Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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364 x CHAPTER 10 ASP.NET AJAX What Are Web Services? Web services are essentially methods that you can call over the Internet and that can optionally return data to the calling code. This makes them ideal for exchanging data between different systems. Because web services are based on solid and well-understood standards, they make it easy to exchange data between different types of platforms and systems. For example, with a web service it’s possible to exchange data between an ASP.NET website running on Microsoft Windows and a PHP-based site running on Linux. But at the same time, it’s also possible to exchange data between an ASP.NET or PHP website and a client browser using JavaScript. Introducing WCF To build web services in an ASP.NET website, you use Windows Communication Foundation (WCF), Microsoft’s platform for service-oriented applications using the .NET Framework. In previous versions of ASP.NET you could also make use of so-called ASMX web services, but these have now been deprecated in favor of WCF. However, this isn’t really a problem because WCF can do anything that ASMX web services could do and much more. WCF supports a number of different underlying network communication technologies such as HTTP, .NET Remoting, Microsoft Message Queuing, and Enterprise Services. This makes it an ideal platform for the exchange of data in a variety of scenarios such as locally on a single machine, on a corporate network, or over the Internet. For public-facing websites such as the Planet Wrox site, HTTP or HTTPS (the secured version of HTTP) is the natural choice because it will work cross-browser and across firewalls. For information about the other supported technologies, check out this article on the MSDN website at http://msdn.microsoft.com/library/dd943056.aspx or get a copy of Professional WCF 4: Windows Communication Foundation with .NET 4 (Wrox, ISBN: 978-0-470-56314-4). To build a WCF web service, you add a WCF service (with an .svc extension) to your project. As you see later, you have a few different templates available, each serving a different purpose. Inside this service file you define a Service Contract and an Operation Contract. The Service Contract defines the overall service and the Operation Contract defines the various methods that are available on the service. The following snippet shows a simple WCF service with a single method: VB.NET Public Class NameService Public Function HelloWorld(name As String) As String Return String.Format("Hello {0}", name) End Function End Class C# [ServiceContract(Namespace = "")] [AspNetCompatibilityRequirements(
Using Web Services and Page Methods in Ajax Websites x 365 RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)] public class NameService { [OperationContract] public string HelloWorld(string name) { return string.Format("Hello {0}", name); } } You define the Service Contract by applying a ServiceContract attribute to your class. An attribute is like a little tag or label that you can stick on code elements, like classes, methods, properties, and so on, to mark that piece of code as something special. Other code interacting with the attributed code can then see what attributes that code contains and make decisions based on that information. Don’t worry about that too much because you don’t have to read those attributes yourself when working with web services. All you need to do is stick the attribute on a class or method to enable it for WCF. In C# you use square brackets to wrap the attribute, whereas VB.NET uses angle brackets. You may also come across examples where the VB.NET attribute is followed by a space and an underscore, because previous versions of VB.NET required this. You don’t need the underscore anymore, although it’s perfectly valid to use it anyway. With this attribute in place, you signal to the run time that you really want to expose this class as a WCF service. The AspNetCompatibilityRequirements attribute that is applied to the service class determines how the WCF service behaves at run time. The Allowed value enables your service to run in what’s called the ASP.NET Compatibility Mode, which runs the WCF service in a similar way ASMX services were run. When you set the value to NotAllowed, your services won’t run correctly in your ASP.NET websites. Besides the attribute on the class, each method you want to expose to the service is marked with the OperationContract attribute. This opt-in model enables you to create other methods (for example, helper methods that you call from your service methods) without exposing them to your service. Calling Services from Client-Side Code Calling a WCF service from a client HTML page is really simple. ASP.NET takes care of most of the hard work for you by generating the necessary JavaScript to interact with the service. All you have to do is register the service with the ScriptManager control and then call it from client-side code. Given the NameService you saw earlier, you set up the ScriptManager as follows: In this example, the service file is called NameService.svc and is located in a folder called WebServices in the root of your website.
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BEGINNING ASP.NET 4.5 FOREWORD . .
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BEGINNING ASP.NET 4.5 IN C# AND VB
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—To Niek
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CREDITS Acquisitions Editor Mary Ja
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CONTENTS FOREWORD INTRODUCTION xxxi
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CONTENTS Working with Files in Your
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CONTENTS Not All Controls Rely on V
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CONTENTS Skins 245 Creating a Skin
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CONTENTS Providing Feedback to User
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CONTENTS Single Item Controls 455 P
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CONTENTS Authentication: How Can Yo
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CONTENTS Introducing Bundling and M
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INTRODUCTION TO BUILD EFFECTIVE AND
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INTRODUCTION ‰ Chapter 4, “Work
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INTRODUCTION HOW THIS BOOK IS STRUC
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INTRODUCTION ‰ Code shown for the
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INTRODUCTION FIGURE I-2 The Site fo
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BEGINNING ASP.NET 4.5
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2 x CHAPTER 1 GETTING STARTED WITH
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34 x CHAPTER 2 BUILDING AN ASP.NET
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66 x CHAPTER 3 DESIGNING YOUR WEB P
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100 x CHAPTER 3 DESIGNING YOUR WEB
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4Working with ASP.NET Server Contro
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Introduction to Server Controls x 1
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Introduction to Server Controls x 1
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A Closer Look at ASP.NET Server Con
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A Closer Look at ASP.NET Server Con
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Types of Controls x 117 FIGURE 4-4
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Types of Controls x 119 The Smart T
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Types of Controls x 121 } DropDownL
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Types of Controls x 123 Container C
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Types of Controls x 125 Note that t
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Types of Controls x 127 FIGURE 4-12
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Types of Controls x 129 FinishButto
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Types of Controls x 131 FileUpload
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Types of Controls x 133 Validation
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The ASP.NET State Engine x 135 serv
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The ASP.NET State Engine x 137 FIGU
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The ASP.NET State Engine x 139 4. A
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Practical Tips on Working with Cont
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Summary x 143 ⊲ WHAT YOU LEARNED
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146 x CHAPTER 5 PROGRAMMING YOUR AS
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6Creating Consistent Looking Websit
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Consistent Page Layout with Master
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Using a Centralized Base Page x 219
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Themes x 229 With this exported tem
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Themes x 231 Replace Theme with Sty
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Themes x 233 type="text/css" rel=
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Themes x 235 ASP.NET themes are not
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Themes x 237 FIGURE 6-19 How It Wor
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Themes x 239 VB.NET Dim myCookie As
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Themes x 241 FIGURE 6-21 Within the
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Themes x 243 C# preferredTheme.Valu
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Skins x 245 a cookie called Preferr
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Skins x 247 3. In the Extension box
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Practical Tips on Creating Consiste
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Summary x 251 The imaginary CSS cla
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7Navigation WHAT YOU WILL LEARN IN
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Different Ways to Move Around Your
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Using the Navigation Controls x 257
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Programmatic Redirection x 277 Redi
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Programmatic Redirection x 279 How
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Practical Tips on Navigation x 281
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286 x CHAPTER 8 USER CONTROLS advan
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288 x CHAPTER 8 USER CONTROLS TRY I
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290 x CHAPTER 8 USER CONTROLS How I
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294 x CHAPTER 8 USER CONTROLS Note:
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296 x CHAPTER 8 USER CONTROLS ASP.N
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298 x CHAPTER 8 USER CONTROLS The c
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300 x CHAPTER 8 USER CONTROLS Image
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302 x CHAPTER 8 USER CONTROLS When
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304 x CHAPTER 8 USER CONTROLS If _n
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308 x CHAPTER 8 USER CONTROLS This
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310 x CHAPTER 8 USER CONTROLS ⊲ W
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312 x CHAPTER 9 VALIDATING USER INP
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Page 397 and 398: Using ASP.NET AJAX in Your Projects
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414 x CHAPTER 11 JQUERY As you saw
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416 x CHAPTER 11 JQUERY 7. Save you
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418 x CHAPTER 11 JQUERY look at jQu
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420 x CHAPTER 11 JQUERY ⊲ WHAT YO
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422 x CHAPTER 12 INTRODUCTION TO DA
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454 x CHAPTER 13 DISPLAYING AND UPD
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14 LINQ and the ADO.NET Entity Fram
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Introducing LINQ x 499 surprise tha
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Mapping Your Data Model to an Objec
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Introducing Query Syntax x 507 and
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Introducing Query Syntax x 509 Wher
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Introducing Query Syntax x 511 Firs
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Introducing Query Syntax x 513 diff
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Introducing Query Syntax x 515 Orde
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Using Server Controls with LINQ Que
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Summary x 551 model. Combined with
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15 Working with Data — Advanced T
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Formatting Your Controls Using Styl
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Handling Events x 563 background-im
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Handling Events x 565 4. Make sure
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Handling Events x 567 The PreRender
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Handling Events x 569 Button1_Click
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Handling Events x 571 Select Case e
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Handling Events x 573 The RowDataBo
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Handling Events x 575 These classes
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Handling Events x 577 8. Save all y
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Hand-Coding Data Access Code x 579
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Caching x 589 In all the database e
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Caching x 591 Output Caching With o
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Caching x 593 Programmatic Caching
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Caching x 595 ‰ SummaryLabel ‰
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Caching x 597 } font-style: italic;
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Caching x 599 expiration date, whic
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Summary x 601 EXERCISES 1. Imagine
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16 Security in Your ASP.NET 4.5 Web
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Introducing Security x 605 Authoriz
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Introducing the Login Controls x 60
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The Role Manager x 627 such as the
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The Role Manager x 629 1 . From wit
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The Role Manager x 631 FIGURE 16-19
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The Role Manager x 633 2. Save and
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The Role Manager x 635 Management s
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The Role Manager x 637 Alternativel
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The Role Manager x 639 } } case Lis
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Summary x 641 SUMMARY You can imple
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17 Personalizing Websites WHAT YOU
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Understanding Profile x 645 In the
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Understanding Profile x 647 You can
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Understanding Profile x 649 5. To t
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Understanding Profile x 651 To defi
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Understanding Profile x 653 press t
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Understanding Profile x 655 10. Dou
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Understanding Profile x 657 1. In M
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Understanding Profile x 659 e As Ev
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Understanding Profile x 661 That’
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Understanding Profile x 663 By clic
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Understanding Profile x 665 sent to
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Understanding Profile x 667 5. From
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Understanding Profile x 669 10. Ent
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Other Ways of Dealing with Profile
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Other Ways of Dealing with Profile
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Summary x 675 How It Works Much of
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680 x CHAPTER 18 EXCEPTION HANDLING
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730 x CHAPTER 19 DEPLOYING YOUR WEB
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786 x APPENDIX A EXERCISE ANSWERS D
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790 x APPENDIX A EXERCISE ANSWERS }
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BConfiguring SQL Server 2012 So far
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Configuring SQL Server 2012 x 795 C
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Configuring SQL Server 2012 x 797 Y
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Configuring SQL Server 2012 x 801 I
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Configuring SQL Server 2012 x 803 t
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Configuring Application Services x
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allowAnonymous attribute - ASP.NET
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Basic Settings mode - C# implementi
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ClientID property - complex events
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CreateUserUrl property - data Creat
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decimal data type - DynamicEnableDe
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European cookie law - external styl
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input controls - handling input co
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IIS:ASP.NET - interface IIS:ASP.NET
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Label control - logical operators L
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Microsoft Developer Network - New S
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PageWrapper element- PhotoAlbumId p
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Profile.GetProfile - ReadAllText me
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RoleGroups - server side configurin
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SQL statement - styling installing,
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text strings - types validation con
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validation controls- ViewState coll
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web services - Where clause flow of
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