Question

How to use virtual, override and new to create versioning in C#

Answer 1

using System;   
using System.IO;

namespace ConsoleApplication_C_Sharp
{
    public class BaseClass
    {
        public virtual string GetString1()
        {
            return "BaseClass: public virtual string GetString1()";
        }
        public virtual string GetString2()
        {
            return "BaseClass: public virtual string GetString2()";
        }
        public virtual string GetString3()
        {
            return "BaseClass: public virtual string GetString3()";
        }
    }

    class DerivedClass : BaseClass
    {
        public override string GetString1()
        {
            return "DerivedClass: public override string GetString1()";
        }
        public new string GetString2()
        {
            return "DerivedClass: public new string GetString2()";
        }
        public override string GetString3() 
        {
            return "DerivedClass: public string GetString3()";
        }

        static void Main(string[] args)
        {
            DerivedClass derivedclass = new DerivedClass();
            BaseClass baseclass = (BaseClass)derivedclass;

            Console.WriteLine(baseclass.GetString1());
            Console.WriteLine(baseclass.GetString2());
            Console.WriteLine(baseclass.GetString3());
        }
    }
}


/*
run:
    
DerivedClass: public override string GetString1()
BaseClass: public virtual string GetString2()
DerivedClass: public string GetString3()

*/

 

70+ SQL courses for beginners and professionals