Question

在我的应用程序中，我从数据库中获取面板ID，在网页中，我需要找到具有该ID的面板，我需要将其显示为false。代码背后是

 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    Try
            Dim kioskxml As String = "pnlfindid"
            Dim myControl1 As Control = Page.FindControl(kioskxml)
            If (Not myControl1 Is Nothing) Then
                myControl1.Visible = False

            End If


        Catch ex As Exception

        End Try
    End Sub

但是通过上面的代码片段，我无法获取面板，但它可以与文本框等控件一起使用。我需要一种方法来查找页面加载时带有id的面板

我的Html页面

<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">

<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
    </ajaxToolkit:ToolkitScriptManager>
    <div onload="disableBackButton();">
    <table align="center" width="100%" cellpadding="0" cellspacing="0">
    <tr>
    <td>

        <asp:Panel ID="pnlfindId" runat="server">
          <table align="center" width="100%" cellpadding="0" cellspacing="0">
             <tr>
                <td> 
                <asp:Panel ID="pane3" runat="server">
                </asp:Panel>
                     </td>

                    </tr>


                 </table>

                   </asp:Panel>
             </td>

       </tr>


  </table>

     </asp:Content>

由于

Answer 1

也许你需要

Dim myControl1 As Control = Master.FindControl(kioskxml)

或

Dim myControl1 As Control = ContentPlaceHolder1.FindControl(kioskxml)

其他一切看起来都很好......

Answer 2

试用此代码

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    Try

            Dim myControl1 As Control =directcast(Page.FindControl("pnlfindid"),Control)
            If (Not myControl1 Is Nothing) Then
                myControl1.Visible = False

            End If


        Catch ex As Exception

        End Try
    End Sub

Answer 3

我假设您正在尝试在内容页面的加载事件中找到控件，而不是母版页的加载事件。

您需要先找到contentplaceholder，然后在contentplaceholder中找到该面板由于我不熟悉VB.NET语法，因此我提供了C＃语法：

ContentPlaceHolder cont = (ContentPlaceHolder)this.Master.FindControl("ContentPlaceHolder1");
Panel myPanel = cont.FindControl(kioskxml);

当然，如果你是在母版页的页面加载事件中这样做的话，

 ContentPlaceHolder cont = (ContentPlaceHolder)this.FindControl("ContentPlaceHolder1");
 Panel myPanel = cont.FindControl(kioskxml);

在具有面板ID的asp页面中查找面板

3 个答案: