Properties::Advance : C# programming for c++ programmers

Properties:

Usually inside a class we provide function GET and SET, similarly C# provides a built in mechanism called properties.

Example: 

class MyClass
{
      private int x;
      public int X
      {
get
{
   return x;
}

set
{
   x = value;
}
}
}

After .net 3.0

class MyClass
{
     
      public int X{get;set;}  // Auto generates private feild with the name of property.
}


Note:

Static Properties:
C# also supports static properties.set/get accessor of static property can access only other static members of the class. Also static properties are invoking by using the class name.


Properties & Inheritance:

The properties of a Base class can be inherited to a Derived class.

Properties & Polymorphism:

A Base class property can be polymorphicaly overridden in a Derived class. But remember that the modifiers like virtual, override etc are using at property level, not at accessor level.

Example:

using System;
class Base
{
    public virtual int X
    {
       get
       {
          Console.Write("Base GET");
          return 10;
       }
       set
       {
          Console.Write("Base SET");
       }
    }
}


class Derived : Base
{
    public override int X
    {
        get
        {
          Console.Write("Derived GET");
          return 10;
        }
        set
        {
          Console.Write("Derived SET");
        }
    }
}


Abstract Properties: 

A property inside a class can be declared as abstract by using the keyword abstract. Remember that an abstract property in a class carries no code at all. The get/set accessors are simply represented with a semicolon. In the derived class we must implement both set and get assessors.

If the abstract class contains only set accessor, we can implement only set in the derived class.

Example:

class MyClient
{
    public static void Main()
    {
         Base b1 = new Derived();
         b1.X = 10;
 Console.WriteLine(b1.X);//Displays 'Derived SET Derived GET 10'
    }
}