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CHAPTER 35 WINDOWS FORMS
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The code to populate the TreeView object is only a few lines: public void PopulateTree(TreeNodeCollection treeNodeCollection, DirectoryNode directoryNode) { TreeNode treeNode = new TreeNode(directoryNode.NameSize); treeNodeCollection.Add(treeNode); foreach (DirectoryNode subdir in directoryNode.GetDirectories()) { PopulateTree(treeNode.Nodes, subdir); } foreach (FileNode fileNode in directoryNode.GetFiles()) { TreeNode treeFileNode = new TreeNode(fileNode.NameSize); treeNode.Nodes.Add(treeFileNode); } } This is a recursive function. It adds a TreeNode instance to the collection for the current level and then recurses to add all the subdirectories under this directory as children of this directory. It then adds entries for all the FileNode objects in this directory. The FileNode object was added to encapsulate functions dealing with files primarily the NameSize property that returns the properly formatted string for this file. When this code is run, it generates the window (after expanding all the nodes) shown in Figure 35-3.
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Figure 35-3. DiskDiff view of directory tree
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CHAPTER 35 WINDOWS FORMS
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The FolderBrowserDialog class allows a directory to be selected in a standard Windows manner, as shown in Figure 35-4.
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Figure 35-4. Browsing for a directory to scan The following is the code to display and use FolderBrowserDialog: FolderBrowserDialog dialog = new FolderBrowserDialog(); dialog.ShowNewFolderButton = false; if (dialog.ShowDialog() == DialogResult.OK) { directoryNodeBaseline = null; rootDirectory = dialog.SelectedPath; DoTree(); } This code has a slight problem, however. If the root directory c:\ is entered, it will take the code quite a while to fetch all the information, and the program will appear to hang. That s bad.
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The first step is to indicate to the user that something is happening. One option is to add a ProgressBar control to the program. The problem with doing this is that you don t know how many files you ll need to process, so it s difficult to know what the endpoint of the process should mean. This means that either the progress bar will complete many times or it will never complete, which may be misleading to the user.
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CHAPTER 35 WINDOWS FORMS
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Another option is to indicate some directory or file information in the status bar. To start, drag a StatusBar control from the Toolbox to the form, and set the initial text of the status bar to an empty string so there isn t any text displayed to start. The next thing to do is to figure out how to update the StatusBar control when the directories are being scanned. You can do this in two ways. The first is to change the DirectoryNode.Populate() member so it takes a StatusBar as a parameter and have it change the text in the StatusBar directly. That works fine, but it means the DirectoryNode class needs to know how the program wants to handle updating information. It s not a very general implementation. The second option is to have the DirectoryNode class support an event that s fired whenever a file or directory is scanned. Since that s a bit nicer, that s what we ll show how to do for this example. A downside of this approach is that you ll need two event fields in each DirectoryNode object, even though only the root will ever have events hooked to it.2 The first step is to define a class that will carry the event information: public class ScannedItemEventArgs: EventArgs { string name; public ScannedItemEventArgs(string name) { this.name = name; } public string Name { get { return name; } } } By convention, EventArgs is used as a base class for any class passing information for an event. The next step is to add a delegate to DirectoryNode: public delegate void ScannedEventHandler(object sender, ScannedItemEventArgs e); Then, you ll declare two events: one for a directory being scanned and one for a file being scanned: public event ScannedEventHandler DirectoryScanned; public event ScannedEventHandler FileScanned; Finally, you ll add functions to fire the events. Having separate functions for these isn t strictly necessary, but they make the class a bit easier to use and easier to derive from. The event framework is now ready. The next step is to modify the code in Populate() so it fires the events. An interesting subtlety exists here. The class that uses the events will hook up
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