Length of clines[i] is 69
I have initialized index = 50
Code:
string substr = clines[i].Substring(index, clines[i].Length);
Now I want substring from index 50 to 69
But I am getting below exception
ArgumentOutOfRangeException: Index and length must refer to a location within the string. Parameter name: length
why I am getting this exception?
The immediate cause of the error in your code is that index + clines[i].Length must not exceeds actual string's length which is clines[i].Length and that's why you're going to have the error for every non-zero index.
Try dropping the last argument (if you want to get the substring starting from the index and up to the end):
string substr = clines[i].Substring(index);
Edit: A (wordy) alternative with two arguments is
string substr = clines[i].Substring(index, clines[i].Length - index);
Please, notice that the last argument is the length of the substring, not of the original one.
string substr = clines[i].Substring(index, clines[i].Length - index); but why bother with the last argument when you have a sutable method's overload? Since .Net provides Substrting(index) method which means "starting from index and up to the end", why don't we use it?
In C#, the second argument represents the length of the segment you want to take, not the index to which you want the segment to extend to.
Also, if you want the right part of the string -- you can just leave off the second parameter.
clines[i].Substring(50, 19);
Substringis not(from, to). It's(from, howmany)Reading the actual documentation could have answered you, rather than creating this question.