c# inheritance programs code example

Example 1: inheritance in c#

// Parent Class
public class A
{
    public void Method1()
    {
        // Method implementation.
    }
}
// inherit class A in class B , which makes B the child class of A
public class B : A
{ }

public class Example
{
    public static void Main()
    {
        B b = new B();
        // It will call the parent class method 
        b.Method1();
    }
}

Example 2: c# inheritance

// ----------------- INHERITANCE and POLYMORPHISM ------------------ //


// ----- TOP CLASS ----- //
class Parent
{
  protected int ID;   // This will be inherited by the child class
  
  public Parent()   // This constructor will automatically be called when we create a child object 
  {
    ID = 0;
  }
  
  public Parent(int Id)   // This constructor will automatically be called when we create a child object 
  {
    ID = Id;
  }
  
  
  public virtual void Method1 (string someInput)   // The "virtual" keyword allows you to override this method
  {
    Console.WriteLine("Hi there, this method will be inherited");
    Console.WriteLine(someInput);
  }
  
  protected void Method2 ()
  {
    Console.WriteLine("Hi there, this method will also be inherited");
  }
  
    protected void Method3 ()
  {
    Console.WriteLine("Hi there, this method will also be inherited");
  }
  
}


// ----- LOWER CLASS ----- //
class Child : Parent
{
	pritave int count;    // This class has both the "count" and "ID" properties, since the "ID" was inherited
    
    
	public Parent()   // Both the parent and child base constructors are called  
    {
      count = 0;
    }
    
    
    public Parent(int Id) : base (Id)  // Both the parent and child second constructors are called  
    {
      count = 0;
    }
    
    
    public override void Method1 (string someInput)  // This will override the original Method1 funtion
    {	
    	base.Method1 (someInput);  // This will call the original method from the parent that now, also belongs to the child 
        // ... some code ...
    }
    
        
    protected new void Method2 ()   // This will not override but will instead make it a priority over the other Method2() 
    {                               // This is only used if you create an object like: Parent obj = new Child() and not if you create: Child obj = new Child()  
      Console.WriteLine("Make it do something different");
    }
    
    
    public sealed override void Method3 ()   // This "sealed" keyword will stop other subclasses that derive from the child, from overriding this method again 
    {                              
      Console.WriteLine("Make it do something different");
    }
    
    
	public void Method4 (string someInput, int count)
    {	
    	base.Method1 (someInput);  //Or just: Method1 (someInput) since, in this case, the methods are different
        this.count = count;
    }

}