Classes, C# - rextester

Classes

//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

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

namespace Rextester    
{
    interface IGreet
    {
        string Greet();   
    }
    
    public partial class Person : IGreet
    {
        public string FirstName { get; internal set; }
        public string LastName { get; internal set; }
        // Where is Greet?
        // public string FirstName { get; private set; } // ?
    }
    
    // This can be in a different file!
    public partial class Person : IGreet 
    {
        public string Greet() 
        {
            return "Hello from " + FullName;
        }
        
        public virtual string FullName {
            get 
            {
                return FirstName + " " + LastName;
            }
        }    
    }
    
    public class NicePerson : Person
    {
        public override string FullName 
        {
            get 
            {
                return "Nice " + base.FullName;
            }
        }
        
        // Not possible! Function not marked virtual.
        // public override string Greet() {
        //     return "Nice hello from " + FullName;   
        // }
    }
    
    public class Program
    {
        public static void Main(string[] args)
        {
            Person p = new Person();
            p.FirstName = "Peter";
            p.LastName = "P";
            Console.WriteLine("Hello " + p.FirstName);
            Console.WriteLine(p.Greet());
            
            //NicePerson nicep = new NicePerson() { FirstName = "Joe", LastName = "J" };
            //Console.WriteLine(nicep.Greet());
        }
    }

}


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