마스터페이지에서는 접근이 바로 안됩니다.

한단계 더 통해서 접근이 가능합니다.

 

마스터페이지

<%@ Master Language="C#" AutoEventWireup="true" CodeFile="MasterPage.master.cs" Inherits="MasterPage" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <asp:ContentPlaceHolder id="head" runat="server">
    </asp:ContentPlaceHolder>
</head>
<body>
maseter page
    <form id="form1" runat="server">
    <div>
        <br />
        <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server">
        </asp:ContentPlaceHolder>
    </div>
    </form>
</body>
</html>

 

 

 

마스터페이지로 만들어진 컨텐츠 페이지

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.master" AutoEventWireup="true" CodeFile="Default6.aspx.cs" Inherits="Default6" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

<asp:FileUpload ID="FileUpload2" runat="server" />

<br />
<asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
<br />
<br />
</asp:Content>

 

접근하기

 

protected void Page_Load(object sender, EventArgs e)
{

    ContentPlaceHolder content = this.Master.FindControl("ContentPlaceHolder1") as ContentPlaceHolder;
    if (content != null)
    {

        FileUpload fu = content.FindControl("FileUpload2") as FileUpload;
        if (fu != null) {

            Response.Write(fu.ClientID);
        }
    }
}

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