The As Operator for custom class type : As : Operator C# Examples

    
using  System;

interface  Printable
{
        void  MarginX(float  factor);
        void  MarginY(float  factor);
}
public  class  Component
{
        public  Component()  {}
}
public  class  TextField:  Component,  Printable
{
        public  TextField(string  text)
        {
                this.text  =  text;
        }
        //  implementing  Printable.MarginX()
        public  void  MarginX(float  factor)
        {
                Console.WriteLine("MarginX:  {0}  {1}",  text,  factor);
        }
        
        //  implementing  Printable.MarginY()
        public  void  MarginY(float  factor)
        {
                Console.WriteLine("MarginY:  {0}  {1}",  text,  factor);
        }
        
        private  string  text;
}

class  MainClass
{
        public  static  void  Main()
        {
                Component[]  dArray  =  new  Component[100];
                
                dArray[0]  =  new  Component();
                dArray[1]  =  new  TextField("A");
                dArray[2]  =  new  TextField("B");
                
                foreach  (Component  d  in  dArray)
                {
                        Printable  scalable  =  d  as  Printable;
                        if  (scalable  !=  null)
                        {
                                scalable.MarginX(0.1F);
                                scalable.MarginY(10.0F);
                        }
                }
        }
}