Using substring on string manipluation

Question

I have a string that has a string length of 66

Then I display it, using this one:

string.Substring(0, 20);
string.Substring(21, 40);
string.Substring(41, 60); --Error here
string.Substring(61, string.Length)

Why do I get an error saying that. Index and length must refer to a location within the string. Parameter name: length

Any ideas? Thanks!

The second parameter should be the length. So, if you start from 41 and go up to 60 length, you will get an exception, Since your total string length should be at least 41+60 — sarwar026
– sarwar026, Commented Oct 12, 2013 at 13:16

Raphaël Althaus · Accepted Answer · 2013-10-12 13:29:45Z

1

well,

first argument for substring is the start position

second argument for substring is the length, not the end position

41 + 60 = 101 => it's a little bit more than 66.

you should use

string.Substring(0, 20);
string.Substring(21, 20);
string.Substring(41, 20); 
string.Substring(61, 5);

Edit :

const int Length = 20;
var str = "myString";
var i = 0;
var list = new List<string>();
do {
  list.Add(str.Substring(i *Length, Math.Min(str.Length - (i*Length), Length)));
  i++;
}while (str.Length > i*Length);

edited Oct 12, 2013 at 13:29

answered Oct 12, 2013 at 13:17

Raphaël Althaus

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4 Comments

Luke Villanueva Over a year ago

I want to divide a strinng by 20 characters. No matter how long it is. So a long string will break down into series of string lines

Luke Villanueva Over a year ago

So I should not use subtring if I want to divide it by atleast 20 characters

Raphaël Althaus Over a year ago

@ljpv14 see edit, you'll have the idea (use Math.Min to avoid exception in substring)

TDull Over a year ago

@Raphaël Althaus code will do exactly what your after, for strings of any length..

brent · Accepted Answer · 2013-10-12 13:26:32Z

0

The second parameter in C#'s substring method is length, in the last two examples there are not that many characters left to take a substring of.

answered Oct 12, 2013 at 13:26

brent

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