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{ // An error occurred when calling GetFiles(). // Ignore this error and leave the entries collection empty. } return entries; } private BookEntry GetEntryFromFile(FileInfo entryFile) { // Turn the file information into a Book Entry object. BookEntry newEntry = new BookEntry(); StreamReader r = entryFile.OpenText(); newEntry.Author = r.ReadLine(); newEntry.Submitted = DateTime.Parse(r.ReadLine()); newEntry.Message = r.ReadLine(); r.Close(); return newEntry; } private void SaveEntry(BookEntry entry) { // Create a new file for this entry, with a file name that should // be statistically unique. Random random = new Random(); string fileName = guestBookName + @"\"; fileName += DateTime.Now.Ticks.ToString() + random.Next(100).ToString(); FileInfo newFile = new FileInfo(fileName); StreamWriter w = newFile.CreateText(); // Write the information to the file. w.WriteLine(entry.Author); w.WriteLine(entry.Submitted.ToString()); w.WriteLine(entry.Message); w.Close(); } }

HasExtension() IsPathRooted()

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Suppose you work for a phone company with a lot of resellers who are responsible for billing their clients directly. You need to provide a way for your resellers to get access to their subscribers call records, and you need to do it in a universal way because your resellers use different programming languages in their systems. Enter WSDL and complex types. The data you want to provide is all the calling information for a specific subscriber: start time, duration, caller (the phone number from which the call was placed), and the callee (the dialed number). You could just provide a generic array type as a return value in your WSDL, but then your resellers wouldn t know which key names to expect and would need to do extra iterations to convert the result to an object format. With complex types, you can provide an objectmappable data type, as well as an array of records of that type.

The code uses text files so you can easily review the information on your own with Notepad. You could use binary files just as easily, which would save a small amount of space. The file name for each entry is generated using a combination of the current date and time (in ticks) and a random number. Practically speaking, this makes it impossible for a file to be generated with a duplicate file name. This program uses error handling to defend against possible problems. However, errors are handled in a different way depending on when they occur. If an error occurs when saving a new entry in the cmdSubmit_Click() method, the user is alerted to the problem, but the display is not updated. Instead, the usersupplied information is left in the controls so the save operation can be reattempted. When reading the existing files in the cmdGetAllEntries_Click()

The Directory and File classes provide a number of useful shared methods. Table 18-2 and Table 18-3 show an overview of the most important methods. Most of these methods take the same parameter: a fully qualified path name identifying the directory or file you want the operation to act on. A few methods, such as Delete() and Move(), take additional parameters.

method, two problems can occur, and they re dealt with using separate exception blocks. A problem can happen when the code calls GetFiles() to retrieve the file list. In this situation, the problem is ignored but no files are found, and so no guest book entries are shown. If this step succeeds, a problem can still occur when reading each file in the GetEntryFromFile() method. In this situation, the file that caused the problem is ignored, but the code continues and attempts to read the remaining files.

CreateDirectory()

Note The error handling code in this example does a good job of recovering from the brink of disaster and

Creates a new directory. If you specify a directory inside another nonexistent directory, ASP.NET will thoughtfully create all the required directories. Deletes the corresponding empty directory. To delete a directory along with its contents (subdirectories and files), add the optional second parameter of True. Returns True or False to indicate whether the specified directory exists. Returns a DateTime object that represents the time the directory was created, accessed, or written to. Each GetXxx() method has a corresponding SetXxx() method, which isn t shown in this table. Returns an array of strings, one for each subdirectory or file (depending on the method you re using) in the specified directory. These methods can accept a second parameter that specifies a search expression (such as ASP*.*). Returns an array of strings, one for each drive that s defined on the current computer. Drive letters are in this format: c:\ . Parses the supplied directory string and tells you what the parent directory is. You could do this on your own by searching for the \ character (or, more generically, the Path.DirectorySeparatorChar), but this function makes life a little easier.

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