Deck 13: Working with Files

Question 1

The GetAttributes( )method of the File class returns a FileAttribute,like Archive,when it invoked.

Answer 1

True

Question 2

If an invalid path is listed in the constructor for the StreamWriter object,you will be prompted to reenter the file name.

Answer 2

False

Question 3

Prior to writing program statements that access data in a file,you should always check to make sure the file is available using the Available( )method.

Answer 3

False

Question 4

If you use Visual Studio and include a reference to the System.IO namespace,IntelliSense provides helpful information while you are developing your file application.

Question 5

The constructor for the StreamWriter can include additional arguments indicating whether the file should be appended to or overwritten if it already exists.

Question 6

In order to invoke the Copy( )method of the File class,instantiate an object of the File class and send as an argument a filename.

Question 7

In C#,when data is written to a file,it is stored in sorted order by a unique key.

Question 8

Streams are also used in C# to read and write data to binary files.

Question 9

A structure is a special form of value type that supplies alternate names for the values of an underlying primitive type.

Question 10

The StreamReader's Peek( )method returns the next available character but does not consume it.

Question 11

With Visual Studio when you create a file (or attempt to access one),if a path is not
specified with the filename,the Apps\Debug subdirectory of the current project is used.

Question 12

The Execution version of an application contains no debugging information and is considered an optimized solution.

Question 13

The constructor for the StreamWriter class is overloaded to include a Boolean variable indicating whether this is the first time the file was accessed.

Question 14

TextReader is an abstract class used to write primary data types as binary values.

Question 15

A data stream is the flow of data from a source to a receiver.

Question 16

File and Directory classes add functionality to their method members beyond that of FileInfo and DirectoryInfo classes.

Question 17

FileInfo and DirectoryInfo classes expose only static data members.

Question 18

To avoid fully qualifying references to objects of the StreamReader class,include a using statement with the System.StreamReader namespace.

Question 19

To programmatically avoid having a FileNotFoundException or DirectoryNotFoundException exceptions thrown in an application,you should send the filename as an argument to Exists( )before attempting to construct an object.

Question 20

All attempts to access text files should be enclosed inside if...else blocks to check for
exceptions.

Question 21

Instead of hard coding the actual filename and file path,you could prompt the user for the name of the file using subclasses of the FileDialog class.

Question 22

The File,FileInfo,Directory,and DirectoryInfo classes are considered utility classes.They normally work with stream objects,allowing you to manipulate files and directory structures.

Question 23

The ____ class has implementations for Write( )and WriteLine( )methods similar to the Console class methods.

A) StreamWriter
B) Writer
C) TextWriter
D) FileWriter

Question 24

StreamWriter outputFile = new StreamWriter("someOutputFileName");
StreamReader inputFile = new StreamReader("someInputFileName");
The identifier that can be referenced in a WriteLine( )method with the declaration above is ____.

A) someOutputFileName
B) someInputFileName
C) outputFile
D) inputFile

Question 25

StreamWriter outputFile = new StreamWriter("someOutputFileName");
StreamReader inputFile = new StreamReader("someInputFileName");
If an invalid path is included with the constructor for a StreamWriter object,____.

A) an InValidPathException is thrown
B) a System exception occurs
C) an IOException exception is thrown
D) the program terminates

Question 26

StreamReader inFile = new StreamReader("name.txt");
while ((inValue = inFile.ReadLine()) != null)
What does the above statement do?

A) Retrieves one line of text from an input file.
B) Retrieves a single character from an input file.
C) Checks to see if the file is null.
D) Reads every line from an input file.

Question 27

No exception is thrown if you attempt to close or open a file that does not exist.

Question 28

The abstract classes of Stream,TextWriter,and TextReader are defined for dealing with files in the ____ namespace.

A) System.IO
B) System.Files
C) System
D) System.Stream

Question 29

StreamReader inFile = new StreamReader("name.txt");
while ((inValue = inFile.ReadLine()) != null)
Using the above segment of code,inValue would be defined as what type of data?

A) StreamReader
B) int
C) text
D) string

Question 30

None of the of the method named in the File and Directory classes are available as instance methods (with the same name)in the FileInfo and DirectoryInfo classes since they are available in File and Directory.

Question 31

StreamWriter outputFile = new StreamWriter("someOutputFileName");
StreamReader inputFile = new StreamReader("someInputFileName");
If you browse using Windows Explorer or Computer,the physical file that already exists before the two statements from above are executed is ____.

A) outputFile
B) inputFile
C) someOutputFile
D) someInputFile

Question 32

StreamWriter outputFile = new StreamWriter("someOutputFileName");
StreamReader inputFile = new StreamReader("someInputFileName");
Every member of the File class is static-meaning methods are called ____.

A) using the static keyword
B) with the file name
C) with an object name
D) with the class name

Question 33

To invoke File's Copy( )method to make a copy of "source.txt",naming the new file "target.txt",you would write: File.Copy("source.txt","target.txt");because Copy is a static member of the File class.

Question 34

Binary files can not be read using notepad.

Question 35

When you place an @ in front of a string,the string becomes a(n)____.

A) comment
B) verbatim string
C) numeric value
D) argument

Question 36

When you close a file,no arguments are sent to the method;however,the Close( )method must be called with a file object such as fileObjectInFile.Close( ).

Question 37

The StreamReader class is used to create text files.

Question 38

Which of the following class belongs to the System.IO namespace?

A) FileNotFoundException
B) DirectoryException
C) EndOfStreamException
D) System.InvalidException

Question 39

After an application is debugged and you are ready to deploy or distribute it,you can build the most optimized solution,a Release version.To switch to the Release version,select Release from the Solution Configurations list box on the Standard Visual Studio toolbar.

Question 40

The StreamReader class is most often used to retrieve single characters,one character at a time,from a file.

Question 41

StreamReader inFile = new StreamReader("name.txt");
while ((inValue = inFile.ReadLine()) != null)
Which of the following is an abstract class that cannot be instantiated?

A) FileDialog
B) ShowDialog
C) OpenFileDialog
D) Dialog

Question 42

Which exception is thrown when an attempt is made to access a file that does not exist?

A) FileLoadException
B) FileNotFoundException
C) FileNotAvailableException
D) FileException

Question 43

When writing text files,if you add true to the constructor for the Append argument,____.

A) lines are added onto the end of the file
B) a backup is made of the old file
C) "file already exists" message is displayed if a file by the same name exists
D) new data is added onto the end of each line in the file

Question 44

Which of the following class has public constructors?

A) Stream
B) TextReader
C) File
D) StreamReader

Question 45

The StreamReader class extends the ____ class.

A) File
B) FileInfo
C) TextReader
D) IO

Question 46

In order to remove a StreamWriter object named writer,which is associated with a file in the project directory called "test.dta",you would write ____.

A) File.Delete("test.dta")
B) File.Delete(writer)
C) writer.Delete("test.dta")
D) writer.Delete( )

Question 47

The FileDialog class has a property called ____,which is used by both the OpenFileDialog and SaveFileDialog classes to set or get the name of the file using a dialog box.

A) Text
B) Name
C) FileName
D) ID

Question 48

Which of the following is a static member of the Directory class?

A) Encrypted
B) AppendText( )
C) Exists( )
D) DirectoryPath( )

Question 49

Which method is used to cause the dialog boxes to open?

A) OpenDialog( )
B) RevealDialog( )
C) DisplayDialog( )
D) ShowDialog( )

Question 50

The StreamWriter method(s)that clears all buffers for the current writer and causes any buffered data to be written to the underlying stream is ____.

A) Write( ) or WriteLine( )
B) Close( )
C) Flush( )
D) Dispose( )

Question 51

The keyword ____ can be used to define a scope for an object such that the CLR automatically disposes of,or releases,the resource when the object goes out of scope.

A) scope
B) area
C) block
D) using

Question 52

Parent and Root are two key properties of which class?

A) FileInfo
B) StreamReader
C) DirectoryInfo
D) TextReader

Question 53

The most appropriate programmer-defined enumeration identifier for a card's color that has field values of Red,Blue,Yellow,Black,and Green would be ____.

A) card
B) CardColor
C) RedBlueYellowBlackGreen
D) 5Colors

Question 54

Which method,used with the StreamWriter class,can be invoked to write characters to the stream,followed by a line terminator?

A) StreamWrite( )
B) EndOfLine( )
C) Write( )
D) WriteLine( )

Question 55

BinaryReader and BinaryWriter classes ____.

A) expose only static members
B) are used to read and write character strings to files
C) offer streaming functionality oriented toward binary data types
D) are abstract classes

Question 56

If a StreamReader object named reader is instantiated and associated with a file stored in the project directory named "test.dta",which of the following statements would check to see if the "test.dta" exists?

A) if (File.Exists("test.dta"))
B) if (File.Exists(reader))
C) if (reader.Exists("test.dta"))
D) if (reader.Exists( ))

Question 57

Assume that an object of the DirectoryInfo is instantiated using the identifier dirListing.How could you retrieve the names of all files stored in dirListing that have a file extension of .cs?

A) foreach(FileInfo fil in dirListing.GetFiles("*.cs"))
B) foreach(FileInfo fil in dirListing.GetFiles("cs"))
C) foreach(DirectoryInfo dirListing in File.GetFiles("*.cs"))
D) foreach(DirectoryInfo dirListing in File.GetFiles("cs"))

Question 58

Objects of streams can be wrapped with _________ objects to improve the speed and performance of file-handling operations.

A) NetworkStream
B) FileStream
C) MemoryStream
D) BufferedStream

Question 59

StreamReader inFile = new StreamReader("name.txt");
while ((inValue = inFile.ReadLine()) != null)
With the above code segment,how could you programmatically avoid having a FileNotFoundException or DirectoryNotFoundException exception thrown?

A) invoke File.Exists( ) before the while loop
B) invoke File.Exists( ) inside the while loop
C) include a try...catch block
D) test for File.Exists( ) instead of null

Question 60

The gray section below the Form object where dialog objects are placed in Visual Studio is called the ____.

A) dialog area
B) work tray
C) toolbox
D) component tray

Question 61

A(n)____________ is considered a named collection of bytes having persistent or lasting storage.

Question 62

The ____________ class makes it easy to write data to a file because it has implementations for the Write( )and WriteLine( )methods.

Question 63

A(n)____________ is a special form of value type that supplies names for the values.

Question 64

NET Framework includes the ____________ namespace,which provides basic file and directory support classes.It also contains types that enable you to read and write files and data streams.

Question 65

The files created using the ____________ class are readable by the computer but,unlike the files created by the StreamWriter class,you cannot simply open and read the contents of the file using Notepad.A program is needed to interpret the file contents.

Question 66

Archive is a(n)____________ value for the Attributes property of the File class.

Question 67

PadRight( )and PadLeft( )methods of the ____________ class can be use to right or left align values.

Question 68

Values can be processed in any order.The fifth data record can be retrieved and processed before the first record is processed when ____________ access is used.

Question 69

When a method uses a(n)____________ modifier,the method belongs to the class itself,not to a specific object of the class and is thus called using the class name.

Question 70

The ____________ class provides static methods that aid in creating and moving through folders and subdirectories.

Question 71

If you attempt to access a file and have an invalid path listed in the constructor,a(n)____________ exception is thrown.

Question 72

To ensure that the data is usable for the next application the ____________ method should be invoked before you exit the application.

Question 73

If you do not specify the full path for the filename,Visual Studio uses the ____________ subdirectory of the current project.

Question 74

One of the static methods of the File class is ____________.Prior to writing program statements that access data in a file,you should always check to make sure the file is available by invoking this method.

Question 75

The ____________ method of the StreamReader class enables you to retrieve one line of text from the file.