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Microsoft Visual Studio 2010: A Beginner s Guide
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The file structure in Figure 9-2 shows that Views appear in the Views folder and have a *aspx file extension Each subfolder under the Views folder corresponds to a Controller, and the Views within the subfolder correspond generally to Controller actions When a Controller passes control to a View, by calling View, ASPNET MVC searches for the View in the Views folder with the subfolder named the same as the Controller and the file named the same as the action calling the View Notice that there is a Shared folder Sometimes, you ll want to have a View that is shared by two or more Controller actions, and you can put these shared Views in the Shared subfolder Whenever ASPNET MVC doesn t find a View in the Controller-named subfolder, it will search for the View in the Shared folder An important file in the Shared subfolder is the MasterPage, which is discussed next
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Most sites on the Web have multiple pages, each with common elements They all have the same header, menu, sidebars, and footers When you first build a site, you can duplicate this common content with no trouble, but this copy-and-paste type duplication will cause a lot of headaches in the future The first time you have to change the common elements, you ll need to visit every page If the site has only a few pages, no problem, but the reality is that most sites of any success grow to dozens or hundreds of pages It is beyond practical to try to update every page on a site every time the common content changes This is where MasterPages help, allowing you to specify the common content in one place where you can have content pages that use the MasterPage Whenever something changes in the common content, you update the MasterPage, and every page of a site that uses the MasterPage is automatically updated Listing 9-3 shows the MasterPage, created by ASPNET MVC, that the content page in Listing 9-2 uses
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Listing 9-3 A MasterPage
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<%@ Master Language="C#" Inherits="SystemWebMvcViewMasterPage" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 10 Strict//EN" "http://wwww3org/TR/xhtml1/DTD/xhtml1-strictdtd"> <html xmlns="http://wwww3org/1999/xhtml"> <head runat="server">
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9: Creating Web Applications with ASPNET MVC
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<title> <asp:ContentPlaceHolder ID="TitleContent" runat="server" /> </title> <link href="//Content/Sitecss" rel="stylesheet" type="text/css" /> </head> <body> <div class="page"> <div id="header"> <div id="title"> <h1>My MVC Application</h1> </div> <div id="logindisplay"> <% HtmlRenderPartial("LogOnUserControl"); %> </div> <div id="menucontainer"> <ul id="menu"> <li> <%= HtmlActionLink("Home", "Index", "Home")%> </li> <li> <%= HtmlActionLink("About", "About", "Home")%> </li> </ul> </div> </div> <div id="main"> <asp:ContentPlaceHolder ID="MainContent" runat="server" /> <div id="footer"> </div> </div> </div> </body> </html>
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Microsoft Visual Studio 2010: A Beginner s Guide
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Moving from the top of Listing 9-3 down, you can see the MasterPage directive at the top of the page, which states that this is a MasterPage and ASPNET MVC will handle the page appropriately The DTD is a tag that specifies what Web standards this page supports, which is read by browsers to help them determine the best way to display the page The rest of the page is framed inside of HTML tags and ASPNET MVC markup The html tag states that this is an HTML document HTML documents have two parts, a head and a body, where the head is for metadata describing the page and the body contains display content In HTML, a div tag blocks off a chunk of HTML and is useful for layout and organization of the page The Hx tags, where x is a number between 1 and 6, describe headers, where h1 is the largest and h6 is the smallest The ContentPlaceHolder controls are instrumental to the success of the MasterPage If you look at the Content tags in Listing 9-2, you ll see that they have a ContentPlaceHolderID that matches the ID attributes of the ContentPlaceHolder controls in Listing 9-3 What this means is that when the View renders, the MasterPage will display and ASPNET MVC will inject the Content regions of the content pages into the matching ContentPlaceHolders of the MasterPage ASPNET MVC knows which MasterPage to use because the Page directive, as shown in Listing 9-2, specifies the MasterPage attribute If you recall from the last section, Listing 9-2 had a binding expression for the Html Encode helper method The MasterPage in Listing 9-3 introduces a couple more Html helper methods, RenderPartial and ActionLink The ActionLink method has three parameters: id, controller, and action When the ActionLink renders in the browser, it will transform into an anchor tag, a, with an id specified in the first parameter of ActionLink When the user clicks the link in the browser, the application will navigate to the Controller in the third parameter of ActionLink and invoke the action in the second parameter of ActionLink So, if the user clicked the link produced by ActionLink("About", "About", "Home"), ASPNET MVC will invoke the About action of the Home Controller The next section discusses RenderPartial in more detail
Partial Views (aka User Controls)
It s often the case that you ve written View content on one page and need the same identical content on two or more pages As explained with MasterPages, you want to avoid the maintenance work that comes with updating all of the content that is the same on multiple pages While MasterPages are good for content that decorates pages across an entire site, a Partial View is ideal for limited reuse of View content on different pages of a site
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