Event Driven Programming - Prefinals
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Questions and Answers

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?

  • 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?

  • 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?

    <p>OpenOrCreate</p> Signup and view all the answers

    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);?

    <p>It returns the next character or -1 if no more characters are available.</p> Signup and view all the answers

    Which of the following accurately describes the Global Assembly Cache (GAC)?

    <p>It allows multiple applications to share assemblies.</p> Signup and view all the answers

    What method is used to read a block of bytes from a stream?

    <p>public override int Read(byte[] arr, int offset, int count);</p> Signup and view all the answers

    Which code snippet correctly creates a FileStream object?

    <p>FileStream stream = new FileStream(string fileName, FileMode fileMode);</p> Signup and view all the answers

    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 CanSeek attribute determines if a stream supports position requests.
    • Question 4: .dll files are reusable components.
    • Question 5: CanRead returns true if a stream can be read.
    • Question 6: To create a byte-oriented stream associated with a file, use the FileStream class.
    • Question 7: An assembly's Manifest includes name, version, and mapping information.
    • Question 8: OpenCreate opens a file, creating it if it doesn't exist.
    • Question 9: public StreamReader(string filename) initializes a StreamReader for a specified file.

    FileStream and StreamWriter

    • Question 10: FileStream(string fileName, FileMode fileMode) creates a FileStream object.
    • 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 FileStream as a parameter to create StreamWriter. Then Flush() the StreamWriter.
    • File Writability: Use myStream.CanWrite to check if a FileStream is writable, displaying appropriate messages based on the result.

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