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simulates the experience of taking a certification exam, or you can set it up in study mode so that you can look at the correct answers and explanations after you answer each question.
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Practice tests For details about all the practice test options available, see the How to Use the Practice Tests section in this book s Introduction.
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Input/Output (I/O)
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In this chapter, you will learn how to work with the input/output (I/O) system within the Microsoft .NET Framework. The basics of the I/O system include accessing files and folders in the file system, working with read and write streams, using compression streams, and using isolated storage.
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Exam objectives in this chapter:
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Access files and folders by using the File System classes. (Refer System.IO namespace)
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File class and FileInfo class Directory class and DirectoryInfo class DriveInfo class and DriveType enumeration FileSystemInfo class and FileSystemWatcher class Path class ErrorEventArgs class and ErrorEventHandler delegate RenamedEventArgs class and RenamedEventHandler delegate FileStream class Stream class (not Reader and Writer classes because they are a separate objective) MemoryStream class BufferedStream class
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Manage byte streams by using Stream classes. (Refer System.IO namespace)
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Manage the .NET Framework application data by using Reader and Writer classes. (Refer System.IO namespace)
StringReader class and StringWriter class TextReader class and TextWriter class StreamReader class and StreamWriter class BinaryReader class and BinaryWriter class
2
Input/Output (I/O)
Compress or decompress stream information in a .NET Framework application (refer System.IO.Compression namespace) and improve the security of application data by using isolated storage. (Refer System.IO.IsolatedStorage namespace)
IsolatedStorageFile class IsolatedStorageFileStream class DeflateStream class GZipStream class
Lessons in this chapter:
Lesson 1: Navigating the File System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 Lesson 2: Reading and Writing Files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Lesson 3: Compressing Streams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114 Lesson 4: Working with Isolated Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Before You Begin
To complete the lessons in this chapter, you should be familiar with Microsoft Visual Basic or C# and be comfortable with the following tasks:
Create a console application in Microsoft Visual Studio using Visual Basic or C#. Add references to system class libraries to a project. Create text files.
Real World
Shawn Wildermuth I ve written hundreds, if not thousands, of lines of code and invariably I come back to the I/O system for lots of it. The I/O section of the .NET Framework provides help for doing a myriad of tasks. Much of what is in the I/O system is the basis for other parts of the Framework as well as for third-party products. Learning the basics of how streams and files work has made doing my job much easier.
Lesson 1: Navigating the File System
Lesson 1: Navigating the File System
In the everyday work of developers, one of the most common tasks is to work with the file system. This task includes navigating and gathering information about drives, folders, and files as well as waiting for changes to happen in the file system.
After this lesson, you will be able to:
Write code that uses the File and FileInfo classes. Write code that uses the Directory and DirectoryInfo classes. Use the DriveInfo and DriveType classes. Enumerate files, directories, and drives using the FileSystemInfo derived classes. Use the Path class to manipulate file system paths. Watch for changes in the file system using the FileSystemWatcher class.
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