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If you start the application and navigate to a URL that targets a nonexistent action method, you will see the response shown in Figure 19-10. Figure 19-10. Dealing with requests for action methods that do not exist Improving Performance with Specialized Controllers The MVC Framework provides two special kinds of controllers that may improve the performance of your MVC web applications. Like all performance optimizations, these controllers represent compromises, either in ease of use or with reduced functionality. In the follow sections, I demonstrate both kinds of controllers and outline their benefits and shortcomings. Using Sessionless Controllers By default, controllers support session state, which can be used to store data values across requests, making life easier for the MVC programmer. Creating and maintaining session state is an involved process. Data must be stored and retrieved, and the sessions themselves must be managed so that they expire appropriately. Session data consumes server memory or space in some other storage location, and needing to synchronize the data across multiple Web servers makes it harder to run your application on a server farm. In order to simplify session state, ASP.NET will process only one query for a given session at a time. If the client makes multiple overlapping requests, they will be queued up and processed sequentially by the server. The benefit is that you do not need to worry about multiple requests modifying the same data. The downside is that you do not get the request throughput you might like. Not all controllers need the session state features. In such cases, you can improve the performance of your application by avoiding work involved in maintaining session state. You do this by using sessionless controllers. These are just like regular controllers, with two exceptions: the MVC Framework will not load or store session state when they are used to process a request, and overlapping requests can be processed simultaneously. Managing Session State in a Custom IControllerFactory At the start of this chapter, I showed you that the IControllerFactory interface contained a method called GetControllerSessionBehavior, which returns a value from the SessionStateBehavior enumeration. That enumeration contains four values that control the session state configuration of a controller, as described in Table 19-4. Table 19-4. The Values of the SessionStateBehavior Enumeration Value Description Default Use the default ASP.NET behavior, which is to determine the session state configuration from HttpContext. Required Full read-write session state is enabled. ReadOnly Read-only session state is enabled. Disabled Session state is disabled entirely. A controller factory that implements the IControllerFactory interface directly sets the session state behavior for controllers by returning SessionStateBehavior values from the GetControllerSessionBehavior method. The parameters to this method are a RequestContext object and a string containing the name of the controller. 522
You can return any of the four values shown in the table, and you can return different values for different controllers. As a demonstration, I have changed the implementation of the GetControllerSessionBehavior method in the CustomControllerFactory class that I created earlier in the chapter, as shown in Listing 19-23. Listing 19-23. Defining Session State Behavior for a Controller in the CustomControllerFactory.cs File ... public SessionStateBehavior GetControllerSessionBehavior(RequestContext requestContext, string controllerName) { switch (controllerName) { case "Home": return SessionStateBehavior.ReadOnly; case "Product": return SessionStateBehavior.Required; default: return SessionStateBehavior.Default; } } ... Managing Session State Using DefaultControllerFactory When you are using the built-in controller factory, you can control the session state by applying the SessionState attribute to individual controller classes, as shown in Listing 19-24 where I have created a new controller called FastController. Listing 19-24. Using the SessionState Attribute in the FastController.cs File using System.Web.Mvc; using System.Web.SessionState; using ControllerExtensibility.Models; namespace ControllerExtensibility.Controllers { [SessionState(SessionStateBehavior.Disabled)] public class FastController : Controller { } } public ActionResult Index() { return View("Result", new Result { ControllerName = "Fast ",ActionName = "Index" }); } The SessionState attribute is applied to the controller class and affects all of the actions in the controller. The sole parameter to the attribute is a value from the SessionStateBehavior enumeration. In the example, I disabled session state entirely, which means that if I try to set a session value in the controller, like this: ... Session["Message"] = "Hello"; ... or try to read back from the session state in a view, like this: ... 523
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Pro ASP.NET MVC 5 Adam Freeman 2
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Dedicated to my lovely wife, Jacqui
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Contents About the Author About the
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Preparing the Example Project Defin
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Chapter 9: SportsStore: Completing
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Constraining Routes Constraining a
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Using Other Filter Features Filteri
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Creating the Ajax Form Understandin
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Index 18
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About the Technical Reviewer Fabio
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What Is Wrong with ASP.NET Web Form
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storage and querying language for s
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There are some good reasons for car
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Where Can I Get the Example Code? Y
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Figure 2-1. The Visual Studio ASP.N
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Figure 2-3. The initial file and fo
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Figure 2-6. Adding a controller to
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} } } return View(); A good way of
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Figure 2-9. The MVC Framework tryin
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Visual Studio will create a file ca
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Afternoon"; } } } return View(); I
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Figure 2-14. Adding to the view HTM
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public class HomeController : Contr
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} Will you attend? @Html.DropDown
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Figure 2-18. Setting the default st
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type without needing to qualify the
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[Required(ErrorMessage = "Please en
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Figure 2-21. The validation summary
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Tip You can drag JavaScript and CSS
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expect files to be in certain locat
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RSVP @using (Html.BeginForm()) {
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Thanks body { background-colo
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CHAPTER 3 The MVC Pattern Before I
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ASP.NET MVC doesn’t apply any con
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as thinly disguised Smart UI applic
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this case PasswordResetHelper. I do
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Web server and database. Integratio
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public class AdminControllerTests {
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The drawback of TDD is that it requ
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} } } return "Navigate to a URL to
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namespace LanguageFeatures.Controll
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} set { name = value; } } } public
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The listing demonstrates how to con
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using System.Collections; using Sys
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using System.Collections.Generic; n
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public static IEnumerable FilterByC
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Products = new List { new Product {
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... In this example, myAnonType is
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public string Index() { return "Nav
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Max Min Returns the largest or smal
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usiness while the background work i
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natural syntax, but they do not cha
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} Defining the Controller I am goin
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Note Notice that I declare the view
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Figure 5-4. Creating a new layout S
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Figure 5-5. The Effect of Applying
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Figure 5-6. Adding a view that reli
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Figure 5-9. The content in the layo
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public ActionResult DemoExpression(
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The containing element has data at
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Price@Model.Price Stock Level @sw
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} else { @ViewBag.ProductCount }
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Figure 5-13. Generating elements us
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CHAPTER 6 Essential Tools for MVC I
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LinqValueCalculator to determine th
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In the sections that follow, I expl
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just fine with MVC 5. I have used t
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namespace EssentialTools.Infrastruc
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Figure 6-2. The effect of running t
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I can configure the objects that Ni
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} } The FlexibleDiscountHelper clas
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public object GetService(Type servi
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Figure 6-4. Creating the unit test
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} } } // assert Assert.AreEqual(tot
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wrong"); wrong"); wrong"); } Assert
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} } } Testing and Fixing the Code I
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Listing 6-31. The Contents of the L
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Price = 48.95M}, new Product {Name
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To summarize the example, the Objec
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This is the same behavior used in t
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CHAPTER 7 SportsStore: A Real Appli
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e included in new projects are exce
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public class NinjectDependencyResol
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Figure 7-4. Creating the Product cl
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IProductRepository interface with t
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Figure 7-5. Adding the Views/Produc
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Figure 7-6. Viewing the basic appli
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Figure 7-8. Setting up the SportsSt
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Visual Studio will display a design
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Creating the Entity Framework Conte
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private EFDbContext context = new E
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public class ProductController : Co
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A view model is not part of the dom
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... ... Every namespac
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(ProductsListViewModel)controller.L
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Figure 7-14. Displaying page naviga
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Figure 7-15. The new URL scheme dis
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} @foreach (var p in Model.Products
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Figure 7-18. Creating a partial vie
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Summary In this chapter, I built mo
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using System.Collections.Generic; u
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Assert.AreEqual(pageInfo.TotalPages
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); "", new { controller = "Product"
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} } public string Menu() { return "
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has the effect of declaring a depen
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Figure 8-3. The category links High
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Now that I am providing information
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} ... CurrentCategory = category };
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Continue Shopping button to return
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Arrange - create a new cart Cart ta
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@Model.Name @Model.Price.ToString("
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For the AddToCart and RemoveFromCar
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and the total cost for the cart. Th
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CHAPTER 9 SportsStore: Completing t
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using System.Linq; using System.Web
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public void Adding_Product_To_Cart_
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shopping I added a new column to e
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@ViewBag.Title SPORTS STORE @
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. . . This change generates a link
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@Html.TextBoxFor(x => x.Zip, new {@
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} ViewBag.Title = "SportStore: Chec
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public string Country { get; set; }
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if (emailSettings.WriteAsFile) { sm
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} } } I created an EmailSettings ob
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ViewResult result = target.Checkout
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of the SportsStore.WebUI project an
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Thanks! Thanks for placing your ord
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Figure 10-1. Displaying the SportsS
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waking moment. My advice is to acce
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case, however, I hide the standard
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Bootstrap that the div element shou
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.Select(x => x.Category) .Distinct(
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@Html.ActionLink("Home", "List", "
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variations on the same basic theme.
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} This view uses a Razor foreach
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Figure 10-9. The effect of mobile-s
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public class AdminController : Cont
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Right-click on the Views/Admin fold
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Figure 11-3. Rendering the scaffold
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Figure 11-4. Rendering the modified
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Act Product p1 = target.Edit(1).Vie
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} } public string Category { get; s
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Figure 11-7. Displaying the editor
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Framework does know about and updat
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ActionResult result = target.Edit(p
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using System.ComponentModel.DataAnn
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Install-Package Microsoft.jQuery.Un
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Listing 11-17. Explicitly Specifyin
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Listing 11-19. Implementing Deletio
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You can see the delete feature by c
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Authentication is set
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Figure 12-1. The effect of the Auth
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namespace SportsStore.WebUI.Infrast
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the menu, set the name to Login and
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mock implementations of the IAuthPr
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Figure 12-3. Adding columns to the
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No Image } else { } @Html.Acti
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} } I have added a new parameter to
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[TestClass] public class ImageTests
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Figure 12-4. Adding an image to a p
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CHAPTER 13 Deployment The final, an
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Figure 13-2. Creating a new web sit
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Figure 13-4. The effect of creating
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); [ProductID] INT IDENTITY (1, 1)
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Figure 13-8. The Publish Web dialog
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Figure 13-10. Settings for the depl
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Figure 13-12. Previewing the deploy
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Figure 13-14. The SportsStore appli
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Figure 14-1. Selecting the project
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which packages are used by selectin
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} Or you can disable any layout for
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using System.Web.Mvc; namespace Deb
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If the debug attribute in the Web.c
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Figure 14-9. Hitting a breakpoint N
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Figure 14-11. The effect of assigni
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selecting Delete Breakpoint from th
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Figure 14-15. Enabling Edit and Con
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Figure 14-16. The effect of correct
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Figure 14-18. Selecting multiple br
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CHAPTER 15 URL Routing Before the i
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public class HomeController : Contr
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Figure 15-3. The segments in an exa
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started, which leads to the RouteCo
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namespace UrlsAndRoutes.Tests { [Te
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TestRouteMatch and TestRouteFail co
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Figure 15-5. Using default values t
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In Listing 15-12, I defined a new r
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Notice that, once again, I have pla
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Figure 15-8. Displaying the value o
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namespace UrlsAndRoutes { public cl
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... [TestMethod] public void TestIn
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Figure 15-11. The error displayed w
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"Home/{action}/{id}/{*catchall}", n
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namespace UrlsAndRoutes.Infrastruct
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Using Attribute Routing All of the
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Caution The Route attribute stops c
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} } public ActionResult List() { Vi
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... [Route("∼/Test")] ... Prefixi
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using System.Web.Routing; namespace
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Now, this may seem like a long path
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"Admin") @Html.ActionLink("This
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... Start the application again and
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ActionName The controller is: @Vi
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} For the routing in the example ap
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how outgoing URLs are generated. To
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and repeat the process. If the clas
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ActionName The controller is: @
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The MVC Framework supports organizi
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To demonstrate the way that areas i
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able to request /Admin/Home/Index a
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You do not need to take any special
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intercept requests for disk files b
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outes.Add(new Route("SayHello", new
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http://www.amazon.com/books/pro-asp
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CHAPTER 17 Controllers and Actions
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System.Web.Routing.RequestContext o
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namespace ControllersAndActions.Con
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Retrieve posted data from Request.F
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After a controller has finished pro
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public string Url { get; set; } pub
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RedirectToRouteResult Issues an HTT
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shown in this test method. using Sy
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You can send an object to the view
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Arrange - create the controller Exa
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Listing 17-20. Redirecting to a Lit
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Act - call the action method Redire
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Listing 17-24. Sending a Specific S
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CHAPTER 18 Filters Filters inject e
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} } To create the view that will ga
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} } public ViewResult Create() { //
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} } void OnAuthorization(Authorizat
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Figure 18-2. Re-prompting for crede
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[HttpPost] public ActionResult Logi
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Page 474 and 475: using System.Web.Mvc; using System.
Page 476 and 477: IExceptionFilter { public void OnEx
Page 478 and 479: Figure 18-3. The default exception
Page 480 and 481: } } } } filterContext.ExceptionHand
Page 482 and 483: Figure 18-6. An exception thrown wh
Page 484 and 485: Table 18-9. HandleErrorInfo Propert
Page 486 and 487: using System.Web.Mvc; using Filters
Page 488 and 489: ", } } } } string.Format("Action me
Page 490 and 491: execute the result. You can see how
Page 492 and 493: Figure 18-10. The effect of adding
Page 494 and 495: up manually with the Empty template
Page 496 and 497: I have already explained that filte
Page 498 and 499: Figure 18-14. Specifying the order
Page 500 and 501: Figure 18-15. The default filter be
Page 502 and 503: CHAPTER 19 Controller Extensibility
Page 504 and 505: } } } public ViewResult List() { re
Page 506 and 507: } public GetControllerSessionBehavi
Page 508 and 509: My implementations of the GetContro
Page 510 and 511: RouteConfig.RegisterRoutes(RouteTab
Page 512 and 513: } } You can see the effect of the c
Page 514 and 515: There are no action methods in this
Page 516 and 517: Figure 19-6. Using the method name
Page 518 and 519: [ActionName("Enumerate")] public Vi
Page 520 and 521: } } } }); I have used the ActionNam
Page 524 and 525: Message: @Session["Message"] ... Th
Page 526 and 527: Data: @Model When you run the ap
Page 528 and 529: namespace ControllerExtensibility.C
Page 530 and 531: string viewName, string masterName,
Page 532 and 533: ModelState Returns information abou
Page 534 and 535: view) { } } public void ReleaseView
Page 536 and 537: Figure 20-2. Requesting an unsuppor
Page 538 and 539: Listing 20-10. The Contents of the
Page 540 and 541: Table 20-4. Razor View Engine Searc
Page 542 and 543: Figure 20-5. The effect of custom l
Page 544 and 545: Tip My custom view engine locations
Page 546 and 547: You can check to see if a view has
Page 548 and 549: I am going to start by creating a p
Page 550 and 551: @foreach (string str in Model) { @s
Page 552 and 553: "Pear"}) @Html.Action("Time") You c
Page 554 and 555: } In the Index action method, I pas
Page 556 and 557: Here is the message: @Model Inli
Page 558 and 559: Table 21-3. Useful Properties Defin
Page 560 and 561: troublesome string to the view as t
Page 562 and 563: Figure 21-3. Comparing how data val
Page 564 and 565: Figure 21-5. The effect of selectiv
Page 566 and 567: @model HelperMethods.Models.Person
Page 568 and 569: Note Using the helper methods to g
Page 570 and 571: Layout = "/Views/Shared/_Layout.csh
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} This produces the following form
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... Generating the Input Element fr
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} CreatePerson @using(Html.BeginRou
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CreatePerson label { display: i
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} public class Address { public str
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@{ ViewBag.Title = "CreatePerson";
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Notice that the elements for the Pe
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} return View((object)message); } }
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01/01/0001 00:00:00 Although the
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.editor-field input { height: 20px;
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The value of the property (0 in thi
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[Display(Name = "Birth Date")] publ
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Url Displays the data as a URL (usi
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} public string LastName { get; set
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Figure 22-10. Displaying a complex
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Views/Shared/EditorTemplates folder
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CHAPTER 23 URL and Ajax Helper Meth
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.editor-label { clear: left; } .edi
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action="GetPeople"}) This view co
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Figure 23-2. A simple synchronous f
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I am now ready to start applying un
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as shown in Listing 23-10. Listing
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Setting Ajax Options I can fine-tun
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ViewBag.Title = "GetPeople"; Layout
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Figure 23-6. Prompting the user bef
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I can address this using the AjaxOp
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ole}), } }) Url = Url.Action("Get
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Since I want to present the same da
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Figure 23-9. Working with JSON data
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using System; using System.Collecti
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@foreach (string role in Enum.GetNa
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public class Address { public strin
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Figure 24-1. A simple demonstration
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for the id parameter as follows: 1.
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Figure 24-4. The effect of using a
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This view renders a simple set of l
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Role:@Html.DisplayFor(m => m.Role)
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} Submit You can see the problem if
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using System.Web.Mvc; using MvcMode
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Listing 24-24. Using a Collection A
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... When the form is submitted, th
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Each of the classes listed in Table
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} } } if (ContainsPrefix(key)) { re
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Figure 24-10. The effect of the cus
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using System.Web; using System.Web.
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CHAPTER 25 Model Validation In the
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@ViewBag.Title .field-validati
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Listing 25-7. Explicitly Validating
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Figure 25-2. Errors result in highl
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... Please enter your name Please
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Figure 25-4. Displaying validation
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Figure 25-6. A validation message f
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RegularExpression Required [Require
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Figure 25-8. The error message from
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} } [MustBeTrue(ErrorMessage="You m
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name")); } if (DateTime.Now > Date)
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Both of these settings must be true
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The feedback is also immediate when
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} public JsonResult ValidateDate(st
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has provided is consistent with the
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namespace ClientFeatures.Models { p
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} function processResponse(appt) {
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Figure 26-2. Disabling the browser
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undles.Add(new StyleBundle("∼/Con
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... You won’t need to do this i
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Figure 26-4. Profiling with bundles
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CHAPTER 27 Web API and Single-page
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ReservationRepository.cs to the Mod
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} return RedirectToAction("Index");
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The view model for the partial vie
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elated actions, and makes creating
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This time, the Web API controller h
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using System.Collections.Generic; u
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}; function sendAjaxRequest(httpMet
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Underpinning the Ajax functions is
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Figure 27-3. Monitoring the connect
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... function removeItem(item) { sen
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Client Name Location Save }
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Simplify the Home Controller The Ho
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Remove Create Create Rese
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Index A Account Controller contents
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BeginForm and BeginRoute Form metho
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Custom dependency resolver contents
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table data script button SQL statem
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uilt-In form (see Built-in form hel
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Razor expression shared View Start
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PartyInvites routing system Solutio
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O OnActionExecuted method action fi
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accessing ways context objects acti
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summary, cart definition cart and c
Page 752 and 753:
whole-model templated helpers Test-
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