How does Array.Reverse work?

Question

I have this simple piece of code..

bool isTrue(char[] number)
{
    char[] reverse = number;
    Array.Reverse(reverse);
}

When debugging the application I saw that number is reversed too. Can someone explain to me why? Is it related to how char arrays work, or am I missing something?

@SonerGönül - `number` is a reference to the array in the code. — Jamiec, Jul 22 '15 at 14:22
You can read about parameter passing here: http://www.yoda.arachsys.com/csharp/parameters.html — default, Jul 22 '15 at 14:35
and about arrays in C# here: http://stackoverflow.com/q/1533757/238902 — default, Jul 22 '15 at 14:37

score 5 · Accepted Answer · answered Jul 22 '15 at 14:22

5

With

char[] reverse = number;

you are not creating a copy of the array, but just another reference to it.

If you want to copy the array, you can use .Clone():

char[] reverse = number.Clone();

answered Jul 22 '15 at 14:22

Glorfindel

21,988
13
81
109

Thank you. Does that only happens with char arrays? or is it the same with int arrays and other type of arrays? – WT86 Jul 22 '15 at 15:53
1

This is true for all arrays, regardless of type. – Glorfindel Jul 22 '15 at 15:53
Thank you for the inofrmation – WT86 Jul 22 '15 at 15:56

score 2 · Answer 2 · answered Jul 22 '15 at 14:32

2

Try using number.CopyTo(reverse, 0) instead of char[] reverse = number;

answered Jul 22 '15 at 14:32

Bahadir Acar

66
5

How does Array.Reverse work?

2 Answers2