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Master.Master.FindControl("ContentPlaceHolder1").FindControl("Content1")
<%@ Master Language="VB" CodeFile="A.master.vb" Inherits="A" %>
<body>
<form id="form1" runat="server">
<div>
<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</div>
</form>
</body>
</html>
<%@ Master Language="VB" MasterPageFile="~/a.master" AutoEventWireup="false" CodeFile="b.master.vb" Inherits="B" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
<asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">
</asp:ContentPlaceHolder>
</asp:Content>
<%@ Page Title="" Language="VB" MasterPageFile="~/B.master" AutoEventWireup="false" CodeFile="c.aspx.vb" Inherits="c" %>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
</asp:Content>
master.Master.FindControl ("ContentPlaceHolder1") '找到a的ContentPlaceHolder
master '找到b
master.FindControl ("ContentPlaceHolder1") '找不到b的ContentPlaceHolder
master.FindControl ("Content1") '找不到b的Content