writing to a strings index

[Steve]

I have this code:
string test = new string(' ', 2);
test[0] = 't';

and I'm getting a compiler error that string.this[int] is read only. Hmmm.
Why? I didn't declare it const or readonly?

 

[Peter Rilling]

Strings are immutable. They cannot be changed.

 

[Marc Gravell]

strings in .Net are immutable - i.e. you cannot change their content once
created; depending on your intended usage, you could use substring /
replace/ regex functions to create a new string based on yours, or you could
call .ToCharArray(), change the array, and then create a new string from the
array (one of the ctors accepts char[]).

Marc

 

[Nicholas Paldino [.NET/C# MVP]]

Steve,

Strings are treated as immutable. Once you create one, you can't change
the contents of it. You can use it as an input to create new strings.

In this case, you would have to create a new string, and concatenate
them together, like so:

test = (new String('t', 1)) + test.Substring(1);

Hope this helps.

 

[Guest]

Try the StringBuilder class

strings in .Net are immutable - i.e. you cannot change their content once
created; depending on your intended usage, you could use substring /
replace/ regex functions to create a new string based on yours, or you could
call .ToCharArray(), change the array, and then create a new string from the
array (one of the ctors accepts char[]).

Marc

I have this code:
string test = new string(' ', 2);
test[0] = 't';

and I'm getting a compiler error that string.this[int] is read only.
Hmmm.
Why? I didn't declare it const or readonly?

 

[Steve]

great, thanks for all the answers everyone! While I don't understant why
they implemented the string class like this, I'm sure there is a logical and
sound explanation. I have since used substring to accomplish what I need.

Thanks again!

 

[Nicholas Paldino [.NET/C# MVP]]

Steve,

Mainly for performance reasons, as well as confusion... It just makes a
good number of things easier knowing it won't change.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

great, thanks for all the answers everyone! While I don't understant why
they implemented the string class like this, I'm sure there is a logical
and
sound explanation. I have since used substring to accomplish what I need.

Thanks again!

I have this code:
string test = new string(' ', 2);
test[0] = 't';

and I'm getting a compiler error that string.this[int] is read only. Hmmm.
Why? I didn't declare it const or readonly?