 1 convert(varchar,PhotoID,10) + '.' + ExtName
                 from ProductPhoto 
                 where ProductID = ct.ProductID ),'NoImage.jpg'
           ) as Product, 
           ( Select Price*Quantity 
             from CartItems 
             where CartID=ct.CartID and ProductID=ct.ProductID
           ) as SubTotal
    from CartItems as ct 
    inner join ProductInfo as p on ct.ProductID=p.ProductID 
    inner join ProductPhoto as pp on ct.ProductID=pp.ProductID 
    where ct.CartID=@CartID

Answer 1

我会在HiddenField中添加TemplateField来保存CartID，我会在代码中使用CartID。我的标记应该如下：

<asp:TemplateField HeaderText="Quantity">
    <ItemTemplate>  
        <asp:HiddenField ID="hdnId" runat="server" value='<%#Eval("CartID") %>'></asp:HiddenField>                            
        <asp:DropDownList ID="quantity" runat="server" DataValueField="ItemID" DataTextField="Quantity">
        </asp:DropDownList>
    </ItemTemplate>
</asp:TemplateField>

在代码中，在GridView的RowDataBound中，我找到了DropDownList和HiddenField，运行了一个Sql Query来获取我的预期数据，并将它们绑定到我的DropdownList：

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    if (e.Row.RowType == DataControlRowType.DataRow)
    {
        DropDownList quantity = e.Row.FindControl("quantity") as DropDownList;
        HiddenField hdnId = e.Row.FindControl("hdnId") as HiddenField;

        if (quantity != null && hdnId != null)
        {
            string queryString = String.Format("SELECT ItemID, Quantity FROM  CartItems  WHERE CartID= {0}", hdnId.Value);

            //MyConnectionString is your connection string in web.config
            using (SqlConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["MyConnectionString"].ToString()))
            {
                SqlCommand command = new SqlCommand(queryString, connection);
                connection.Open();
                SqlDataReader reader = command.ExecuteReader();
                quantity.DataSource = reader;
                quantity.DataValueField = "ItemID";
                quantity.DataTextField = "Quantity";
                quantity.DataBind();               
            }
        }        

    }
}

如何在网格视图中限制的下拉列表中获取值？

1 个答案: