C# Structures

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Questions and Answers

What is the main difference between a structure and a class in C#?

A structure cannot inherit from another structure, but a class can.

A structure can have only value type members, but a class can have both value and reference type members.

A structure is a value type and a class is a reference type. (correct)

A structure is a reference type and a class is a value type.

What is the primary use of structures in C#?

To define a new pre-defined data type.

To define a class with a single variable.

To define a collection of variables of the same data type.

To define a collection of variables of different data types under a single unit. (correct)

What is a common term used to describe a structure in C#?

Pre-Defined Data Type

User-Defined Data Type (correct)

User-Defined Function

Pre-Defined Function

Why are structures useful in C#?

Because they can be modified according to requirements. Signup and view all the answers

What type of data type is a structure in C#?

Value type Signup and view all the answers

What is the primary purpose of the StreamReader class?

To read characters from a Stream by converting bytes into characters Signup and view all the answers

What is the main function of the System.IO namespace?

To enable reading and writing to files and data streams Signup and view all the answers

What is the primary purpose of file handling in C#?

To store and retrieve data from a file Signup and view all the answers

What is a stream in the context of file handling in C#?

A sequence of bytes Signup and view all the answers

What is a directory in the context of a file system?

A special type of file that can be used to store other files and directories Signup and view all the answers

What is the purpose of the System.IO namespace in C#?

To provide classes for input and output streams Signup and view all the answers

What can you use the Directory class for?

To create, copy, move, and delete directories Signup and view all the answers

What is the base class for all streams in C#?

System.IO.Stream Signup and view all the answers

What is the purpose of the StreamWriter class?

To write strings to a Stream by converting characters into bytes Signup and view all the answers

What is the primary purpose of the CryptoStream class?

To link data streams to cryptographic transformations Signup and view all the answers

What is the purpose of the FileStream class in C#?

To read and write bytes to a physical file Signup and view all the answers

What is the purpose of the MemoryStream class in C#?

To read and write bytes to a memory location Signup and view all the answers

What are the two basic operations that are commonly used in file handling?

Reading and writing Signup and view all the answers

What is the purpose of the BufferedStream class in C#?

To improve the performance of certain I/O operations Signup and view all the answers

Study Notes

Structure in C#

A value type that stores a collection of variables of different data types under a single unit
Similar to a class, being a user-defined data type that holds multiple data types
Allows users to define their own data types, also known as User-Defined Data Types
Although a value type, structures can be modified according to requirements

File Handling in C#

File handling refers to the process of storing and retrieving data from files using a program.
In C#, file handling allows storing data in a file and fetching/extracting it to work again in any program.

File Operations

File handling involves various operations like creating, reading, writing, and appending files.
Reading and writing are the two basic operations used in file handling.
A file becomes a stream when opened for writing and reading.

Streams

A stream is a sequence of bytes used for communication.
Two streams can be formed from a file: input stream for reading and output stream for writing.
The System.IO namespace in C# contains classes that handle input and output streams and provide information about file and directory structures.

C# Stream Classes

System.IO.Stream is an abstract class that provides standard methods to transfer bytes to a source.
FileStream reads or writes bytes from/to a physical file.
MemoryStream reads or writes bytes stored in memory.
BufferedStream improves I/O operations' performance.
NetworkStream reads or writes bytes from a network socket.
PipeStream reads or writes bytes from different processes.
CryptoStream links data streams to cryptographic transformations.

StreamReader and StreamWriter

StreamReader is a helper class that reads characters from a Stream by converting bytes into characters.
StreamWriter is a helper class that writes a string to a Stream by converting characters into bytes.

File System

A file system refers to the structure, rules, and regulations defined by the host Operating System.
A directory is a special type of file that can store other files and directories.
The System.IO namespace contains types that enable reading and writing to files and data streams, as well as support for basic file and directory operations.

Directory Class

The Directory class contains static methods for creating, copying, moving, and deleting directories.

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Description

Learn about structures in C# programming, a user-defined data type that holds multiple variables of different data types. Understand the concept of value types and how to define custom data types in C#.