C# Programming: Data Types and File Handling

Questions and Answers

Jakiego namespace'a należy użyć do obsługi plików w C#?

System.IO (correct)

System.Text

System.Data

System.File

Którą klasę należy użyć do czytania z pliku w C#?

FileWriter

TextWriter

FileReader

StreamReader (correct)

Jakiej metody należy użyć, aby odczytać linię z pliku za pomocą `StreamReader`?

ReadText()

ReadLine() (correct)

GetLine()

NextLine()

Którą klasę należy użyć do zapisywania do pliku w C#?

StreamWriter Signup and view all the answers

Jakiej metody należy użyć, aby zapisać dane do pliku za pomocą `StreamWriter`?

WriteLine() Signup and view all the answers

W jaki sposób C# umożliwia zarządzanie różnymi typami danych?

Poprzez różne klasy i metody dostępne w namespace <code>System.IO</code>. Signup and view all the answers

Gdzie są przechowywane wartości typów referencyjnych w C#?

Na stercie Signup and view all the answers

Które z typów danych w C# są zazwyczaj przechowywane na stosie?

Typy wartości Signup and view all the answers

Do czego służą wskaźniki w C#?

Zapewniają bezpośredni dostęp do adresów pamięci Signup and view all the answers

Jakie typy danych są tworzone za pomocą klas w C#?

Typy niestandardowe Signup and view all the answers

Który sposób przechowywania wartości w C# jest bardziej złożony i obejmuje zarówno referencję do obiektu, jak i metadane o obiekcie?

Typy referencyjne Signup and view all the answers

Dlaczego wskaźniki są zazwyczaj unikane w większości aplikacji napisanych w C#?

Z powodu ich skomplikowanej natury i potencjału wprowadzania błędów Signup and view all the answers

Study Notes

C# Programming: An Introduction

Data Types

In C#, there are four main categories of data types: value types, reference types, pointers, and custom data types. Value types store values directly within variables, while reference types create objects. Pointers allow direct manipulation of memory locations, and custom data types can be created using classes.

Value Types

Value types are stored directly in the location where the variable is declared. They include numeric types like int, float, and double as well as boolean and character types. Value types are typically stored on the stack for simplicity and efficiency.

Reference Types

Reference types are stored on the heap, and their values consist of both a reference to the actual object and metadata about the object itself. Examples of reference types include classes, interfaces, and delegates. Reference types are used for creating and managing objects in C#.

Pointers

Pointers in C# provide direct access to memory addresses. They are used for operations that require low-level control over memory, such as memory allocation and deallocation. However, due to their complexity and potential for introducing bugs, pointers are typically avoided in most C# applications.

Custom Data Types

Custom data types in C# are created using classes. Classes define the properties and methods of the data type, allowing for the creation of complex data structures that can be used to model real-world objects and concepts.

File Handling

File handling in C# is typically done using the System.IO namespace, which provides classes and methods for reading from and writing to files.

Reading from a File

To read from a file, you can use the StreamReader class in the System.IO namespace. Here's an example:

using System.IO;

string path = "example.txt";

using (StreamReader reader = new StreamReader(path))
{
    string line = reader.ReadLine();
    Console.WriteLine(line);
}

In this code, a StreamReader object is created with the file path as a parameter. The ReadLine() method is then called to read a line from the file, and the line is printed to the console using Console.WriteLine().

Writing to a File

To write to a file, you can use the StreamWriter class in the System.IO namespace. Here's an example:

using System.IO;

string path = "example.txt";

using (StreamWriter writer = new StreamWriter(path))
{
    writer.WriteLine("Hello, World!");
}

In this code, a StreamWriter object is created with the file path as a parameter. The WriteLine() method is then called to write the string "Hello, World!" to the file.

In conclusion, C# provides a wide range of data types and file handling capabilities, making it a versatile language for developing a variety of applications.

Description

Learn about the main categories of data types in C# such as value types, reference types, pointers, and custom data types. Explore file handling in C# using the System.IO namespace for reading from and writing to files. Enhance your understanding of C# programming principles with this informative quiz.