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Generator QR Code ISO/IEC18004 in Visual C#.NET The ASP.NET MVC Framework

22 The ASP.NET MVC Framework
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manager class to work with the data easily . In Solution Explorer, right-click the Model folder, and add a new class . Name this class DotNetReferencesManager . The DotNetReferencesManager class will wrap the DotNetReferencesDataContext, so have the DotNetReferencesManager create an instance of the DotNetReferencesDataContext class . Then, add a method named GetAllReferences to the DotNetReferencesDataContext class . It should return IQueryable<DotNetReference> . You can use the DotNetReferencesDataContext to fetch all the rows like so:
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using System; using System.Collections.Generic; using System.Linq; using System.Web; namespace MVCORama.Models { public class DotNetReferencesManager { DotNetReferencesDataContext dataContext = new DotNetReferencesDataContext(); public IQueryable<DotNetReference> GetAllReferences() { return dataContext.DotNetReferences; }
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11 . . Create a view for the DotNetReferences model . Right-click the View folder . Create a new View folder and name it DotNetReferences by right-clicking the project s Views folder and clicking New Folder . Right-click the new folder and click Add and then View on the shortcut menu . Visual Studio will then display the Add View dialog box for configuring the view . Visual Studio will name the view Index . Make it strongly typed based on the DotNetReferences class (it will be available in the dialog box) . Leave the master as is . Finally, Visual Studio will generate the following view code for you by using reflection against the DotNetReferences model:
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<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<IEnumerable<MVCORama.DotNetReference>>" %> <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server"> Index </asp:Content> <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server"> <h2>Index</h2> <table> <tr> <th></th> <th>ID</th> <th>Title</th>
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Part V
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<th>AuthorLastName</th> <th>AuthorFirstName</th> <th>Topic</th> <th>Publisher</th> </tr> <% foreach (var item in Model) { %> <tr> <td> <%= Html.ActionLink("Edit", "Edit", new { id=item.ID }) %> | <%= Html.ActionLink("Details", "Details", new { id=item.ID })%> </td> <td> <%= Html.Encode(item.ID) %> </td> <td> <%= Html.Encode(item.Title) %> </td> <td> <%= Html.Encode(item.AuthorLastName) %> </td> <td> <%= Html.Encode(item.AuthorFirstName) %> </td> <td> <%= Html.Encode(item.Topic) %> </td> <td> <%= Html.Encode(item.Publisher) %> </td> </tr> <% } %> </table> <p> <%= Html.ActionLink("Create New", "Create") %> </p> </asp:Content>
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12 . . Notice that the Index .aspx file is based on typical ASP .NET syntax . The Page directive appears at the top of the file followed by the ASP .NET Content control (so as to coordinate content placement with the master page) . The view is tied to a model based on the DotNetReferences class . If you examine the code-beside class, you can see the Index iterates through each Item in the model and displays it . In this case, each Item represents a row in the DotNetReferences class . To show the view correctly, you just need to add a controller to the model and view for the edit scenario . 13 . . Create a controller to handle requests pertaining to the DotNetReferences model . Right-click the Controllers folder and select Add, Controller . When the Add Controller dialog box appears, name your new controller DotNetReferencesController . Visual Studio will create a class based on the MVC framework Controller class . Add an instance of the DotNetReferencesManager to the controller . Look for the method named Index that returns an ActionResult . Instantiate a var in the Index method and use the
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22 The ASP.NET MVC Framework
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DotNetReferencesManager .GetAllReferences method to populate it . The var type is a typeless collection useful for managing a collection of things for when you don t know the type of objects in the collection ahead of time . The code you should add is in bold type in the following example:
using using using using using using using System; System.Collections.Generic; System.Linq; System.Web; System.Web.Mvc; System.Web.Mvc.Ajax; MVCORama.Models;
namespace MVCORama.Controllers { public class DotNetReferencesController : Controller { DotNetReferencesManager dotNetReferencesManager = new DotNetReferencesManager(); public ActionResult Index() { var dotNetReferences = dotNetReferencesManager.GetAllReferences().ToList(); return View("Index", dotNetReferences); } }
14 . . When you navigate to the DotNetReferences page, the MVC framework is set up to show the DotNetReferences view . But to do this, you will need to add a tab to the master page to navigate to the DotNetReferences page as shown:
<%@ Master Language="C#" Inherits="System.Web.Mvc.ViewMasterPage" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title><asp:ContentPlaceHolder ID="TitleContent" runat="server" /></title> <link href="../../Content/Site.css" 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"> <% Html.RenderPartial("LogOnUserControl"); %> </div>
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