Virtual Members - CSharp Custom Type

CSharp examples for Custom Type:virtual

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Introduction

A function marked as virtual can be overridden by subclasses to provide a specialized implementation.

Methods, properties, indexers, and events can all be declared virtual.

The signatures, return types, and accessibility of the virtual and overridden methods must be identical. 

public class Item
{
   public string Name;
   public virtual decimal Liability => 0;   // Expression-bodied property
}

A subclass overrides a virtual method by applying the override modifier: 

using System;
      public class Item
      {
         public string Name;
         public virtual decimal Liability => 0;   // Expression-bodied property
      }


     public class Stock : Item
     {
       public long SharesOwned;
     }

     public class Company : Item
     {
       public decimal Mortgage;
       public override decimal Liability => Mortgage;
     }

class Test
{
static void Main(){

     Company mansion = new Company { Name="McMansion", Mortgage=250000 };
     Item a = mansion;
     Console.WriteLine (mansion.Liability);  // 250000
     Console.WriteLine (a.Liability);        // 250000
}
}

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