How to create const string from string variable

Question

I want to create const string from another string variable. For example the next two code snippets can't compile

1)

string str = "111";
const string str2 = str;

2)

string str = "111";
const string str2 = new string(str.ToCharArray());

Which results in

Error: The expression being assigned to 'str2' must be constant 

Is there any way to create a const string from string variable ?

Answer 1

In short - no.

The value assigned to a const must be a compile time constant.

You can use readonly instead of const, which will let you change the value of the variable - you will only be able to change the reference in the constructor.

Answer 2

Nope. Because const variables are works on compile time.

Everybody agree on using readonly;

readonly string t = s + " World";