Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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504 x CHAPTER 14 LINQ AND THE ADO.NET ENTITY FRAMEWORK The page looks rather messy because of the way the data is presented in the GridView, but in later exercises you see how to improve the layout of the grid and the data. FIGURE 14-4 How It Works EF comes with an object-relational designer (accessible in VS) that enables you to create an object model that is accessible through code based on the tables in your database. By adding tables to this designer, VS generates code for you that enables you to access the underlying data in the database without writing a lot of code. The classes that are added to the designer are stored in the .edmx file and its Code Behind files. The designer file (the Code Behind of the PlanetWrox.edmx file) contains a class that inherits from ObjectContext, the main object in EF that provides access to your database. In the preceding exercise, this class is called PlanetWroxEntities (named after the .edmx file) and you use it to access the data in the tables you added to the diagram. Although you normally don’t need to look at the generated code, you can open the file PlanetWrox.designer.vb or PlanetWrox.designer.cs file and see what code has been generated for you. The *.tt files you deleted enable you to customize the code that is generated based on the underlying data model. However, in most cases you don’t have to do this, and you can rely on the default code generation instead. That’s why you deleted these files, and configured the EF model to use its default code generation strategy. The designer is smart enough to detect the relationships in the database and is thus able to create the necessary relationships in code as well, as you saw in Figure 14-2. The model defines two main object types, Review and Genre, both of which also have collection counterparts called Reviews and Genres, respectively. These collections are referred to as entity sets. Note that on English versions of VS the designer has correctly pluralized the names of the Review and Genre tables (Reviews and Genres, respectively), making it easier to see what is a collection (Reviews) and what is a single instance of an object (Review). For other language versions of VS, you had to apply this logic yourself using the Entity Designer. After the model has been generated, you can execute LINQ queries against it to get data out of the underlying database. To access the data, you need an instance of the ObjectContext class, which is created inside the Using block in the code. A Using block (using in C#) is used to wrap code that creates a variable that must be disposed of (cleared from memory) as soon as you’re done with it. Because
Mapping Your Data Model to an Object Model x 505 the myEntities variable holds a (scarce) connection to the SQL Server database, it’s a good idea to wrap the code that uses it in a Using block, so the object is destroyed at the end of the block and the connection is released. This myEntities object then exposes your data (such as reviews and genres) that you can use in a query: VB.NET Using myEntities As New PlanetWroxEntities() Dim authorizedReviews = From review In myEntities.Reviews Where review.Authorized = True Order By review.CreateDateTime Descending Select review ... End Using C# using (PlanetWroxEntities myEntities = new PlanetWroxEntities()) { var authorizedReviews = from review in myEntities.Reviews where review.Authorized == true orderby review.CreateDateTime descending select review; ... } Note that this query looks similar to the SQL that you learned in the previous chapters. Under the hood, the run time converts this LINQ query into its SQL counterpart and executes it against the underlying database. Within this query, the variable review in the From clause is used to refer to the review in the other parts of the query (Where, Order By, and Select), enabling you to specify the select, filter, and ordering criteria. What’s important to realize is that EF uses a mechanism called lazy loading, which means sub objects are not loaded until you explicitly tell them to. What this means is that in the previous example the Genre properties of the Review objects you’ve queried are null in C# and Nothing in VB.NET and don’t contain any data. As soon as your code tries to access them, they are loaded by executing another query to the database. This can greatly improve performance if you don’t need these sub objects. However, if you’re sure you need them in your code beforehand, executing a separate SQL statement for each item results in a lot of overhead. In that case, you can preload the objects with the initial query. To express that you want to include these objects as well, you use the Include method for the types you want to query: VB.NET Dim authorizedReviews = From review In myEntities.Reviews.Include("Genre") Where review.Authorized = True ... C# var authorizedReviews = from review in myEntities.Reviews.Include("Genre") where review.Authorized == true ... With this addition to the query, the Review objects now have their Genre property correctly filled with data. Though this may seem a little counterintuitive and counterproductive at first, it’s actually quite
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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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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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286 x CHAPTER 8 USER CONTROLS advan
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10 ASP.NET AJAX WHAT YOU WILL LEARN
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Using ASP.NET AJAX in Your Projects
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Using Web Services and Page Methods
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386 x CHAPTER 11 JQUERY Fortunately
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388 x CHAPTER 11 JQUERY FIGURE 11-1
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390 x CHAPTER 11 JQUERY This lists
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406 x CHAPTER 11 JQUERY jQuery goes
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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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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 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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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 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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Summary x 675 How It Works Much of
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680 x CHAPTER 18 EXCEPTION HANDLING
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768 x APPENDIX A EXERCISE ANSWERS E
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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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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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input controls - handling input co
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Microsoft Developer Network - New S
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Profile.GetProfile - ReadAllText me
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SQL statement - styling installing,
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text strings - types validation con
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