在ItemTemplate中的控件不能在code被称为背后 [英] Controls in ItemTemplate can't be called in Code Behind
问题描述
我有服务器控件，如与另一个GridView控件模板字段里面的GridView弹出：
I have server controls such as a popup with a gridview inside template fields in another gridview:
<asp:TemplateField HeaderText="Actions">
<ItemTemplate>
<asp:Button ID="viewHoursButton" runat="server" Text="View Hours" OnClick="viewHoursButton_OnClick" />
<ajaxToolkit:ModalPopupExtender ID="viewHoursPopup" runat="server"
TargetControlID="viewHoursButton"
PopupControlID="viewHoursPanel"
CancelControlID="closeInfoPanelButton2"
DropShadow="true">
</ajaxToolkit:ModalPopupExtender>
<asp:Panel ID="viewHoursPanel" runat="server" CssClass="infoPanel">
<asp:Button ID="closeInfoPanelButton2" runat="server" Text="X" CssClass="closeInfoPanelButton" />
<asp:Label ID="viewHoursLabel" runat="server" Text="Label"></asp:Label>
<asp:GridView ID="viewHoursGridView" runat="server" AllowPaging="True" AutoGenerateColumns="False"
DataSourceID="SqlDataSource6" DataKeyNames="NonScrumStoryId,PK_DailyTaskHours"
BackColor="#DEBA84" BorderColor="#DEBA84" BorderStyle="None" BorderWidth="1px"
CellPadding="3" CellSpacing="2" Width="94%" OnRowDeleting="viewHoursGridView_OnRowDeleting"
OnRowDataBound="viewHoursGridView_OnRowDataBound" CssClass="centerGridView">
<Columns>
<asp:BoundField DataField="ActivityDate" HeaderText="Activity Date" SortExpression="ActivityDate"
DataFormatString="{0:MM/dd/yyyy}" />
<asp:BoundField DataField="Hours" HeaderText="Hours" SortExpression="Hours" />
<asp:BoundField DataField="Notes" HeaderText="Notes" SortExpression="Notes" />
<asp:BoundField DataField="CreateDate" HeaderText="Created Date" SortExpression="CreateDate"
Visible="false" />
<asp:CommandField ShowDeleteButton="True" />
</Columns>
<FooterStyle BackColor="#F7DFB5" ForeColor="#8C4510" />
<HeaderStyle BackColor="#7fc041" Font-Bold="True" ForeColor="White" />
<PagerStyle ForeColor="#8C4510" HorizontalAlign="Center" />
<RowStyle BackColor="#FFF7E7" ForeColor="#8C4510" />
<SortedAscendingCellStyle BackColor="#FFF1D4" />
<SortedAscendingHeaderStyle BackColor="#B95C30" />
<SortedDescendingCellStyle BackColor="#F1E5CE" />
<SortedDescendingHeaderStyle BackColor="#93451F" />
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource6" runat="server" ConnectionString="<%$ ConnectionStrings:ApplicationServices %>"
SelectCommand="
SELECT [DailyTaskHours].[PK_DailyTaskHours]
,[DailyTaskHours].[NonScrumStoryId]
,[DailyTaskHours].[Hours]
,[DailyTaskHours].[Notes]
,[DailyTaskHours].[ActivityDate]
,[DailyTaskHours].[CreateDate]
FROM [NonScrumStory]
,[DailyTaskHours]
WHERE [DailyTaskHours].[NonScrumStoryId] = @nonScrumStoryId
AND [NonScrumStory].[PK_NonScrumStory] = @nonScrumStoryId
ORDER BY [ActivityDate] DESC
"
DeleteCommand="
DELETE
FROM [DailyTaskHours]
WHERE ([PK_DailyTaskHours] = @setDailyPKDeleteParam)
">
<SelectParameters>
<asp:QueryStringParameter Name="nonScrumStoryId" Type="String" />
</SelectParameters>
<DeleteParameters>
<asp:QueryStringParameter Name="setDailyPKDeleteParam" Type="Int32" />
</DeleteParameters>
</asp:SqlDataSource>
</asp:Panel>
<asp:Button ID="addHoursButton" runat="server" Text="Add Hours" OnClick="addHoursButton_OnClick" />
<asp:Button ID="editButton" runat="server" Text="Edit" OnClick="editButton_OnClick" />
<asp:Button ID="deleteButton" runat="server" Text="Delete" OnClick="deleteButton_OnClick" />
</ItemTemplate>
</asp:TemplateField>
我不能移动出来GridView的，因为它是必要的调用弹出才能正常工作。
I cant move them out of the gridview because it is necessary for the call to the popup to work correctly.
不过我的code后面不能识别一些的ItemTemplate内编号的：
However my code behind is not recognizing some of the ID's within the ItemTemplate:
protected void viewHoursButton_OnClick(object sender, EventArgs e)
{
viewHoursPopup.Show();
viewHoursGridView.DataBind();
}
例如，在_OnClick方法的工作，即使按钮是里面的ItemTemplate但两个方法调用无法识别：
For example, the _OnClick method work even though the button is inside the ItemTemplate but the two method calls are not recognized:
我该如何解决这个问题？
How do I fix this issue?
推荐答案
使用的FindControl（）方法，但它们转换成您所使用的更具体的类型的ItemTemplate 声明的标记，像这样的：
Use the FindControl() method, but cast them to the more specific type you are using in the ItemTemplate declaration of your markup, like this:
protected void viewHoursButton_OnClick(object sender, EventArgs e)
{
var viewHoursPopup = parentGridView.FindControl("viewHoursPopup") as ModalPopupExtender;
var viewHoursGridView = parentGridView.FindControl("viewHoursGridView") as GridView;
if (viewHoursPopup != null && viewHoursGriView != null)
{
viewHoursPopup.Show();
viewHoursGridView.DataBind();
}
}
请注意：的FindControl（）返回控制，这是过于笼统的对象调用 .Show（）方法。在为运算符将返回空如果不能成功完成中投，所以在检查空很快就会追上这种情况。
Note: FindControl() returns a Control, which is too general of an object to call the .Show() method. The as operator will return null if the cast cannot be successfully performed, so the check for null later will catch that scenario.
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