Question

I want to create a class that can only be inherited, for that i know it should be made abstract. But now the problem is that i want to use functions of that class without making them static. How can i do that.

public abstract Class A
{
 A()
 {}
 public void display()
 {}
}

public Class B:A
{
 base.A() // this is accessible
 this.display() // this is not accessible if i dont make this function static above
}

Answer 1

Your example will not compile, you could consider something like this:

using System;

public abstract class A
{
    protected A()
    {
        Console.WriteLine("Constructor A() called");
    }
    public void Display()
    {
        Console.WriteLine("A.Display() called");
    }
}

public class B:A
{
    public void UseDisplay()
    {
        Display();
    }
}

public class Program
{
    static void Main()
    {
        B b = new B();
        b.UseDisplay();
        Console.ReadLine();
    }
}

Output:

Constructor A() called
A.Display() called

Note: Creating a new B() implicitly calls A(); I had to make the constructor of A protected to prevent this error:
“‘A.A()’ is inaccessible due to its protection level”