C# IndexOutOfRangeException while accessing datas in array

Question

I have the following code :

String[] enteteSplit = new String[48];
enteteSplit = entete.Split(';');
enteteSplit[35] = enteteSplit[35].Replace(',', '.');

Where entete is a string. The 3rd line is throwing an IndexOutOfRangeException and i couldn't resolve this, any ideas ?

Thanks a lot.

Well, it appears there are less than 36 items in enteteSplit. — Frédéric Hamidi
– Frédéric Hamidi, Commented Feb 10, 2015 at 15:16
enteteSplit has less than 36 items in it. Your first line doesn't matter since Split() just returns a new array. — Golden Dragon
– Golden Dragon, Commented Feb 10, 2015 at 15:16
I also tried doing : String[] enteteSplit = entete.Split(';'); enteteSplit[35] = enteteSplit[35].Replace(',', '.'); And i checked that 'entete' had more than 35 ';' and it is still not working. I also checked that 'enteteSplit[35]' had something in it. — Stan
– Stan, Commented Feb 10, 2015 at 15:27

Steve · Accepted Answer · 2015-02-10 15:17:25Z

3

When you call this line

enteteSplit = entete.Split(';');

you are effectively creating an array that contains no more 48 elements but just the elements obtained splitting the string at the semicolon character.

So if your string is

entete = "test;test1;test2";
enteteSplit = entete.Split(';');

the resulting array has only 3 elements and thus trying to reach the 35th element causes the IndexOutOfRange Exception

You need to introduce a safety check here

if(enteteSplit.Length > 35)
   enteteSplit[35] = enteteSplit[35].Replace(',', '.');

answered Feb 10, 2015 at 15:17

Steve

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1 Comment

Stan Over a year ago

It seems that adding the safety check has resolved my problem. Thank you :)

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