母版.FindControl课堂 [英] MasterPage .FindControl in Class
问题描述
我试图找到一种控制，图像按钮准确的说，从内容页的母版页的访问。以下是母版页的html代码：
I try to find a control, an image button to be exact, in master page access from content pages. Following is the master page html code:
<body>
<form id="form1" runat="server">
<div class="navLeft">
<br />
<asp:ImageButton ID="imgbtnMooring" runat="server"
Height="60px" ImageUrl="~/Item/RibbonIcon/Dashboard.png" />
<br />
</div>
<div class="navTop">
</div>
<div class="banner">
<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
<div class="divider">
<asp:ContentPlaceHolder id="ContentPlaceHolder2" runat="server">
</asp:ContentPlaceHolder>
</div>
<div class="content">
<asp:ContentPlaceHolder id="ContentPlaceHolder3" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
在这样做时，我把下面的代码在内容页aspx.cs文件
I success in doing so when i put the following code in the content page aspx.cs file
string validMooring = "";
comm = new SqlCommand("SELECT * FROM dbo.StructureCurrent", conn);
conn.Open();
reader = comm.ExecuteReader();
while (reader.Read())
{
validMooring = reader["StructureMooring"].ToString();
}
switch (validMooring)
{
case "YES":
(Page.Master.FindControl("imgbtnMooring") as ImageButton).Enabled = true;
(Page.Master.FindControl("imgbtnMooring") as ImageButton).ImageUrl = "~/Item/RibbonIcon/Dashboard.png";
break;
case "NO":
(Page.Master.FindControl("imgbtnMooring") as ImageButton).Enabled = false;
(Page.Master.FindControl("imgbtnMooring") as ImageButton).ImageUrl = "~/Item/RibbonIcon - Grey/DashboardGrey.png";
break;
default:
break;
}
现在我尽量让名为GeneralClass一个类文件，这样上面的代码可以在任何内容页面的访问。 SQL命令只是提取YES /从服务器没有价值，所以我觉得它的东西，可以忽略我的问题。
Right now I try to make a class file named GeneralClass so that above code can be access in any content pages. The sql command is just to extract the YES/NO value from server, so I think it something that can be ignore for my problem.
以下是在GeneralClass代码类文件：
Following is the code in the GeneralClass class file:
MasterPage masterPage = new MasterPage();
masterPage.MasterPageFile = "~/GeneralLayout.master";
string validMooring = "";
comm = new SqlCommand("SELECT * FROM dbo.StructureCurrent", conn);
conn.Open();
reader = comm.ExecuteReader();
while (reader.Read())
{
validMooring = reader["StructureMooring"].ToString();
}
switch (validMooring)
{
case "YES":
(masterPage.FindControl("imgbtnMooring") as ImageButton).Enabled = true;
(masterPage.FindControl("imgbtnMooring") as ImageButton).ImageUrl = "~/Item/RibbonIcon/Dashboard.png";
break;
case "NO":
(masterPage.FindControl("imgbtnMooring") as ImageButton).Enabled = false;
(masterPage.FindControl("imgbtnMooring") as ImageButton).ImageUrl = "~/Item/RibbonIcon - Grey/DashboardGrey.png";
break;
default:
break;
}
但不知何故，该行（masterPage.FindControl（imgbtnMooring）作为的ImageButton）返回空值。
But somehow the line (masterPage.FindControl("imgbtnMooring") as ImageButton) return null value.
谁能帮我解决这个问题？
Can anyone help me with this problem?
推荐答案
我觉得客场做我想要的东西这是找到母版页上，并通过YES控制/为启用从服务器没有价值/禁用按钮。以下是我使用的代码。不像我的问题在我张贴代码为一个图像按钮，我将发布2图像按钮代码，而不是为了更好的理解。这个代码是我的'GeneralClass'类文件
I found away to do the thing that i want which is to find the control on master page and by using the YES/NO value from server to enabled/disabled the button. Following is the code I use. Unlike in my question in which I post code for one image button, I will post code for 2 image button instead for better understanding. This code is for my 'GeneralClass' class file
public void validNavLeft()
{
string validHull = "", validMooring = "";
comm = new SqlCommand("SELECT * FROM dbo.StructureCurrent", conn);
conn.Open();
reader = comm.ExecuteReader();
while (reader.Read())
{
validHull = reader["StructureHull"].ToString();
validMooring = reader["StructureMooring"].ToString();
}
var pageHandler = HttpContext.Current.CurrentHandler;
Control ctrlHull = ((Page)pageHandler).Master.FindControl("imgbtnHull");
ImageButton imgBtnHull = (ImageButton)ctrlHull;
Control ctrlMooring = ((Page)pageHandler).Master.FindControl("imgbtnMooring");
ImageButton imgBtnMooring = (ImageButton)ctrlMooring;
switch (validHull)
{
case "YES":
imgBtnHull.Enabled = true;
imgBtnHull.ImageUrl = "~/Item/RibbonIcon/Dashboard.png";
break;
case "NO":
imgBtnHull.Enabled = false;
imgBtnHull.ImageUrl = "~/Item/RibbonIcon - Grey/DashboardGrey.png";
break;
default:
break;
}
switch (validMooring)
{
case "YES":
imgBtnMooring.Enabled = true;
imgBtnMooring.ImageUrl = "~/Item/RibbonIcon/Dashboard.png";
break;
case "NO":
imgBtnMooring.Enabled = false;
imgBtnMooring.ImageUrl = "~/Item/RibbonIcon - Grey/DashboardGrey.png";
break;
default:
break;
}
}
这篇关于母版.FindControl课堂的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
