Embed Size (px)
DESCRIPTION
Multiple Choices The smallest data item a computer can process is called a ________. –A. database B. byte C. file D. bit A group of related records is stored in a ____. –A. file B. field C. bit D. byte Data maintained in a file is called _____. –A. persistent data B. bits C. secondary data D. databases Methods from the ____ class can be used to write data to a file. –A. StreamReader B. WriteFile C. StreamWriter D. None of the above Namespace ____ provides the classes and methods you need to perform file processing. –A. System.IO B. System.Files C. System.Stream D. System.Windows.Forms A(n) ____ allows the user to select a file to open. –A. CreateFileDialog B. OpenFileDialog C. MessageBox D. SaveFileDialog 3
Citation preview
CSCI 3328 Object Oriented CSCI 3328 Object Oriented Programming in C# Programming in C#
Chapter 11: Files and Streams -- Chapter 11: Files and Streams -- ExercisesExercises
1
Xiang LianThe University of Texas Rio Grande Valley
Edinburg, TX [email protected]
Objectives
• In this chapter, you will do some exercises about:– Windows GUI– Classes File and Directory – LINQ queries to search through directories– sequential-access file processing– Classes FileStream, StreamReader, StreamWriter,
FileStream, and BinaryFormatter
2
Multiple Choices• The smallest data item a computer can process is called a ________.
– A. database B. byte C. file D. bit• A group of related records is stored in a ____.
– A. file B. field C. bit D. byte• Data maintained in a file is called _____.
– A. persistent data B. bits C. secondary data D. databases• Methods from the ____ class can be used to write data to a file.
– A. StreamReader B. WriteFile C. StreamWriter D. None of the above• Namespace ____ provides the classes and methods you need to perform
file processing.– A. System.IO B. System.Files C. System.Stream D. System.Windows.Forms
• A(n) ____ allows the user to select a file to open.– A. CreateFileDialog B. OpenFileDialog C. MessageBox D. SaveFileDialog
3
Multiple Choices (cont'd)• StreamReader method _____ reads a line from a file.
– A. ReadLine B. Read C. ReadAll D. ReadToNewline• A _____contains information that is read in the order it was written.
– A. sequential-access file B. StreamWriter C. StreamReader D. None of the above
• Methods from class _____ can be used to read data from a file.– A. StreamWriter B. FileReader C. StreamReader D. None of the
above• Ultimately, all data items processed by a computer are reduced to
combinations of _________.– A. 0-9 B. 'a'-'z' C. 'A'-'Z' D. 0's and 1's
• Method Serialize of class BinaryFormatter takes a(n) _______ and a(n) __________ as arguments.– A. object and Stream B. Stream and object C. File and object D.
object and File
4
True / False Statement• Creating instances of classes File and Directory is
impossible.• Typically, a sequential file stores records in order by
the record-key fields.• Class StreamReader inherits from class Stream.• Any class can be serialized to a file.• Classes StreamReader and StreamWriter are used
with sequential-access files.• The class BinaryFormatter is under the namespace
System.Runtime.Serialization.Formatters.Binary.
5
True / False Statement (cont'd)
• The ListBox control allows only a single selection (like a RadioButton).
• Controls such as form, GroupBox, Panel, and TabControl are all containers.
• All mouse events use the same event arguments class.• A ComboBox control typically has a drop-down list.• Deleting a parent node in a TreeView control deletes
its child nodes.
6
Writing the C# Code
• A student record has information such as student ID, last name, first name, birth year, and so on.– Declare a class for a student record– Write a method to write records into a file, using StreamWriter
– Write a method to read records from a file into a record array, using StreamReader
– Use an LINQ query to find those students with the birth year > 1981, and write them into another file using BinaryFormatter
7
8
