C# in Depth

282 CHAPTER 11 Query expressions and LINQ to Objects11.1.3 Defining the sample data modelIn section 10.3.5 I gave a brief example of bug tracking as a real use for extensionmethods and lambda expressions. We’ll use the same idea for almost all of the samplecode in this chapter—it’s a fairly simple model, but one that can be manipulated inmany different ways to give useful information. It’s also a domain that most professionaldevelopers are familiar with, while not involving frankly tedious relationshipsbetween customers and orders. You can find further examples using the same modelin the downloadable source code, along with detailed comments. Some of these aremore complicated than the ones presented in this chapter and provide good exercisesfor understanding larger query expressions.Our fictional setting is SkeetySoft, a small software company with big ambition. Thefounders have decided to attempt to create an office suite, a media player, and an instantmessaging application. After all, there are no big players in those markets, are there?The development department of SkeetySoft consists of five people: two developers(Deborah and Darren), two testers (Tara and Tim), and a manager (Mary). There’scurrently has a single customer: Colin. The aforementioned products are SkeetyOffice,SkeetyMediaPlayer, and SkeetyTalk, respectively. We’re going to look at defectslogged during August 2007, using the data model shown in figure 11.3.Figure 11.3Class diagram of the SkeetySoft defect data modelLicensed to Rhona Hadida