SOExample4, C# - rextester

Language: Layout:

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Derived A - Constructor (name, val) test:");
            var tmp = new DerivedA("test", 1);
            Console.WriteLine();
            
            Console.WriteLine("Derived A - Constructor (parameterless test):");
            var tmp2 = new DerivedA();
            Console.WriteLine();
            
            Console.WriteLine("Derived B - Constructor (parameterless test):");
            var tmp3 = new DerivedB();
            Console.WriteLine();
            
            Console.WriteLine("Derived B - Constructor (parameterless test):");
            var tmp4 = new DerivedB();
            Console.WriteLine();
        }
    }
    
    public class Base
	{		
		public Base(int a)
		{
            // this method body is executed first
            Console.WriteLine("Base constructor");
		}
	}
	
	public class DerivedA : Base
	{
		public DerivedA(string name, int val) : base(val)
		{
            Console.WriteLine("DerivedA: Derived constructor (name, val)");
            // this method body is executed second (last if you used this constructor, e.g. new DerivedA("hello", 1) )
		}
		
		public DerivedA() : this("test", 5) // this will call the constructor above, which will first call base. So the final chain is: base, constructor above, this constructor
		{
            Console.WriteLine("DerivedA: Parameterless derived constructor");
		    // this method body is executed third (last if you used this constructor, e.g. new DerivedA() )
		}
	}
	
	public class DerivedB : Base
	{
		public DerivedB(string name, int val) : base(val)
		{
            Console.WriteLine("DerivedB: Derived constructor (name, val)");
		}
		
		public DerivedB() : base(5) // this will call the base constructor, and then this constructor. The constructor above will not be used.
		{
            Console.WriteLine("DerivedB: Parameterless derived constructor");
		}
	}
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,13 sec, cpu time: 0,11 sec, average memory usage: 15 Mb, average nr of threads: 3, absolute service time: 0,29 sec