爲什麼我無法從代碼隱藏

Question

訪問圖像我已經在GridView如下：

<asp:GridView ShowHeaderWhenEmpty="false" AlternatingRowStyle-BackColor="#EBE9E9" AutoGenerateColumns="false" OnSorting="yourTasksGV_Sorting" AllowSorting="true" ID="yourTasksGV" runat="server" ClientIDMode="Static" EmptyDataText="You currently have no tasks assigned to you" OnRowDataBound="yourTasksGV_RowDataBound" OnRowCreated="yourTasksGV_RowCreated"> 
    <Columns> 
     <asp:TemplateField> 
      <ItemTemplate> 
       <asp:Image ID="imgExpCol" AlternateText="plus" ClientIDMode="Static" ImageUrl="~/theImages/subTaskPlus.png" runat="server" CssClass="imgExpCol" /> 
       <asp:Panel ID="pnlSubTasks" runat="server" CssClass="pnlSubTasks" ClientIDMode="Static"> 
        <asp:GridView ID="gvSubTasks" runat="server" AutoGenerateColumns="false" ClientIDMode="Static"> 
         <Columns> 
          <asp:BoundField DataField="Task Name" HeaderText="Task Name" /> 
          <asp:BoundField DataField="Due Date" HeaderText="Due Date" /> 
         </Columns> 
        </asp:GridView> 
       </asp:Panel> 
      </ItemTemplate> 
     </asp:TemplateField> 
     <asp:HyperLinkField Target="_self" DataNavigateUrlFields="Task Detail" DataTextField="Task Name" DataNavigateUrlFormatString="" HeaderText="Task Detail" SortExpression="Task Name" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:TemplateField> 
      <ItemTemplate> 
       <asp:ImageButton ImageUrl="~/theImages/Dependencies.png" CssClass="gvTaskDep btnShowDepend" runat="server" ID="btnShowDepend" OnCommand="btnShowDepend_Command" CommandName="TaskDepend" AlternateText='<%#Eval("Object") + "," + Eval("FK") %>' CommandArgument='<%#Eval("Object") + "," + Eval("FK") %>' ToolTip="Click to view Dependencies" /> 
      </ItemTemplate> 
     </asp:TemplateField> 
     <asp:BoundField DataField="Service" HeaderText="Service" SortExpression="Service" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:BoundField DataField="Status" HeaderText="Status" SortExpression="Status" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:BoundField DataField="Due Date" HeaderText="Due" SortExpression="Due Date" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:BoundField DataField="Owner" HeaderText="Owner" SortExpression="Owner" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:BoundField DataField="Client" HeaderText="Client" SortExpression="Client" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:BoundField DataField="Site" HeaderText="Site" SortExpression="Site" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:BoundField DataField="Practice" HeaderText="Practice" SortExpression="Practice" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:BoundField DataField="Provider" HeaderText="Provider" SortExpression="Provider" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:BoundField DataField="Roles" HeaderText="Roles" SortExpression="Roles" ItemStyle-CssClass="taskTableColumn" /> 
     <asp:BoundField DataField="Object" HeaderText="Object" SortExpression="Object" ItemStyle-CssClass="hideTag" HeaderStyle-CssClass="hideTag" /> 
     <asp:BoundField DataField="FK" HeaderText="FK" SortExpression="Object" ItemStyle-CssClass="hideTag" HeaderStyle-CssClass="hideTag" /> 
     </Columns> 
</asp:GridView> 

當我嘗試從代碼隱藏imgExpCol，它不能找到它。

如何解決該問題？

Answer 1

由於項目模板是在運行時創建的，因此您將無法訪問它們。嘗試類似

var imgExpCol= yourTasksGV.FindControl("imgExpCol") as Image; 

Answer 2

正如KidBilly所說，您無法直接訪問它們。另外，請注意，由於不允許在單個頁面上具有多個相同的ID（即GridView每行一個按鈕），因此它們的ID在運行時會被損壞，在這種情況下，您需要查看在知道要傳遞給FindControl（）之前它們是如何被破壞的。

舉例來說，我有一個ID =「編輯」一個LinkBut​​ton，當它被渲染，就成了ID =「MainContent_LoginView2_existingAccounts_edit_0」