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As we have mentioned, the purpose of this recipe and the sample code is not to make you an expert in authoring codecs but to make you familiar with the related MediaStreamSource extensibility mechanism in Silverlight. Keeping that in mind, the sample we discuss here may seem trivial from a decoder complexity perspective. But if you possess the codec-authoring skill set, we hope this recipe offers you some help in using that knowledge to build Silverlight managed decoders. Armed with what you have learned so far, let s look at building a relatively simple sample. The sample for this recipe has two parts. In the first part, you build a simple Silverlight component that records screenshots of a Silverlight application at a specific frame rate. The component uses the System.Windows.Media. Imaging.WriteableBitmap class to record the screenshots by capturing the root visual in the application s visual tree; it saves the bitmaps into a file on disk. For more information about WriteableBitmap, refer to 3. In the second part, you build a custom MediaStreamSource that reads this file and plays your recording as a video through a MediaElement. In an effort to keep the sample simple, we do not tackle audio streams in this sample the result is a silent movie of the recorded screen shots.

In this scenario, we will show how Silverlight can interact with business data calculations. We will challenge Silverlight to work with a large amount of data and see how the technology holds up under pressure. Following are the goals of this scenario: Understanding that Silverlight can work with very large data sets locally Gaining insight on how data can be manipulated quickly using LINQ locally Seeing how we can decouple business logic and reuse it in other locations

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It is an OO approach to the database records! But this is just one little step toward what OO developers would have from their classes The preceding example shows an automatic way to manage the database but contains a trick: the Visual Studio Dataset Designer generates SQL statements for you, but they are still in the class code! A purist doesn t want to see mixed code in the class A pure O/RM tool allows developers to manage data without worrying about how to retrieve the data Developers do not need to write any SQL code in their classes; they just manage classes and objects The following pseudo-code snippet illustrates what a pure O/RM should provide: Products p = new Products(); pProductID = 1; pRetrieve(); ConsoleWriteLine(pProductID + ", " + pName);.

The recorder component is implemented as a class named ScreenRecorder in a project named ScreenRecorderLib, as shown in Listing 8-28. Listing 8-28. Code for the ScreenRecorder Class using using using using using using using using using using using System; System.Collections.Generic; System.ComponentModel; System.IO; System.Linq; System.Runtime.Serialization; System.Threading; System.Windows; System.Windows.Media; System.Windows.Media.Imaging; System.Windows.Threading;

silverlightbusinessintelligence.com/Demos/SilvelightBIClient/WorkingWithBusinessData/ WorkingWithBusinessData.html.

The Retrieve imaginary method knows we are looking for the Product record that has the ProductID property equal to 1 and creates the SQL command for us, filling the Products class fields with the related values. It s really gorgeous, isn t it If you believe that the LINQ to SQL framework provides something similar to this pure O/RM code to manage a database, we have to inform you that this is only partially true. In fact, the LINQ to SQL framework provides basic O/RM functionality. As declared by Luca Bolognese (one of the creators of the LINQ to SQL framework) during a conference, LINQ to SQL has been provided with some basic O/RM features in the first release, and it will be expanded in future releases, thanks to feedback from the developers. In this chapter, you will see these features in action, and you will be able to use them in your projects. At the end of the chapter, you will have an idea of what the LINQ to SQL framework provides and what it doesn t yet offer.

namespace Ch08_RichMedia.Recipe8_7 { public class ScreenRecorder { private DispatcherTimer snapshotTimer = new DispatcherTimer();

O/RM is based on entities. An entity is a class that has its properties mapped to table columns. Usually, databases have a lot of tables and a lot of columns. An O/RM framework such as LINQ to SQL provides tools to generate entities automatically, so developers don t need to create them manually. The LINQ to SQL framework provides two tools for generating entities: SQLMetal and the LINQ to SQL Classes Designer in Visual Studio 2008. These tools generate the same entities with the same code. The big difference is that Visual Studio s LINQ to SQL Classes Designer allows you to choose which table to transform into an entity; the SQLMetal tool does not allow you to choose. SQLMetal generates all the entities analyzing all the tables contained in the database. Also, SQLMetal can produce .mdf, .sdf, or .dbml files. The LINQ to SQL Classes Designer produces only .dbml files. A .dbml file contains XML tags representing the database s structure.

In this step-by-step exercise, we are going to aggregate some data to perform analysis on a large data set of people. We are going to create a large data set of 1 million Person objects as our sample data. They will be our data sample for analysis. The analysis we are going to perform is going to center around the body mass index (BMI) scale.

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