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... Start the application again and you will see that the call to the ActionLink helper method in the ActionName.cshtml view produces the following HTML element: This is an outgoing URL This time, the value I assigned to the id property is included as a URL segment, in keeping with the active route in the application configuration. UNDERSTANDING SEGMENT VARIABLE REUSE When I described the way that routes are matched for outbound URLs, I explained that when trying to find values for each of the segment variables in a route’s URL pattern, the routing system will look at the values from the current request. This is a behavior that confuses many programmers and can lead to a lengthy debugging session. Imagine the application has a single route, as follows: ... routes.MapRoute("MyRoute", "{controller}/{action}/{color}/{page}"); ... Now imagine that a user is currently at the URL /Catalog/List/Purple/123, and I render a link as follows: ... @Html.ActionLink("Click me", "List", "Catalog", new {page=789}, null) ... You might expect that the routing system would be unable to match the route, because I have not supplied a value for the color segment variable, and there is no default value defined. You would, however, be wrong. The routing system will match against the route I defined. It will generate the following HTML: Click me The routing system is keen to make a match against a route, to the extent that it will reuse segment variable values from the incoming URL. In this case, I end up with the value Purple for the color variable, because of the URL from which my imaginary user started. This is not a behavior of last resort. The routing system will apply this technique as part of its regular assessment of routes, even if there is a subsequent route that would match without requiring values from the current request to be reused. The routing system will reuse values only for segment variables that occur earlier in the URL pattern rather than any parameters that are supplied to the Html.ActionLink method. Suppose I tried to create a link like this: ... @Html.ActionLink("Click me", "List", "Catalog", new {color="Aqua"}, null) ... I have supplied a value for color, but not for page. But color appears before page in the URL pattern, and so the routing system won’t reuse the values from the incoming URL, and the route will not match. The best way to deal with this behavior is to prevent it from happening. I strongly recommend that you do not rely on this behavior, and that you supply values for all of the segment variables in a URL pattern. Relying on this behavior will not only make your code harder to read, but you end up making assumptions about the order in which your users make requests, which is something that will ultimately bite you as your application enters maintenance. Specifying HTML Attributes I have focused on the URL that the ActionLink helper method generates, but remember that the method generates a complete HTML anchor (a) element. I can set attributes for this element by providing an anonymous type whose properties 408
correspond to the attributes I require. Listing 16-8 shows how I modified the ActionName.cshtml view to set an id attribute and assign a class to the HTML a element. Listing 16-8. Generating an Anchor Element with Attributes in the ActionName.cshtml File @{ } Layout = null; ActionName The controller is: @ViewBag.Controller The action is: @ViewBag.Action @Html.ActionLink("This is an outgoing URL", "Index", "Home", null, new { id = "myAnchorID", @class = "myCSSClass" }) I created a new anonymous type that has id and class properties, and passed it as a parameter to the ActionLink method. I passed null for the additional segment variable values, indicating that I do not have any values to supply. Tip Notice that I prepended the class property with a @ character. This is a C# language feature that lets reserved keywords be used as the names for class members. This is the technique that I used to assign elements to Bootstrap classes in the SportsStore application in Part 1 of this book. When this call to ActionLink is rendered, I get the following HTML: This is an outgoing URL Generating Fully Qualified URLs in Links All of the links that I have generated so far have contained relative URLs, but I can also use the ActionLink helper method to generate fully qualified URLs, as shown in Listing 16-9. Listing 16-9. Generating a Fully Qualified URL in the ActionNane.cshtml File @{ } Layout = null; 409
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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
Page 358 and 359: Figure 14-18. Selecting multiple br
Page 360 and 361: CHAPTER 15 URL Routing Before the i
Page 362 and 363: public class HomeController : Contr
Page 364 and 365: Figure 15-3. The segments in an exa
Page 366 and 367: started, which leads to the RouteCo
Page 368 and 369: namespace UrlsAndRoutes.Tests { [Te
Page 370 and 371: TestRouteMatch and TestRouteFail co
Page 372 and 373: Figure 15-5. Using default values t
Page 374 and 375: In Listing 15-12, I defined a new r
Page 376 and 377: Notice that, once again, I have pla
Page 378 and 379: Figure 15-8. Displaying the value o
Page 380 and 381: namespace UrlsAndRoutes { public cl
Page 382 and 383: ... [TestMethod] public void TestIn
Page 384 and 385: Figure 15-11. The error displayed w
Page 386 and 387: "Home/{action}/{id}/{*catchall}", n
Page 392 and 393: namespace UrlsAndRoutes.Infrastruct
Page 394 and 395: Using Attribute Routing All of the
Page 396 and 397: Caution The Route attribute stops c
Page 398 and 399: } } public ActionResult List() { Vi
Page 400 and 401: ... [Route("∼/Test")] ... Prefixi
Page 402 and 403: using System.Web.Routing; namespace
Page 404 and 405: Now, this may seem like a long path
Page 406 and 407: "Admin") @Html.ActionLink("This
Page 410 and 411: ActionName The controller is: @Vi
Page 412 and 413: } For the routing in the example ap
Page 414 and 415: how outgoing URLs are generated. To
Page 416 and 417: and repeat the process. If the clas
Page 418 and 419: ActionName The controller is: @
Page 420 and 421: The MVC Framework supports organizi
Page 422 and 423: To demonstrate the way that areas i
Page 424 and 425: able to request /Admin/Home/Index a
Page 426 and 427: You do not need to take any special
Page 428 and 429: intercept requests for disk files b
Page 430 and 431: outes.Add(new Route("SayHello", new
Page 432 and 433: http://www.amazon.com/books/pro-asp
Page 434 and 435: CHAPTER 17 Controllers and Actions
Page 436 and 437: System.Web.Routing.RequestContext o
Page 438 and 439: namespace ControllersAndActions.Con
Page 440 and 441: Retrieve posted data from Request.F
Page 442 and 443: After a controller has finished pro
Page 444 and 445: public string Url { get; set; } pub
Page 446 and 447: RedirectToRouteResult Issues an HTT
Page 448 and 449: shown in this test method. using Sy
Page 450 and 451: You can send an object to the view
Page 452 and 453: Arrange - create the controller Exa
Page 454 and 455: Listing 17-20. Redirecting to a Lit
Page 456 and 457: 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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} } public void OnAuthenticationCha
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using System.Web.Mvc; using System.
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IExceptionFilter { public void OnEx
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Figure 18-3. The default exception
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} } } } filterContext.ExceptionHand
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Figure 18-6. An exception thrown wh
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Table 18-9. HandleErrorInfo Propert
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using System.Web.Mvc; using Filters
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", } } } } string.Format("Action me
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execute the result. You can see how
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Figure 18-10. The effect of adding
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up manually with the Empty template
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I have already explained that filte
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Figure 18-14. Specifying the order
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Figure 18-15. The default filter be
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CHAPTER 19 Controller Extensibility
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} } } public ViewResult List() { re
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} public GetControllerSessionBehavi
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My implementations of the GetContro
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RouteConfig.RegisterRoutes(RouteTab
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} } You can see the effect of the c
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There are no action methods in this
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Figure 19-6. Using the method name
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[ActionName("Enumerate")] public Vi
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} } } }); I have used the ActionNam
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If you start the application and na
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Message: @Session["Message"] ... Th
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Data: @Model When you run the ap
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namespace ControllerExtensibility.C
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string viewName, string masterName,
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ModelState Returns information abou
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view) { } } public void ReleaseView
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Figure 20-2. Requesting an unsuppor
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Listing 20-10. The Contents of the
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Table 20-4. Razor View Engine Searc
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Figure 20-5. The effect of custom l
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Tip My custom view engine locations
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You can check to see if a view has
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I am going to start by creating a p
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@foreach (string str in Model) { @s
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"Pear"}) @Html.Action("Time") You c
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} In the Index action method, I pas
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Here is the message: @Model Inli
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Table 21-3. Useful Properties Defin
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troublesome string to the view as t
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Figure 21-3. Comparing how data val
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Figure 21-5. The effect of selectiv
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@model HelperMethods.Models.Person
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Note Using the helper methods to g
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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)
Page 684 and 685:
Both of these settings must be true
Page 686 and 687:
The feedback is also immediate when
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} public JsonResult ValidateDate(st
Page 690 and 691:
has provided is consistent with the
Page 692 and 693:
namespace ClientFeatures.Models { p
Page 694 and 695:
} 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
Page 714 and 715:
This time, the Web API controller h
Page 716 and 717:
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 }
Page 728 and 729:
Simplify the Home Controller The Ho
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Remove Create Create Rese
Page 732 and 733:
Index A Account Controller contents
Page 734 and 735:
BeginForm and BeginRoute Form metho
Page 736 and 737:
Custom dependency resolver contents
Page 738 and 739:
table data script button SQL statem
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uilt-In form (see Built-in form hel
Page 742 and 743:
Razor expression shared View Start
Page 744 and 745:
PartyInvites routing system Solutio
Page 746 and 747:
O OnActionExecuted method action fi
Page 748 and 749:
accessing ways context objects acti
Page 750 and 751:
summary, cart definition cart and c
Page 752 and 753:
whole-model templated helpers Test-
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