Difference between Virtual Override New Keywords with Example c#

Difference between Virtual Override New Keywords with Example c#

Generally virtual and override keywords will occur in overriding method of polymorphism concept and new keyword will be used to hide the method. Here I will explain these keywords with example for that check below code. I have one method Show() which exists in two classes SampleA and SampleB as shown below

using System; namespace ConsoleApplication3 { class SampleA { public void Show() { Console.WriteLine("Sample A Test Method"); } } class SampleB:SampleA { public void Show() { Console.WriteLine("Sample B Test Method"); } } class Program { static void Main(string[] args) { SampleA a=new SampleA(); SampleB b=new SampleB(); a.Show(); b.Show(); a = new SampleB(); a.Show(); Console.ReadLine(); } } }

Output:

Sample A Test Method Sample B Test Method Sample A Test Method

New Keyword Example or Method Hiding

using System; namespace ConsoleApplication3 { class SampleA { public void Show() { Console.WriteLine("Sample A Test Method"); } } class SampleB:SampleA { public new void Show() { Console.WriteLine("Sample B Test Method"); } } class Program { static void Main(string[] args) { SampleA a=new SampleA(); SampleB b=new SampleB(); a.Show(); b.Show(); a = new SampleB(); a.Show(); Console.ReadLine(); } } }

Virtual and Override Keywords Example or Method Overriding:

using System; namespace ConsoleApplication3 { class SampleA { public virtual void Show() { Console.WriteLine("Sample A Test Method"); } } class SampleB:SampleA { public override void Show() { Console.WriteLine("Sample B Test Method"); } } class Program { static void Main(string[] args) { SampleA a=new SampleA(); SampleB b=new SampleB(); a.Show(); b.Show(); a = new SampleB(); a.Show(); Console.ReadLine(); } } }

Output:

Sample A Test Method Sample B Test Method Sample B Test Method

Use Both Method Overriding & Method Hiding:

using System; namespace ConsoleApplication3 { class SampleA { public void Show() { Console.WriteLine("Sample A Test Method"); } } class SampleB:SampleA { public new virtual void Show() { Console.WriteLine("Sample B Test Method"); } } class SampleC : SampleB { public override void Show() { Console.WriteLine("Sample C Test Method"); } } class Program { static void Main(string[] args) { SampleA a=new SampleA(); SampleB b=new SampleB(); SampleB c = new SampleC(); a.Show(); b.Show(); c.Show(); a = new SampleB(); a.Show(); b = new SampleC(); b.Show(); Console.ReadLine(); } } }

Output:

Sample A Test Method Sample B Test Method Sample C Test Method Sample A Test Method Sample C Test Method