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The feedback is also immediate when the user corrects the error. If you return to the name field and keep typing, the validation error will be removed when the name you have entered is three or more characters long. But if you keep typing until you get to the eleventh character, you will see the error reappear. This is because I specified a minimum length of three characters and a maximum length of ten for the ClientName property with the StringLength attribute. This kind of dynamic feedback helps the user to provide the data that the application requires without having to submit the form to the server and wait for a response. Understanding How Client-Side Validation Works One of the benefits of using the MVC Framework client-side validation feature is that I do not have to write any JavaScript. Instead, the validation rules are expressed using HTML attributes. Here is the HTML that is rendered by the Html.EditorFor helper for the ClientName property when client-side validation is disabled: ... ... And here is the HTML rendered for the same property when client-side validation is switched on: ... ... The MVC client-side validation support doesn’t generate any JavaScript or JSON data to direct the validation process; like much of the rest of the MVC Framework, validation relies on convention. The first attribute that was added is data-val. The jQuery Validation library identifies those fields that require validation by looking for this attribute. Individual validation rules are specified using an attribute in the form data-val- , where name is the rule to be applied. So, for example, the Required attribute I applied to the model class has resulted in a data-val-required attribute in the HTML. The value associated with the attribute is the error message associated with the rule. Some rules require additional attributes. You can see this with the length rule, which has data-val-length-min and data-vallength-max attributes to let me specify the minimum and maximum string lengths that are allowed. The interpretation of the required and length validation rules is provided by the jQuery Validation library, on which the MVC client validation features are built. AVOIDING CONFLICTS WITH BROWSER VALIDATION Some of the current generation of HTML5 browsers support simple client side validation based on the attributes applied to input elements. The general idea is that, say, an input element to which the required attribute has been applied, for example, will cause the browser to display a validation error when the user tries to submit the form without providing a value. If you are generating form elements from models, as I have been doing in this chapter, then you won’t have any problems with browser validation because the MVC Framework generates and uses data attributes to denote validation rules (so that, for example, an input element that must have a value is denoted with the data-val-required attribute, which browsers do not recognize). However, you may run into problems if you are unable to completely control the markup in your application, something that often happens when you are passing on content generated elsewhere. The result is that the jQuery validation and the browser validation can both operate on the form, which is just confusing to the user. To avoid this problem, you can add the novalidate attribute to the form element. 686
One of the nice features about the MVC client-side validation is that the same attributes used to specify validation rules are applied at the client and at the server. This means that data from browsers that do not support JavaScript are subject to the same validation as those that do, without requiring any additional effort. MVC CLIENT VALIDATION VERSUS JQUERY VALIDATION The MVC client-validation features are built on top of the jQuery Validation library. If you prefer, you can use the Validation library directly and ignore the MVC features. The Validation library is flexible and feature-rich. It is well worth exploring, if only to understand how to customize the MVC features to take best advantage of the available validation options. I cover the jQuery Validation library in depth in my Pro jQuery 2.0 book, also published by Apress. Performing Remote Validation The last validation feature I will look at in this chapter is remote validation. This is a client-side validation technique that invokes an action method on the server to perform validation. A common example of remote validation is to check whether a username is available in applications when such names must be unique; the user submits the data, and the client-side validation is performed. As part of this process, an Ajax request is made to the server to validate the username that has been requested. If the username has been taken, a validation error is displayed so that the user can enter another value. This may seem like regular server-side validation, but there are some benefits to this approach. First, only some properties will be remotely validated; the client-side validation benefits still apply to all the other data values that the user has entered. Second, the request is relatively lightweight and is focused on validation, rather than processing an entire model object. The third difference is that the remote validation is performed in the background. The user doesn’t have to click the submit button and then wait for a new view to be rendered and returned. It makes for a more responsive user experience, especially when there is a slow network between the browser and the server. That said, remote validation is a compromise. It strikes a balance between client-side and server-side validation, but it does require requests to the application server, and it is not as quick to validate as normal client-side validation. The first step toward using remote validation is to create an action method that can validate one of the model properties. I am going to validate the Date property of the Appointment model to ensure that the requested appointment is in the future. (This is one of the original validation rules I used at the start of the chapter, but which isn’t possible to validate using the standard client-side validation features.) In Listing 25-24, you can see the ValidateDate action method that I added to the Home controller. Listing 25-24. Adding a Validation Action Method to the HomeController.cs File using System; using System.Web.Mvc; using ModelValidation.Models; namespace ModelValidation.Controllers { public class HomeController : Controller { public ViewResult MakeBooking() { return View(new Appointment { Date = DateTime.Now }); } [HttpPost] public ViewResult MakeBooking(Appointment appt) { if (ModelState.IsValid) { // statements to store new Appointment in a // repository would go here in a real project return View("Completed", appt); } else { return View(); } 687
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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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} } 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
Page 636 and 637: Figure 24-1. A simple demonstration
Page 638 and 639: for the id parameter as follows: 1.
Page 640 and 641: Figure 24-4. The effect of using a
Page 642 and 643: This view renders a simple set of l
Page 644 and 645: Role:@Html.DisplayFor(m => m.Role)
Page 646 and 647: } Submit You can see the problem if
Page 648 and 649: using System.Web.Mvc; using MvcMode
Page 650 and 651: Listing 24-24. Using a Collection A
Page 652 and 653: ... When the form is submitted, th
Page 654 and 655: Each of the classes listed in Table
Page 656 and 657: } } } if (ContainsPrefix(key)) { re
Page 658 and 659: Figure 24-10. The effect of the cus
Page 660 and 661: using System.Web; using System.Web.
Page 662 and 663: CHAPTER 25 Model Validation In the
Page 664 and 665: @ViewBag.Title .field-validati
Page 666 and 667: Listing 25-7. Explicitly Validating
Page 668 and 669: Figure 25-2. Errors result in highl
Page 670 and 671: ... Please enter your name Please
Page 672 and 673: Figure 25-4. Displaying validation
Page 674 and 675: Figure 25-6. A validation message f
Page 676 and 677: RegularExpression Required [Require
Page 678 and 679: Figure 25-8. The error message from
Page 680 and 681: } } [MustBeTrue(ErrorMessage="You m
Page 682 and 683: name")); } if (DateTime.Now > Date)
Page 684 and 685: Both of these settings must be true
Page 688 and 689: } 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) {
Page 696 and 697: Figure 26-2. Disabling the browser
Page 698 and 699: undles.Add(new StyleBundle("∼/Con
Page 700 and 701: ... You won’t need to do this i
Page 702 and 703: Figure 26-4. Profiling with bundles
Page 704 and 705: CHAPTER 27 Web API and Single-page
Page 706 and 707: ReservationRepository.cs to the Mod
Page 708 and 709: } return RedirectToAction("Index");
Page 710 and 711: The view model for the partial vie
Page 712 and 713: 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
Page 718 and 719: }; function sendAjaxRequest(httpMet
Page 720 and 721: Underpinning the Ajax functions is
Page 722 and 723: Figure 27-3. Monitoring the connect
Page 724 and 725: ... function removeItem(item) { sen
Page 726 and 727: Client Name Location Save }
Page 728 and 729: Simplify the Home Controller The Ho
Page 730 and 731: 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
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summary, cart definition cart and c
Page 752 and 753:
whole-model templated helpers Test-
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