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Now that you have the directory code, you need to sum the sizes of the files for a directory and then pass that size up to the parent directories. You ll want to be able to fetch both the size of this directory and the size of this directory and the subdirectories under it. For this, you ll add two properties: long size = null; long sizeTree = null; public long Size { get { if (size == null) { size = 0; // size of dir in bytes // size of dir and subdirs
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foreach (FileNode f in files) { size += f.fileInfo.Length; } } return(size); } } public long SizeTree { get { if (sizeTree == null) { sizeTree = 0; sizeTree += Size; foreach (DirectoryNode dirNode in dirs) { sizeTree += dirNode.SizeTree; } } return(sizeTree); } } The Size property simply walks through all the files in the current node and adds their sizes. This total size is then stored in the size variable so it doesn t need to be recalculated. The SizeTree property adds the size of all the subdirectories to the current size. Because SizeTree recourses down the tree, getting the value of the property at the root will cause the sizes to be calculated all the way down the tree. Although this is a nice way to use properties, it may turn out that calculating the sizes during the call to Populate() is a better choice. The PrintTree() is renamed to PrintSizes() and now prints out the values of Tree and TreeSize next to the name of the directory. Running the code produces the following output: c:\project\diskdiff 32632 119672 c:\project\diskdiff\bin 0 43520 c:\project\diskdiff\bin\Debug 43520 43520 c:\project\diskdiff\obj 0 43520 c:\project\diskdiff\obj\Debug 43520 43520 c:\project\diskdiff\obj\Debug\temp 0 0 c:\project\diskdiff\obj\Debug\TempPE 0 0 Now it s time to integrate the directory traversal code into the TreeView class.
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Though a separate DirectoryNode.cs file is part of the example, the class was written in the main project. For testing purposes, we wanted to print the traversal of a big directory, but since DiskDiff is a Windows Forms project, it doesn t have a console window. However, a Windows Forms project can have a console window. By right-clicking the project in the Solution Explorer and choosing Properties, you can change the output type of the project to Console Application. This means you ll have to dismiss the console window when exiting the application, but that s fine for debugging. When you re finished, just change the output type of the project back, and the console window will go away.
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You must now decide how to interface the form and the DirectoryNode classes so the tree can be populated. One option is to have DirectoryNode expose enough of its internals (perhaps through an indexer) so the form can iterate over it. Another option is to pass the TreeView control to a function in DirectoryNode and have it populate the control. A trade-off exists between having DirectoryNode expose a more complex interface and having DirectoryNode be more tightly coupled to the form. In this case, we ll choose the first option, but the second option can sometimes be better, especially if the processing to be done is complex. Because a directory can be thought of as an array of files, an indexer is a reasonable choice. However, you need to differentiate between directories and files, so doing what the Directory class does, with GetFiles() and GetDirectories() members, is a better choice. Rather than return the collection held by DirectoryNode, a copy of the collection is made, sorted, and returned. This allows the UI to make any modifications it needs to the collection without affecting other objects that might be using the same DirectoryNode instance. The code for these functions is as follows: public DirectoryNode[] GetDirectories() { DirectoryNode[] array = dirs.ToArray(); Array.Sort(array); return (array); } public FileNode[] GetFiles() { FileNode[] array = files.ToArray(); Array.Sort(array); return (array); } This is a good example of how garbage collection can simplify interaction between different objects; in C++, you d have to carefully consider the question of who owned the objects in the returned array.
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