Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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664 x CHAPTER 17 PERSONALIZING WEBSITES Because the data source of the nested Repeater you added to the Default.aspx page is a collection of Review instances, it has been made strongly typed by setting its ItemType and using its Item property as opposed to using Eval. As you learned previously, this makes it easier to write code and catch errors earlier. The nested Repeater looks a bit like the code for the AllByGenre.aspx page that has a Repeater that contains a BulletedList control. Just as in that page, the nested Repeater gets its data from the outer Repeater with the DataSource attribute: ... The nested Repeater then uses the list of Reviews to build up the hyperlinks that take you to the details page: The HyperLink control gets its Text from the Review instance that it’s bound to and uses its Id to build up the NavigateUrl. The ToString method is used on Item.Id to convert the value to a string before it’s concatenated to the string that contains the URL. This is done to avoid type conversions in Visual Basic where Item.Id normally results in a number that you can’t concatenate to a string directly. As an alternative, if you’re following along in VB.NET, you could have used the & character to concatenate the value. To see how these controls get their data, you need to look at the Code Behind that uses a LINQ query targeting the Entity Framework: VB.NET Dim favGenres = From genre In myEntities.Genres.Include("Reviews") Order By genre.Name Where Profile.FavoriteGenres.Contains(genre.Id) Select New With {genre.Name, genre.Reviews} C# var favGenres = from genre in myEntities.Genres.Include("Reviews") orderby genre.Name where Profile.FavoriteGenres.Contains(genre.Id) select new { genre.Name, genre.Reviews }; Except for the highlighted line of code and the variable name, this LINQ query is identical to the one used in AllByGenre.aspx. What makes this example special is the Where clause that limits the number of reviews to those that the user is really interested in. Note how the Contains method of the generic List class is used here. Although at first it may seem that all genres and reviews are retrieved from the database into the ASPX page and then compared with the values in the profile property called FavoriteGenres, the reverse is actually the case. The Entity Framework is smart enough to collect all the IDs from the FavoriteGenres property first and then include them in the SQL statement that is
Understanding Profile x 665 sent to the database to fetch the requested genres and reviews. This means that filtering of the requested genres takes place at the database level, and not in the ASPX page. This in turn means that fewer rows are transferred from the database to the ASPX page (only those that are really needed), which results in better performance. The profile property FavoriteGenres returns an empty list, rather than throwing an exception for anonymous users. So, even users with no profile can safely view this page. Instead of seeing any reviews, they get a message stating they haven’t set their genre preferences yet, or that they need to log in first. In the end of the Page_Load handler, some code determines whether to show or hide the Repeater and the NoRecords controls: VB.NET GenreRepeater.Visible = GenreRepeater.Items.Count > 0 NoRecords.Visible = Not GenreRepeater.Visible C# GenreRepeater.Visible = GenreRepeater.Items.Count > 0; NoRecords.Visible = !GenreRepeater.Visible; If after data binding the outer Repeater, its Items collection is still empty, it means no genres were found for the current user. If that’s the case, the entire Repeater is hidden and the PlaceHolder is shown. However, if the Count property of the Items collection is larger than zero, the Repeater is made visible and the PlaceHolder is hidden. In Chapter 14, you created a page called NewPhotoAlbum.aspx that lets users insert new Gig Pics albums. The current implementation of this page has a few shortcomings. First of all, anyone can insert a new album. There’s no way to block anonymous users from creating a new album and uploading pictures. Secondly, only Managers can remove pictures from an existing photo album. It would be nice if the owner of an album could also remove her own pictures. Now that you know more about security and personalizing web pages, this is pretty easy to implement, as you see in the following exercise. TRY IT OUT Letting Users Manage Their Own Photo Albums In this Try It Out you see how to block the NewPhotoAlbum.aspx and ManagePhotoAlbum.aspx pages from unauthenticated users. Additionally, you see how to record the name of the user who created the photo album and use that name later on to enable users to alter their own photo albums. 1. Open SQL Server Management Studio from the Windows Start menu or Start screen. Open your PlanetWrox database, and locate the PhotoAlbum table. Right-click it and choose Design. Add a new column called UserName, set its data type to nvarchar(256), and leave the Allow Nulls option selected. (This table already contains photo albums without a valid UserName, so you can’t make the column required at this stage unless you delete these photo albums and their related
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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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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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312 x CHAPTER 9 VALIDATING USER INP
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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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392 x CHAPTER 11 JQUERY In addition
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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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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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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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BConfiguring SQL Server 2012 So far
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Configuring SQL Server 2012 x 795 C
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allowAnonymous attribute - ASP.NET
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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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validation controls- ViewState coll
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web services - Where clause flow of
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