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Questions and Answers
What is the purpose of the CanSeek attribute in a stream?
What is the purpose of the CanSeek attribute in a stream?
- It indicates the stream's ability to perform seek operations. (correct)
- It checks if the stream can be closed.
- It determines if the stream can be written to.
- It verifies if the stream is currently opened.
Which code correctly initializes a new instance of the StreamReader class for a specified file name?
Which code correctly initializes a new instance of the StreamReader class for a specified file name?
- StreamReader stream = new StreamReader(string filename);
- public StreamReader stream = new StreamReader(filename);
- StreamReader stream = new StreamReader(string filepath);
- StreamReader stream = new StreamReader(fileName); (correct)
What is the effect of the Flush() method in stream handling?
What is the effect of the Flush() method in stream handling?
- It prevents any further writing to the stream.
- It writes all data from the buffer to the file and releases file handle.
- It clears the stream and releases all resources.
- It pushes any buffered data to the stream and clears all buffers. (correct)
Which FileMode option is used to open an existing file and create a new one if it doesn’t exist?
Which FileMode option is used to open an existing file and create a new one if it doesn’t exist?
In the context of streams, what is the result of reading from an input stream with the following syntax: int val = streamReader.Read(); Console.WriteLine(val);?
In the context of streams, what is the result of reading from an input stream with the following syntax: int val = streamReader.Read(); Console.WriteLine(val);?
Which of the following accurately describes the Global Assembly Cache (GAC)?
Which of the following accurately describes the Global Assembly Cache (GAC)?
What method is used to read a block of bytes from a stream?
What method is used to read a block of bytes from a stream?
Which code snippet correctly creates a FileStream object?
Which code snippet correctly creates a FileStream object?
Flashcards
FileStream
FileStream
A .NET class used to create a byte-oriented stream linked to a file.
CanSeek
CanSeek
Attribute that determines if a stream responds to position requests.
OpenCreate
OpenCreate
FileMode that will create a new file if one doesn't exist.
StreamReader
StreamReader
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Peek()
Peek()
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Streams
Streams
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CanRead
CanRead
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Global Assembly Cache (GAC)
Global Assembly Cache (GAC)
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Study Notes
Event-Driven Programming
- Question 1:
Peek()retrieves a value from a stream without changing the file pointer. - Question 2: Streams are sources like I/O devices that transmit byte sequences.
- Question 3: The
CanSeekattribute determines if a stream supports position requests. - Question 4:
.dllfiles are reusable components. - Question 5:
CanReadreturnstrueif a stream can be read. - Question 6: To create a byte-oriented stream associated with a file, use the
FileStreamclass. - Question 7: An assembly's
Manifestincludes name, version, and mapping information. - Question 8:
OpenCreateopens a file, creating it if it doesn't exist. - Question 9:
public StreamReader(string filename)initializes aStreamReaderfor a specified file.
FileStream and StreamWriter
- Question 10:
FileStream(string fileName, FileMode fileMode)creates aFileStreamobject. - Question 11:
StreamReader(string fileName)sets the file name. - Question 12:
Flush()empties the current stream's buffer contents. - Question 13:
int val = streamReader.Read(); Console.WriteLine(val)reads and displays stream content.
Global Assembly Cache (GAC)
- Question 14: The GAC lets multiple apps share assemblies.
Stream Operations
- Question 15:
public override int Read(byte[] arr, int offset, int count)reads bytes from a stream. - Question 16:
long Seek(long varNum, SeekOrigin position)adjusts the file pointer's position.
Private vs. Shared Assemblies
- Private assemblies are used by a single application, offering isolation and easy deployment.
- Shared assemblies are stored in the Global Assembly Cache (GAC) and allow multiple applications to reuse the same code, promoting consistency and centralized management.
- The choice depends on prioritizing code reuse against isolation within a project.
StreamWriter Creation and Check
- New StreamWriter: use
FileStreamas a parameter to createStreamWriter. ThenFlush()theStreamWriter. - File Writability: Use
myStream.CanWriteto check if a FileStream is writable, displaying appropriate messages based on the result.
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