Question

I want to inherit to extend the C# string class to add methods like WordCount() and several many others but I keep getting this error:

Error 1 ‘WindowsFormsApplication2.myString’: cannot derive from sealed
type ‘string’

Is there any other way I can get past this ? I tried with string and String but it didn’t work.

Answer 1

System.String is sealed, so, no, you can’t do that.

You can create extension methods. For instance,

public static class MyStringExtensions
{
    public static int WordCount(this string inputString) { ... }
}

use:

string someString = "Two Words";
int numberOfWords = someString.WordCount();