inheritance in csharp

Question

how to access child class member from parents class instance

James Axsom · Answer

Hi Dnyaneshwar. This is how you do it via abstract classes and methods I have a parent class: Animal I have two child classes: Dog and Cat Each of the two option buttons dicates which child class will be used. However I will be using the parent object varaible to call that child's code implementation Choosing Child Class: Dog Choosing Child Class: Cat Code: using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Data.SqlClient; using System.Drawing; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace Sandbox2 { public partial class MyMainForm : Form { public MyMainForm() { InitializeComponent(); } private void MyMainForm_Load( object sender, EventArgs e) { } private void simpleButton1_Click( object sender, EventArgs e) { // Parent class Animal a = null ; if (optDog.Checked== true ) { // Parent class will implement Dog class stuff a = new Dog( "Canine" , "Whippet" ); } if (optCat.Checked == true ) { // Parent class will implement Cat class sutff a = new Cat( "Feline" , "Tabi" ); } // using a parent class to execute child class implementation txtAction.Text = a.DoAnAnimalActions(); } } public abstract class Animal { private string m_animalKind = string .Empty; private string m_breed = string .Empty; protected StringBuilder sb = null ; public Animal( string animalKind, string breed) { m_animalKind = animalKind; m_breed = breed; } public string AnimalKind { get { return m_animalKind; } } public string Breed { get { return m_breed; } } // defines a template for implementation in child class public abstract string DoAnAnimalActions(); } public class Dog : Animal { public Dog( string animalKinda, string breed) : base (animalKinda, breed) { sb = new StringBuilder(); } // child class implementation public override string DoAnAnimalActions() { Bark(); Chase(); LookDumb(); return sb.ToString(); } // Things Dogs Do private void Bark() { sb.Append( "Bark " ); } private void Chase() { sb.Append( "Chase " ); } private void LookDumb() { sb.Append( "Look Dumb" ); } } public class Cat : Animal { public Cat( string animalKinda, string breed) : base (animalKinda, breed) { sb = new StringBuilder(); } // child class implementation public override string DoAnAnimalActions() { Meow(); Hide(); Stalk(); return sb.ToString(); } // Things Cats Do private void Meow() { sb.Append( "Meow " ); } private void Hide() { sb.Append( "Hide " ); } private void Stalk() { sb.Append( "Stalk" ); } } }

Hemalatha Sunnapu · Answer

HI Dnyaneshwar , Did you get the answer ?

Vova Kms · Answer

Project WinForms or WPF ?