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In this chapter, you took a somewhat detailed look at some of the collections made available by the .NET Framework class library. You started by looking at the IEnumerable interface, which is common to most collections. Next, you covered all the common collections. You then examined a few of the more specialized collections provided by the .NET Framework class library. You finished by examining the generic type collections, which are new to .NET version 2.0. In the next chapter, you re going to look at how the .NET Framework addresses the important areas of file I/O.

One limitation of the previous example is that it won t pick up changes you make to the collection. It notices changed Product objects, but it won t update the list if you add a new item or remove one through code. For example, imagine you add a Delete button that executes this code: Private Sub cmdDeleteProduct_Click(ByVal sender As Object, _ ByVal e As RoutedEventArgs) products.Remove(CType(lstProducts.SelectedItem, Product)) End Sub The deleted item is removed from the collection, but it remains stubbornly visible in the bound list. To enable collection change tracking, you need to use a collection that implements the INotifyCollectionChanged interface. Most generic collections don t, including the List collection used in the current example. In fact, WPF includes a single collection that uses INotifyCollectionChanged: the ObservableCollection class.

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This example requires that a user enter a comment before checking code in. All in all this is probably the most useful check-in policy ever, as we are notorious for not entering comments! Listing 3-3 shows the code for the empty comment check-in policy.

ost programs are of little use if there is no way of retrieving input from some source and outputting it to the same or another source. You have several options available for handling input/output (I/O). In this chapter, you will examine file and directory I/O, I/O manipulation, and finally, serialization or the process of storing the state of an object or member to a permanent medium. There are other I/O mechanisms. For example, this book covers databases, XML, and GUI interfaces in later chapters. Before you get to these more complex I/O systems, you ll start with simple files. Files are the core of most I/O-related activities in a program. The first thing you need to look at is the file system. Anybody who plays (oops, I mean works) on a computer sees the file system as an uncomplicated means of placing files wherever he wants them. Usually, the file system is taken for granted. Truthfully, the file system is anything but simple and, without the .NET Framework class library, a developer would see just how complicated it really is. Once you have the file system under your belt, you will end this chapter with serialization. Serialization is the process of storing a class to the file system for later retrieval. You will see how unbelievably easy this is to do with the .NET Framework class library.

s Note If you have an object model that you re porting over from the Windows Forms world, you can use the Windows Forms equivalent of ObservableCollection, which is BindingList. The BindingList collection implements IBindingList instead of INotifyCollectionChanged, which includes a ListChanged event that plays the same role as the INotifyCollectionChanged.CollectionChanged event. In addition, you can derive from BindingList to gain additional features for sorting and item creation in the Windows Forms DataGridView control.

Procedurally, there really isn t much to customizing Windows services. You simply override the handlers provided by ServiceProcess::ServiceBase, which you inherited from automatically when creating a Windows service from the Visual Studio 2005 template. (Of course, the features you want to implement within the Windows service can be any level of complexity.) Since creating Windows services is basically the same process, I can get away with a very simple example the logging of all events sent to the Windows service from the SCM. But before we do this, let s drag and drop an EventLog control from the components section of the toolbox to the SimpleWinService.h Design view. Once the EventLog icon is on the Design view, click it to enable the Properties window. Right-click the Log property drop-down and then select Application (since you are not logging errors or security info). Finally, in the Source property, enter SimpleWinService. Now, a few additional lines of code are added to your template, and you are ready to create system event logs using the following command: eventLog1->WriteEntry("An system event log message go here");

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