use*_*390 10 c# asp.net master-pages
HTML
<body>
<form id="form1" runat="server">
<asp:Button runat="server" ID="a" OnClick="a_Click" Text="apd"/>
</form>
</body>
码
protected void a_Click(object sender,EventArgs e)
{
Response.Write(((Button)FindControl("a")).Text);
}
这段代码工作正常.
但是,这段代码:
HTML
<%@ Page Title="" Language="C#" MasterPageFile="~/Student/MasterPage.master" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Student_Default" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:Button runat="server" ID="a" OnClick="a_Click" Text="andj"/>
</asp:Content>
码
protected void a_Click(object sender, EventArgs e)
{
Response.Write(((Button)FindControl("a")).Text);
}
此代码无效并FindControl返回Null- 为什么会这样？
该FindControl方法适用于简单的页面,但在母版页中,它不起作用吗？
将ID a更改为ctl00_ContentPlaceHolder1_a- 如何找到控件？
Han*_*ans 31
要在内容页面上找到该按钮,您必须先搜索该ContentPlaceHolder1控件.然后使用控件FindControl上的功能ContentPlaceHolder1搜索您的按钮:
ContentPlaceHolder cph = (ContentPlaceHolder)this.Master.FindControl("ContentPlaceHolder1");
Response.Write(((Button)cph.FindControl("a")).Text);