Is it possible to derive from System.String?

Question

I am deriving a class from String, but it won't allow me to inherit from that class. What do I need to do if I want to inherit like this?

public class a : string
{ 
  //class definition
}

You can't, `string` is a sealed class. See [here](https://msdn.microsoft.com/en-us/library/system.string(v=vs.110).aspx) — Maarten, Sep 30 '15 at 08:48
The short answer is as Maarten says... the question is must you inherit string? Will a string extension do?... I suspect a string extension method will serve your purpose https://msdn.microsoft.com/en-us/library/bb383977.aspx — Paul Zahra, Sep 30 '15 at 08:49
what is your reasoning for wanting to derive from String? (which is not possible to do anyway as it is a sealed class) — Ahmed ilyas, Sep 30 '15 at 08:49
No particular reason for doing like this. i was just checking — sujith karivelil, Sep 30 '15 at 08:51

score 4 · Accepted Answer · answered Sep 30 '15 at 08:51

4

You cannot inherit from String because it is sealed. If you have to extend the provided functionality, you have two options:

answered Sep 30 '15 at 08:51

germi

score 0 · Answer 2 · answered Sep 30 '15 at 08:52

0

You cannot inherit from string class as it is sealed. For any additional behavior to the string class consider creating extension methods.

answered Sep 30 '15 at 08:52

Yogi

score 0 · Answer 3 · answered Sep 30 '15 at 08:52

Short answer :

You can't derive from basic type.

Long answer :

You can't because the String class is maked as sealed, preventing inheritance.

If you want to add methods to the string object, you can use extention methods (more info here : https://msdn.microsoft.com/en-us/library/bb383977.aspx)

3 Answers3