無法從代碼隱藏中找到控件，但能夠找到其他控件

Question

我能夠找到所有這些標籤和文本框的控件接受edateTB。這對我來說很奇怪，因爲它與sdateTB的觀點相同。那麼爲什麼當我嘗試使用FindControl並且sdateTB返回正確的控件時，edateTB會返回NULL？

在此先感謝，這一直讓我感到沮喪。

這裏是我得到這個錯誤的代碼隱藏。在這裏有更多的代碼，但我只是想我會包括一切，直到我得到NULL錯誤的部分。

protected void ReservationDetail_DataBound(object sender, EventArgs e) 
{ 


    TextBox idBox = (TextBox)dvReservationDetail.FindControl("tbID"); 
    int id = int.Parse(idBox.Text); 
    Label specDays = (Label)dvReservationDetail.FindControl("DaysHdr"); 
    Label weekdays = (Label)dvReservationDetail.FindControl("WeekdaysHdr"); 
    ListBox dates = (ListBox)dvReservationDetail.FindControl("DatesList"); 
    Label days = (Label)dvReservationDetail.FindControl("WeekdaysLbl"); 
    Label sdate = (Label)dvReservationDetail.FindControl("startDateLbl"); 
    TextBox sdateTb= (TextBox)dvReservationDetail.FindControl("startDateTB"); 
    Label eDate = (Label)dvReservationDetail.FindControl("endDateLbl"); 
    TextBox edateTB = (TextBox)dvReservationDetail.FindControl("endDateTB"); 
} 

這裏是DetailsView標籤和文本框的位置。

<asp:DetailsView ID="dvReservationDetail" runat="server" DataSourceID="SqlDetail" 
        OnDataBound="ReservationDetail_DataBound" CssClass="detailgrid" GridLines="None" 
        DefaultMode="Edit" AutoGenerateRows="false" Visible="false" Width="100%" OnItemUpdating="ReservationDetail_Updating"> 
        <Fields> 
         <asp:TemplateField HeaderText="ID"> 
          <EditItemTemplate> 
           <asp:TextBox ID="tbID" runat="server" Text='<%# Bind("id") %>' ReadOnly="true" /> 
          </EditItemTemplate> 
         </asp:TemplateField> 
         <asp:BoundField HeaderText="LabName" DataField="labName" /> 
         <asp:BoundField HeaderText="Class" DataField="class" /> 
         <asp:BoundField HeaderText="Class Size" DataField="classSize" /> 
         <asp:TemplateField HeaderText="Software"> 
          <EditItemTemplate> 
           <asp:ListBox ID="software" Width="150" runat="server" ReadOnly="true" /> 
          </EditItemTemplate> 
         </asp:TemplateField> 
         <asp:TemplateField HeaderText="Start Time"> 
          <EditItemTemplate> 
           <asp:TextBox ID="startTime" runat="server" Text='<%# Bind("startTime") %>' /> 
          </EditItemTemplate> 
         </asp:TemplateField> 
         <asp:TemplateField HeaderText="End Time"> 
          <EditItemTemplate> 
           <asp:TextBox ID="endTime" runat="server" Text='<%# Bind("endTime") %>' /> 
          </EditItemTemplate> 
         </asp:TemplateField> 
         <asp:TemplateField> 
          <HeaderTemplate> 
           <asp:Label ID="WeekdaysHdr" runat="server" Visible="false" Text="Days Reserved By Week"></asp:Label> 
           <asp:Label ID="DaysHdr" runat="server" Visible="false" Text="Specific Days Reserved"></asp:Label> 
          </HeaderTemplate> 
          <ItemTemplate> 
           <asp:ListBox ID="DatesList" runat="server" Visible="false"></asp:ListBox> 
           <asp:Label ID="WeekdaysLbl" runat="server" Text='<%# Bind("Weekday") %>' Visible="false"></asp:Label> 
          </ItemTemplate> 
         </asp:TemplateField> 
         <asp:TemplateField> 
          <HeaderTemplate> 
           <asp:Label ID="startDateLbl" runat="server" Visible="false" Text="Start Date"></asp:Label></HeaderTemplate> 
          <ItemTemplate> 
           <asp:TextBox ID="startDateTB" runat="server" Visible="false" Text="Test"></asp:TextBox></ItemTemplate> 
         </asp:TemplateField> 
         <asp:TemplateField> 
          <HeaderTemplate> 
           <asp:Label ID="endDateLbl" runat="server" Visible="false" Text="End Date"></asp:Label></HeaderTemplate> 
          <ItemTemplate> 
           <asp:TextBox ID="endDateTB" runat="server" Visible="false" Text=""></asp:TextBox></ItemTemplate> 
          <ItemTemplate> 
           <asp:TextBox ID="repeatTypeTB" runat="server" Visible="false" Text='<%# Bind("repeats") %>'></asp:TextBox></ItemTemplate> 
         </asp:TemplateField> 
         <%-- <asp:CommandField ShowEditButton="true" />--%> 
        </Fields> 
       </asp:DetailsView> 

Answer 1

它看起來像你有2個ItemTemplate中標記你最後一個TemplateField標籤。注意：

<asp:TemplateField> 
    <HeaderTemplate> 
     <asp:Label ID="endDateLbl" runat="server" Visible="false" Text="End Date"></asp:Label></HeaderTemplate> 
    <ItemTemplate> 
     <asp:TextBox ID="endDateTB" runat="server" Visible="false" Text=""></asp:TextBox></ItemTemplate> 
    <ItemTemplate> 
     <asp:TextBox ID="repeatTypeTB" runat="server" Visible="false" Text='<%# Bind("repeats") %>'></asp:TextBox></ItemTemplate> 
</asp:TemplateField> 

有可能第一個包含endDateTB的被忽略。

它應該看起來像：

<asp:TemplateField> 
    <HeaderTemplate> 
     <asp:Label ID="endDateLbl" runat="server" Visible="false" Text="End Date"></asp:Label></HeaderTemplate> 
    <ItemTemplate> 
     <asp:TextBox ID="endDateTB" runat="server" Visible="false" Text=""></asp:TextBox></ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField> 
    <HeaderTemplate> 
     <asp:Label ID="repeatTypeLbl" runat="server" Visible="false" Text="Repeat"></asp:Label></HeaderTemplate> 
    <ItemTemplate> 
     <asp:TextBox ID="repeatTypeTB" runat="server" Visible="false" Text='<%# Bind("repeats") %>'></asp:TextBox></ItemTemplate> 
</asp:TemplateField> 

Answer 2

所有其它線（標籤）dvreservationdetail ...

最後一行（標籤）this.dvreservationdetail ...