Why is new String(“Hello”) invalid in C#?

Question

What is the logic/reason behind making

String s= new String(\"Hello World\");

Illegal in C#? The error is

The best over

Answer 1

In my opinion, The basic difference is the 'Pass by Reference' and 'Pass by Value' in .NET and JAVA.

Leading to a design pattern in Java, for a reason which may be

A constructor for copying an object of the same class.

In .NET you don't require such constructor to copy/clone the string because it can do it in following way (directly),

'String test = txtName.Text;'

This is my understanding of .net and java.

I hope I was able to give proper reasoning.

Thanks and Regards

Harsh Baid

Answer 2

It's .NET, not C#. Look at the constructors for System.String - none accept a System.String

So it's "illegal" for the same reason you can't construct a string with an int.

string x = new String(1);

---

Raymond Chen

The answer to "Why doesn't this feature exist?" is usually "By default features don't exist. Somebody has to implement them."

---

My guess is that every time someone sat down to implement this constructor. They thought about String.ToString's implementation and determined the constructor would logically undermine that method.

Answer 3

It would be rather pointless to use the constructor to create a new string based on another existing string - that's why there is no constructor overload that allows this. Just do

string s = "Hello World";