Beginning ASP.NET 4.5 in CSharp and VB Opsylum

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550 x CHAPTER 14 LINQ AND THE ADO.NET ENTITY FRAMEWORK The other potential performance problem lies in the way the data is paged. With the DataPager control, the data is paged inside the ASPX page. That means that all data is retrieved from the database and sent to the EntityDataSource control. The DataPager control then selects the right rows to display on the current page. This works fine for result sets of up to hundreds of rows. However, as soon as the number of items in a photo album or other collection grows above that number, you may find that your pages start to slow down. If that’s the case, you may want to look at paging at the database level. The ADO.NET Entity Framework supports this scenario using the Skip() and Take() methods you’ve seen before. PRACTICAL LINQ AND ADO.NET ENTITY FRAMEWORK TIPS Here are some practical LINQ and ADO.NET Entity Framework tips: ‰ In this chapter you saw how to create anonymous types to shape the data you want to return from your queries. The compiler and IntelliSense are invaluable tools in determining what data you can return and what properties you have available. Spend some time playing around with the anonymous types, looking at the different options that the IntelliSense lists give you. ‰ Just as with other data access methods, like the SqlDataSource control you saw in the previous chapter, try to filter your data as much as possible. If you know you only need reviews in the Jazz genre, be explicit and incorporate a Where clause in your code or EntityDataSource control that limits the list of reviews at the database level. This speeds up your queries and data retrieval, improving the overall speed of the application. ‰ Make use of anonymous types to decrease the memory consumption of your LINQ queries. For example, instead of retrieving the entire Review object, use the New (new in C#) keyword to create a new anonymous type on the fly. Because this new object contains only the properties you really need, you save yourself the overhead of bringing in the full object. SUMMARY LINQ is a compelling and exciting technology that ships with .NET. LINQ is an important plumbing technique in many data access scenarios, including database access in ASP.NET web applications using the ADO.NET Entity Framework. Because LINQ is so important, it has been integrated in many different places in .NET. LINQ is available for objects enabling you to query in-memory collections. Additionally, LINQ is available for XML, ADO.NET, and DataSets, each type providing access to a different data store, but with the same, unified querying language. LINQ is also used as the query language for the ADO.NET Entity Framework. To work with EF in your ASP.NET web applications you have a couple of different options. First, you can write queries in the Code Behind of a page and then bind the results to a data-bound control using the DataSource property and DataBind method of the control. Alternatively, you can use the EntityDataSource control that serves as the bridge between your data-bound controls and your
Summary x 551 model. Combined with the new ListView and DataPager controls, the EntityDataSource enables you to create fully functional CRUD pages. Until now, the database-driven pages you have seen look quite dull. You haven’t applied a lot of styling, or provided any conditional formatting, where data is presented differently based on its values. You can do this through control styles and the many events of the data-bound and data source controls. The next chapter shows you how to make use of these styles and events. EXERCISES 1. Imagine you have a page in the Reviews folder called MostRecent.aspx. This page should show the 10 most recently added reviews. What would your LINQ query look like if you only wanted to show the review’s Title property and the name of the genre it belongs to? You should use the Take method to limit the result set to 10. If you’re having trouble writing the code to get the last reviews, look at the section titled “First, FirstOrDefault, Last, and LastOrDefault,” which shows you how to get the last review in the database. 2. What is the major benefit of the ListView control over other data controls like GridView and Repeater? 3. Currently the Default.aspx page from the PhotoAlbums folder just shows the thumbnails of the pictures. What would you need to do to display the full-size picture on its own page using a LINQ query? 4. When you delete a picture from the ListView on the Photo Album page, only the database row is deleted, but the image on disk is left untouched. Make use of the static System.IO.File.Delete method to delete the item from disk. Choose an appropriate event of the EntityDataSource to handle this and make use of the Entity property that is available on the e argument of the event. 5. Currently, the AllByGenre.aspx page displays the title of the genre, regardless of whether it has any reviews attached to it. How can you hide genres that don’t have any reviews? Make use of the Count method on the Reviews collection to solve this question. You can find answers to these exercises in Appendix A.
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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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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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6Creating Consistent Looking Websit
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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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7Navigation WHAT YOU WILL LEARN IN
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Using the Navigation Controls x 257
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10 ASP.NET AJAX WHAT YOU WILL LEARN
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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 631 FIGURE 16-19
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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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BConfiguring SQL Server 2012 So far
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allowAnonymous attribute - ASP.NET
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