Question

I want to, for example, add a method to integer (i.e., Int32), which will make me able to do the following:

int myInt = 32;
myInt.HelloWorld();

One can say, instead of insisting doing the above, you can write a method which takes an integer, HelloWorld(integer), like the following, more easily:

int myInt = 32;
HelloWorld(myInt);

However, I’m just curious whether it’s possible or not. If true, is that a good programming practice to add some other functionality to well known classes?

PS: I tried to make another class which inherits from Int32, but cannot derive from sealed type ‘int’.

Answer 1

You can add an extension method for int32.

   public static class Int32Extensions
   {
       public static void HelloWorld(this int value) 
       {
         // do something
       }
   }

Just remember to using the namespace the class is in.