C# Concepts: Abstract Class, Interface, Static Class & Partial Class
Duration : 00:03:00
Abstract Class:
An abstract class in C# is a class that cannot be instantiated on its own and is typically used as a base class for other classes. It can contain both abstract (unimplemented) and concrete (implemented) methods. Subclasses that derive from an abstract class must provide implementations for all its abstract members.Example:
abstract class Shape
{
public abstract double Area(); // Abstract method
public void Display()
{
Console.WriteLine("This is a shape.");
}
}
class Circle : Shape
{
public double Radius { get; set; }
public Circle(double radius)
{
Radius = radius;
}
public override double Area()
{
return Math.PI * Radius * Radius;
}
}
Interface:
An interface in C# defines a contract of methods and properties that a class must implement. It provides a way to achieve multiple inheritance since a class can implement multiple interfaces.Example:
interface IDrawable
{
void Draw(); // Method declaration without implementation
}
interface IResizable
{
void Resize(int width, int height); // Method declaration without implementation
}
class Rectangle : IDrawable, IResizable
{
public void Draw()
{
Console.WriteLine("Drawing a rectangle.");
}
public void Resize(int width, int height)
{
Console.WriteLine($"Resizing to width: {width}, height: {height}");
}
}
C# static class:
A ‘static class’ cannot be instantiated and is used to provide utility functions.Example:
static class Logger
{
public static void Log(string message)
{
// Log the message
}
}
Logger.Log("An important message");
C# Partial Class:A partial class in C# allows you to split a single class declaration across multiple source files. This is often used to separate auto-generated code from developer-written code or to organize a large class into manageable parts while still treating it as a single class.Example:
// File1.cs
partial class MyPartialClass
{
public void Method1()
{
Console.WriteLine("Method1 from File1");
}
}
// File2.cs
partial class MyPartialClass
{
public void Method2()
{
Console.WriteLine("Method2 from File2");
}
}
// Program.cs
using System;
class Program
{
static void Main()
{
MyPartialClass myObj = new MyPartialClass();
myObj.Method1(); // Output: Method1 from File1
myObj.Method2(); // Output: Method2 from File2
}
}
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