使用FindControl找不到我的控制 [英] Can´t find my Control with FindControl
本文介绍了使用FindControl找不到我的控制的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在我的网站上工作，有问题。
我从主页面添加控件动态到contentplaceholder。
然后当我想访问的项目我找不到他们的Findcontrol方法，但控制是有，因为我可以看到他们。
I am working on my website and have a problem. I am adding controls dynamic into a contentplaceholder from the master page. Then when i want to access the items I cant find them the Findcontrol method but the controls are there, because i can see them.
MASTER PAGE： / p>
MASTER PAGE:
<body>
<form id="form1" runat="server">
<header id="master_headline" class="headline">Home Smart Home </header>
<nav>
<ul id="nav_hori" runat="server">
<asp:ContentPlaceHolder ID="master_navigation_hori" runat="server">
</asp:ContentPlaceHolder>
</ul>
</nav>
<nav>
<ul id="nav_vert" runat="server">
<asp:ContentPlaceHolder ID="master_navigation_vert" runat="server">
</asp:ContentPlaceHolder>
</ul>
</nav>
<div id="master_content_div">
<asp:ContentPlaceHolder ID="master_content_body" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
不知何故，身体的结束标签不显示，但无论如何。
Somehow the end tag for the body isnt showing but whatever.
主页后面的代码：
protected void Page_Load(object sender, EventArgs e)
{
if (Session["username"] != null)
{
master_navigation_hori.Controls.Add(new LiteralControl(" <li><a href='test.aspx'>" + splitted[1] + "</a></li> "));
//master_navigation_hori.Controls.Add(new LiteralControl("< li class='divider -vertical'></li>"));
master_navigation_hori.Controls.Add(new LiteralControl(" <li><a href='test.aspx'>" + splitted[2] + "</a></li> "));
master_navigation_hori.Controls.Add(new LiteralControl(" <li><a href='test.aspx'>" + splitted[3] + " </a></li> "));
master_navigation_hori.Controls.Add(new LiteralControl("<li class='floatright'><a href='test.aspx'>⚙</a></li>"));
master_navigation_hori.Controls.Add(new LiteralControl("<li class='floatright'><a href='test.aspx'>" + Session["username"] + "</a></li>"));
}
else
{
master_navigation_hori.Controls.Add(new LiteralControl(@"<li class='floatright' id='master_login'>
<a id='master_login-trigger' href='#'>Log in <span>▼</span> </a>
<div id='master_login-content' runat='server'>
<fieldset id='master_inputs'>
<input id='master_input_username' runat='server' type='text' name='username' placeholder='Username' value='test' required='required'/>
<input id='master_input_password' runat='server' type='password' name='password' placeholder='Enter your Password'/>
</fieldset>
<fieldset id='master_actions'>
<input type='submit' id='master_sub_login' runat='server' value='Log in' />
<label><input type='checkbox' id='master_staylogin' runat='server' checked='checked'/> Keep me signed in</label>
</fieldset>
</div>
</li>"));
}
}
内容页代码后面：
protected void Page_Unload(object sender, EventArgs e)
{
if (Page.FindControl("master_login-content") != null)
MessageBox.Show("page");
if( Master.FindControl("master_login-content")!=null)
MessageBox.Show("master");
if ((Master.FindControl("master_navigation_hori").FindControl("master_login-content"))!=null)
MessageBox.Show("combi");
if(FindControl("master_login-content")!=null)
MessageBox.Show("nichts");
MessageBox.Show("end");
}
protected void Page_Load(object sender, EventArgs e)
{
if (Page.FindControl("master_login-content") != null)
MessageBox.Show("page");
if( Master.FindControl("master_login-content")!=null)
MessageBox.Show("master");
if ((Master.FindControl("master_navigation_hori").FindControl("master_login-content"))!=null)
MessageBox.Show("combi");
if(FindControl("master_login-content")!=null)
MessageBox.Show("nichts");
MessageBox.Show("end");
}
这会返回null， MEssageBox。
唯一找到的是master_navigation_hori
This returns everywhere null, it just shows the "end" MEssageBox. the only thing its find is the master_navigation_hori
注意
推荐答案
我已经测试过您的代码。您必须使用 System.Web.UI.HtmlControls.HtmlGenericControl ，而不是 LiteralControl 。
I'm already test your code. You must use System.Web.UI.HtmlControls.HtmlGenericControl instead of LiteralControl.
所以，我进行这样的更改
So, i make a change like this
System.Web.UI.HtmlControls.HtmlGenericControl master_login = new System.Web.UI.HtmlControls.HtmlGenericControl("LI");
master_login.ID = "master_login";
System.Web.UI.HtmlControls.HtmlGenericControl master_login_trigger = new System.Web.UI.HtmlControls.HtmlGenericControl("A");
master_login_trigger.ID = "master_login-trigger";
master_login_trigger.Attributes.Add("href", "#");
master_login_trigger.InnerHtml = "Log in <span>▼</span>";
master_login.Controls.Add(master_login_trigger);
System.Web.UI.HtmlControls.HtmlGenericControl master_login_content = new System.Web.UI.HtmlControls.HtmlGenericControl("DIV");
master_login_content.ID = "master_login-content";
System.Web.UI.HtmlControls.HtmlGenericControl master_inputs = new System.Web.UI.HtmlControls.HtmlGenericControl("FIELDSET");
master_inputs.ID = "master_inputs";
System.Web.UI.HtmlControls.HtmlGenericControl master_input_username = new System.Web.UI.HtmlControls.HtmlGenericControl("INPUT");
master_input_username.ID = "master_input_username";
master_input_username.Attributes.Add("type", "text");
master_input_username.Attributes.Add("name", "username");
master_input_username.Attributes.Add("placeholder", "Username");
master_input_username.Attributes.Add("value", "text");
master_input_username.Attributes.Add("required", "required");
master_inputs.Controls.Add(master_input_username);
System.Web.UI.HtmlControls.HtmlGenericControl master_input_password = new System.Web.UI.HtmlControls.HtmlGenericControl("INPUT");
master_input_password.ID = "master_input_password";
master_input_password.Attributes.Add("type", "password");
master_input_password.Attributes.Add("name", "username");
master_input_password.Attributes.Add("placeholder", "Enter your Password");
master_inputs.Controls.Add(master_input_password);
master_login_content.Controls.Add(master_inputs);
System.Web.UI.HtmlControls.HtmlGenericControl master_actions = new System.Web.UI.HtmlControls.HtmlGenericControl("FIELDSET");
master_actions.ID = "master_actions";
System.Web.UI.HtmlControls.HtmlGenericControl master_sub_login = new System.Web.UI.HtmlControls.HtmlGenericControl("INPUT");
master_sub_login.ID = "master_sub_login";
master_sub_login.Attributes.Add("type", "submit");
master_sub_login.Attributes.Add("value", "Log in");
master_actions.Controls.Add(master_sub_login);
System.Web.UI.HtmlControls.HtmlGenericControl master_staylogin_label = new System.Web.UI.HtmlControls.HtmlGenericControl("LABEL");
master_staylogin_label.ID = "master_staylogin_label";
master_staylogin_label.InnerText = "Keep me signed in";
System.Web.UI.HtmlControls.HtmlGenericControl master_staylogin = new System.Web.UI.HtmlControls.HtmlGenericControl("INPUT");
master_staylogin.ID = "master_staylogin";
master_sub_login.Attributes.Add("type", "checkbox");
master_sub_login.Attributes.Add("checked", "checked");
master_staylogin_label.Controls.Add(master_sub_login);
master_actions.Controls.Add(master_staylogin_label);
master_login_content.Controls.Add(master_actions);
master_login.Controls.Add(master_login_content);
master_navigation_hori.Controls.Add(master_login);
然后将这些控件创建移动到 Page_Init Page_Load 。因为页面首先加载内容页面，然后加载主页。
And move these controls creation to Page_Init instead of Page_Load. Because page load the content-page first and then load the master-page.
这篇关于使用FindControl找不到我的控制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！
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