1.Layout页基础:
如果你有使用MasterPage的经验,你将会记得如下的几个东西

A:<%@ Master %>

B:<%@ Page %>

C:<asp:ContentPlaceHolder />

D:<asp:Content />

但是在Layout中,以上的这些东西将会消失.(作者不排除有WebPages和WebForms兼容工作的可能性)

取而代之的新功能是:

A.Layout属性:等同于原来的MasterPageFile属性.

B.@RenderBody()方法:直接渲染整个View到占位符处,而不需要原来所使用的<asp:Content />.

C.@RenderPage()方法:渲染指定的页面到占位符处.

D.@RenderSection方法:声明一个占位符,和原来的<asp:ContentPlaceHolder />功能类似.

E.@section标记:对@RenderSection方法声明的占位符进行实现,和原来的<asp:Content />功能类似.

2.实践：

Layout页面作用类似于之前WebForm模板页（MasterPage）的作用,起到页面重用、统一界面风格的作用。

首先，我们新建一个MVC3项目，_Layout.cshtm自动生成，l默认位于Web/Views/Shared/。新建个_MyLayout.cshtml.

如果有页面想套用公用的模板页，只需在页面的开头写@Layout = filePath;即可，如页面Index.cshtml

 @{

     //Layout = null;

     Layout = "~/Views/Shared/_MyLayout.cshtml";

 }

 @{

     ViewBag.Title = "Home Page";

 }

 <h2>@ViewBag.Message</h2>

 <p>

     To learn more about ASP.NET MVC visit

     <a href="http://asp.net/mvc" title="ASP.NET MVC Website">http://asp.net/mvc</a>.

 </p>

假设公用模板页的内容为：

 <!DOCTYPE html>

 <html>

 <head>

     <title>@ViewBag.Title</title>

 </head>

 <body>

     这是_MyLayout........

     <div>

         开始呈现调用本模板页的页面原始内容。。。<br />

         @RenderBody()

         <br />

         结束呈现调用本模板页的页面原始内容。。。<br />

     </div>

     再随便写写~~

     @* @RenderBody();错误，一页智能呈现一次 *@

     <div>

         @*RenderPage()可以呈现多次*@

         @RenderPage("~/Views/Shared/Error.cshtml")

         @RenderPage("~/Views/Shared/Error.cshtml")

     </div>

 </body>

 </html>

显示的结果如下：

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" alt="" />

1.如果在首页上不写明@Layout = filePath;

则MVC3自动在本文件夹下寻找_ViewStart.cshtml（里面定义了默认的模板页），使用_ViewStart.cshtml里的模板页设置。如果在本文件夹下找不到，则到上层文件夹下寻找，直到找到_ViewStart.cshtml后使用。如果最终没有找到_ViewStart.cshtml，那么当然，就不用模板页啦！

2.如果在首页上写明@Layout = null;则该页面没有模板页。

链接：http://www.cnblogs.com/highend/archive/2011/04/18/asp_net_mvc3_layout.html（推荐，有图有真相）

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