如何使用母版从 asp:content 页面访问母版页上的用户控件？
我不断收到这些“让我成为一个执行 xyz 操作的工具”的请求 网络应用 我们正在发布。
因此，在第三次之后，我意识到将它们全部放在一起并使用母版页会更容易。
我有一个名为 MessageCenter 的用户控件，用于显示错误、成功和参考消息，因此我将其放在母版页上。
<%@ Master Language="VB" CodeFile="tfMasterPage.master.vb" Inherits="tfMasterPage" %>
<%@ Register Src="MessageCenter/msgCenter.ascx" TagName="msgCenter" TagPrefix="uc1" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>INSERT TITLE HERE</title>
<link href="Stylesheets/EogTool.css" rel="stylesheet" type="text/css" />
<link href="stylesheets/TF_Main_Styles.css" rel="stylesheet" type="text/css" />
<link href="stylesheets/TF_Print_Styles.css" rel="stylesheet" type="text/css" media="print" />
</head>
<body style="background-color: #eeeeee">
<form id="form1" runat="server">
<div class="page">
<div class="headerArea">
<div class="LogoImg">
<img alt="Transparency Florida" src="images/TF_Logo.jpg" /></div>
<div class="SealImg">
<img alt="Shining the Light on Florida's Budget" src="images/TF_Seal.jpg" /></div>
</div>
<div class="content">
<h1>
FIS - EOG Table Maintenance</h1>
</div>
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<div class="content">
<div>
<uc1:msgCenter ID="MsgCenter1" runat="server" />
</div>
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
...
通常，当 msgcenter 位于常规 aspx 页面上时，我会从代码隐藏中调用其方法和内容，如下所示：
...
rtn = dal.deleteRow(CInt(e.CommandArgument), currentTab())
If Not IsNumeric(rtn) Then
MsgCenter1.addMessage("An Error occured deletion" & rtn, , , , "E")
Else
MsgCenter1.addMessage("Delete Successful", , , , "S")
End If
bindGrid()
MsgCenter1.Visible = True
End Sub
但是当我尝试使用页面上的 asp:content 来执行此操作时母版页，它告诉我 msgCenter1 未声明。 这是某种范围问题。
我读过有关使用 findcontrol 的内容，例如
ctype(master.findcontrol("tbWhatever"), textbox).text = "FOO"
但是当我尝试转换为我的用户控件时，它会抱怨，因为它再次没有声明。
我感觉自己好像只漏掉了拼图中的一块，但从昨天下午 4 点左右开始，它就一直在困扰着我。
任何建议、指示或链接将不胜感激。
谢谢。
I keep getting these requests for 'make me a tool to do xyz' for a web app we're putting up.
So after the third one, I realized it'd be easier to lump them all together and use a master page.
I've got a user control called MessageCenter I use for error, success, and informational messages, and so I dropped that on the master page.
<%@ Master Language="VB" CodeFile="tfMasterPage.master.vb" Inherits="tfMasterPage" %>
<%@ Register Src="MessageCenter/msgCenter.ascx" TagName="msgCenter" TagPrefix="uc1" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>INSERT TITLE HERE</title>
<link href="Stylesheets/EogTool.css" rel="stylesheet" type="text/css" />
<link href="stylesheets/TF_Main_Styles.css" rel="stylesheet" type="text/css" />
<link href="stylesheets/TF_Print_Styles.css" rel="stylesheet" type="text/css" media="print" />
</head>
<body style="background-color: #eeeeee">
<form id="form1" runat="server">
<div class="page">
<div class="headerArea">
<div class="LogoImg">
<img alt="Transparency Florida" src="images/TF_Logo.jpg" /></div>
<div class="SealImg">
<img alt="Shining the Light on Florida's Budget" src="images/TF_Seal.jpg" /></div>
</div>
<div class="content">
<h1>
FIS - EOG Table Maintenance</h1>
</div>
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<div class="content">
<div>
<uc1:msgCenter ID="MsgCenter1" runat="server" />
</div>
<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">
...
Normally, when the msgcenter is on a regular aspx page, I call its method and stuff from the codebehind as in this sub:
...
rtn = dal.deleteRow(CInt(e.CommandArgument), currentTab())
If Not IsNumeric(rtn) Then
MsgCenter1.addMessage("An Error occured deletion" & rtn, , , , "E")
Else
MsgCenter1.addMessage("Delete Successful", , , , "S")
End If
bindGrid()
MsgCenter1.Visible = True
End Sub
But when I try to do that from the asp:content thing on the page using the masterpage, it tells me that msgCenter1 is not declared. It's some sort of scope issue.
I've read about using findcontrol like
ctype(master.findcontrol("tbWhatever"), textbox).text = "FOO"
But when I try to cast to my user control, it complains because it once again, isn't declared.
I feel as though I'm just missing one piece of the puzzle, but it's been eluding me since around 4PM yesterday.
Any advice, pointers, or links would be most appreciated.
Thanks.
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首先将此指令添加到您要访问母版页的内容页中
其次，在母版页上设置一个公共属性，该属性返回您要访问的控件
最后只需访问内容页中的控件，如下所示
First add this directive to the content page you want to access the master page
Second, On the master page setup a public propery that returns the control you want to access
Lastly just access the control in the content page like so
我知道您的问题已得到解答，但这不适用于它，但我注意到您正在为“MessageCenter”控件传递 1 个长度的字符。 我会使用枚举而不是字符串来使您的代码不那么脆弱。 就目前情况而言，您可以将“屁”作为参数传递，它会编译得很好。 枚举将为您提供一些编译时检查并避免运行时出现任何问题。
示例：
消息.成功
消息.错误
消息.警告
I know your question has been answered and this doesn't apply to it, but I noticed you're passing in 1 length characters for your "MessageCenter" control. I would use an Enum instead of a string to make your code a little less brittle. As it stands now you can pass "fart" in as a parameter and it will compile just fine. An Enum will give you some compile time checking and avoid any issues at runtime.
Examples:
Message.Success
Message.Error
Message.Warning
这就是我所使用的。
this is what i'd been used.