定义： ContentPlaceHolder 控件：在 ASP.NET 母版页中定义内容区域。 Content控件：保存文本、标记和服务器控件以呈现给母版页中的 ContentPlaceHolder 控件。 两者关系： ContentPlaceHolder 控件在母版页中定义相对内容区域，并呈现在内容页中找到的相关的 Content 控件的所有文本、标记和服务器控件。 Content 控件使用其ContentPlaceHolderID 属性与 ContentPlaceHolder 关联。将 ContentPlaceHolderID 属性设置为母版页中相关的 ContentPlaceHolder 控件的ID属性的值。 通俗的来讲，ContentPlaceHolder 控件是个容器控件，用来存放内容，但是如果它放在母板页中，那么它的内容页就需要使用Content控件来指定ContentPlaceHolder控件（好像一个指针一样，通过 ContentPlaceHolderID 属性来指定）来放置内容。 注意： ContentPlaceHolder控件如果放在母版页中，那么它的内容页是通过Content控件来链接，是可编辑的。 但是Content控件如果放在母板页中，那么它的内容页中没有东西来对其进行链接，是不可编辑的。 举例： 母版页一的代码： [html] view plaincopyprint? <span style="font-size:18px;"><span style="font-size:13px;"><head runat="server"> <title>演示</title> <asp:ContentPlaceHolder id="head" runat="server"> </asp:ContentPlaceHolder> </head> <body> <form id="form1" runat="server">母版页演示 <div> <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </div> </form> </body></span> </span> <span style="font-size:18px;"><span style="font-size:13px;"><head runat="server"> <title>演示</title> <asp:ContentPlaceHolder id="head" runat="server"> </asp:ContentPlaceHolder> </head> <body> <form id="form1" runat="server">母版页演示 <div> <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </div> </form> </body></span> </span> 母版页一的内容页的代码： [html] view plaincopyprint? <span style="font-size:18px;"><span style="font-size:13px;"><asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> </asp:Content></span> </span> <span style="font-size:18px;"><span style="font-size:13px;"><asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> </asp:Content></span> </span> 母版页二的代码（二级母版页，继承自母版页一）： [html] view plaincopyprint? <span style="font-size:18px;"><span style="font-size:13px;"><asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> </asp:Content></span> </span> <span style="font-size:18px;"><span style="font-size:13px;"><asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> </asp:Content></span> </span> 母版页二的内容页的代码：没有代码，是空白。 问题：这样的话二级母版页的内容页就不能进行编辑，如何解决呢？ 解决：我们只需在二级母版页中添加ContentPlaceHolder控件即可。 举例：上面的母版页二，我们更改后： [html] view plaincopyprint? <span style="font-size:18px;"><span style="font-size:13px;"><asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </asp:Content></span> </span><span style="font-size:13px;"><asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> <asp:ContentPlaceHolder ID="ContentPlaceHolder2" runat="server"> </asp:ContentPlaceHolder> </asp:Content> </span> <span style="font-size:18px;"><span style="font-size:13px;"><asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server"> <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </asp:Content></span> </span><span style="font-size:13px;"><asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> <asp:ContentPlaceHolder ID="ContentPlaceHolder2" runat="server"> </asp:ContentPlaceHolder> </asp:Content> </span> 母版页二的内容页变为： [html] view plaincopyprint? <span style="font-size:13px;"><asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server"> </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder2" Runat="Server"> </asp:Content> </span>
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