.NET/ASP.NET/C#/VB.NET PDF Document SDK

The next step is to build a list of files grouped by name. We define a couple of classes for this, shown in Example 11-3. We create a FileNameGroup object for each distinct filename. Each FileNameGroup contains a nested list of FileDetails, providing the full path of each file that has that name, and also the size of that file.

class FileNameGroup { public string FileNameWithoutPath { get; set; } public List<FileDetails> FilesWithThisName { get; set; } } class FileDetails { public string FilePath { get; set; } public long FileSize { get; set; } }

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lthough Qt started as a tool for developing cross-platform applications with graphical user interfaces, the toolkit has expanded into a tool useful for building all types of software command-line applications, embedded software, and graphical user interfaces for heavy workstation applications. The historical roots show as Qt makes it really easy to create a graphical user interface and build an application around it. This chapter goes from the original idea all the way to a working application in a few easy steps.

For example, suppose the program searches two folders, c:\One and c:\Two, and suppose both of those folders contain a file called Readme.txt. Our list will contain a FileNameGroup whose FileNameWithoutPath is Readme.txt. Its nested FilesWithThis Name list will contain two FileDetails entries, one with a FilePath of c:\One \Readme.txt and the other with c:\Two\Readme.txt. (And each FileDetails will contain the size of the relevant file in FileSize. If these two files really are copies of the same file, their sizes will, of course, be the same.) We build these lists in the InspectDirectories method, which is shown in Example 11-4. This contains the meat of the program, because this is where we search the specified directories for files. Quite a lot of the code is concerned with the logic of the program, but this is also where we start to use some of the file APIs.

private static List<FileNameGroup> InspectDirectories( bool recurseIntoSubdirectories, IEnumerable<string> directoriesToSearch) { var searchOption = recurseIntoSubdirectories SearchOption.AllDirectories : SearchOption.TopDirectoryOnly; // Get the path of every file in every directory we're searching. var allFilePaths = from directory in directoriesToSearch from file in Directory.GetFiles(directory, "*.*", searchOption) select file; // Group the files by local filename (i.e. the filename without the // containing path), and for each filename, build a list containing the // details for every file that has that filename. var fileNameGroups = from filePath in allFilePaths let fileNameWithoutPath = Path.GetFileName(filePath) group filePath by fileNameWithoutPath into nameGroup select new FileNameGroup { FileNameWithoutPath = nameGroup.Key, FilesWithThisName = (from filePath in nameGroup let info = new FileInfo(filePath) select new FileDetails { FilePath = filePath, FileSize = info.Length }).ToList() }; } return fileNameGroups.ToList();

To get it to compile, you ll need to add:

You then put the theory into practice by looking at several examples First you looked at simple data binding where a DataSource control isn t used and your Atlas controls are simply bound to a back-end web service Next you looked at binding a ListView control to a set of data and how you can use it to render a large snapshot of data asynchronously to your page Finally, I presented an example of using the ItemView control, and you learned about displaying the data on a web page and providing a user interface that allows for data entry, where you write data back to the service that provided it without going through an intermediary In addition, you used data protection, controlling access to the write cycles upon the readiness and dirtiness of the local data cache.

When developing software, it is always good to have a plan a sketch that shows what it is that you are trying to achieve. The goal of this chapter is a very simple phone book that holds a list of contacts and phone numbers. The graphical user interface, UI from here on, will be built around two dialogs: one for showing the list and available actions, and one for editing contacts. Figure 2-1 shows an early draft of the two dialogs.

using System.IO;

The parts of Example 11-4 that use the System.IO namespace to work with files and directories have been highlighted. We ll start by looking at the use of the Directory class.

Our InspectDirectories method calls the static GetFiles method on the Directory class to find the files we re interested in. Example 11-5 shows the relevant code.

var searchOption = recurseIntoSubdirectories SearchOption.AllDirectories : SearchOption.TopDirectoryOnly; // Get the path of every file in every directory we're searching. var allFilePaths = from directory in directoriesToSearch from file in Directory.GetFiles(directory, "*.*", searchOption) select file;