关于gridview 自定列不能读取数值的问题

在gridview1，自定义textbox列，在输入数值后，通过按钮保存其数值，但通过
Dim t As TextBox = CType(GridView1.Rows(i).FindControl("txtOnePrice"), TextBox)获取的数值，都是空值，不知道什么原因，从昨晚折腾到现在了，请老鸟指点，感激不尽！！！

<%@ Page Language="vb" EnableViewState="true" AutoEventWireup="false" MasterPageFile="~/Site1.Master" CodeBehind="wydc.aspx.vb" Inherits="Web.wydc"
  title="在线订餐" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" runat="server">
  <asp:Panel ID="Panel2" runat="server" Visible="False">
  <asp:Calendar ID="Calendar1" runat="server" BackColor="#FFFFCC"
  BorderColor="#FFCC66" BorderWidth="1px" DayNameFormat="Shortest"
  Font-Names="Verdana" Font-Size="8pt" ForeColor="#663399" Height="200px"
  ShowGridLines="True" Width="220px">
  <SelectedDayStyle BackColor="#CCCCFF" Font-Bold="True" />
  <SelectorStyle BackColor="#FFCC66" />
  <TodayDayStyle BackColor="#FFCC66" ForeColor="White" />
  <OtherMonthDayStyle ForeColor="#CC9966" />
  <NextPrevStyle Font-Size="9pt" ForeColor="#FFFFCC" />
  <DayHeaderStyle BackColor="#FFCC66" Font-Bold="True" Height="1px" />
  <TitleStyle BackColor="#990000" Font-Bold="True" Font-Size="9pt"
  ForeColor="#FFFFCC" />
  </asp:Calendar>
  <asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False"
  BackColor="White" BorderColor="#999999"
  BorderStyle="None" BorderWidth="1px" CellPadding="3" GridLines="Vertical">
  <RowStyle BackColor="#EEEEEE" ForeColor="Black" />
  <Columns>
  <asp:BoundField DataField="餐次名称" FooterText="预定餐次" HeaderText="预定餐次" />
  <asp:BoundField DataField="开始时间" FooterText="开始时间" HeaderText="开始时间" />
  <asp:BoundField DataField="结束时间" FooterText="结束时间" HeaderText="结束时间" />
  <asp:BoundField DataField="订餐份数" FooterText="已订份数" HeaderText="已订份数" />
  <asp:TemplateField FooterText="订餐份数" HeaderText="订餐份数">
  <ItemTemplate>
  <asp:TextBox ID="txtOnePrice" runat="server" Height="21px" Width="75px"
  ></asp:TextBox>
  </ItemTemplate>
  </asp:TemplateField>
  <asp:ButtonField FooterText="订餐" HeaderText="订餐" Text="订餐" />
  </Columns>
  <FooterStyle BackColor="#CCCCCC" ForeColor="Black" />
  <PagerStyle BackColor="#999999" ForeColor="Black" HorizontalAlign="Center" />
  <SelectedRowStyle BackColor="#008A8C" Font-Bold="True" ForeColor="White" />
  <HeaderStyle BackColor="#000084" Font-Bold="True" ForeColor="White" />
  <AlternatingRowStyle BackColor="Gainsboro" />
  </asp:GridView>

  <asp:Button ID="Button2" runat="server" Text="保存订餐信息" />
  </asp:Panel>
</asp:Content>

以下是vb代码

Public Partial Class wydc
  Inherits System.Web.UI.Page
  Public dtcc As New DataTable
  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
  If Session("loginuserbh") <> "" Then
  Panel2.Visible = True
  Dim xfs As New Service1 ' 这是个webservice
  dtcc = xfs.select_canci(Session("loginuserbh"), IIf(Format(Calendar1.SelectedDate, "yyyy-MM-dd") = "0001-01-01", Date.Now, Format(Calendar1.SelectedDate, "yyyy-MM-dd")))
  GridView1.DataSource = dtcc
  GridView1.DataBind()
  End If
  End Sub

  Protected Sub Button2_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button2.Click
  For i = 0 To dtcc.Rows.Count - 1
  dtcc.Rows(i).Item("编号") = Session("loginuserbh")
  dtcc.Rows(i).Item("姓名") = Session("loginuserxm")
  dtcc.Rows(i).Item("订餐日期") = IIf(Format(Calendar1.SelectedDate, "yyyy-MM-dd") = "0001-01-01", Date.Now, Format(Calendar1.SelectedDate, "yyyy-MM-dd"))
  Dim t As TextBox = CType(GridView1.Rows(i).FindControl("txtOnePrice"), TextBox)
  dtcc.Rows(i).Item("订餐份数") = t.Text '这里一直显示的是空值
  Next
  Dim xfs As New Service1
  xfs.dc(dtcc)
  End Sub

  Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewCommandEventArgs) Handles GridView1.RowCommand
  Dim index As Integer = Convert.ToInt32(e.CommandArgument)
  Dim t As TextBox = CType(GridView1.Rows(index).FindControl("txtOnePrice"), TextBox)
  dtcc.Rows(index).Item("订餐份数") = t.Text
  End Sub
End Class --------------------编程问答-------------------- 自定义列是你那样的吗？

参考：



<asp:TemplateField HeaderText="编号">

    <ItemTemplate>

        <asp:TextBox ID="txtOnePrice" runat="server" Height="21px" Width="75px" />

    </ItemTemplate>

</asp:TemplateField>

--------------------编程问答-------------------- 对不起，看错了，你那样是对的。。。。

--------------------编程问答-------------------- 是因为数据绑定的原因么，那一列没绑定，还有在textbox_TextChanged事件里里面没有任何反应 --------------------编程问答--------------------

引用 3 楼的回复:

是因为数据绑定的原因么，那一列没绑定，还有在textbox_TextChanged事件里里面没有任何反应

运行后的页面代码，看看textbox在不在页面里 --------------------编程问答-------------------- 怎么看？ --------------------编程问答-------------------- 先跟踪一下看看FindControl有没有找到哪个textbox。 --------------------编程问答-------------------- 问题解决了，在Page_Load时数据又被重新加载了

补充：.NET技术 ,  ASP.NET