System.ArgumentOutOfRangeException: startIndex cannot be larger than length of string

Question

I have this code. I am trying to retrieve just the text \"first program\". Considering that i know the index say 25 and total length of string is 35.

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Answer 1

During this time you can use

(LINQ ElementAt) and (ElementAtOrDefault) method. However the ElementAt extension method would throw the System.ArguementOutOfRangeException when the specified index is a negative value or not less than the size of the sequence .

Answer 2

Second argument for SubString is the number of characters in the substring.

Simpler way to do it.

int startIndex = 25; // find out startIndex
int endIndex = 35;   // find out endIndex, in this case it is text.Length;
int length = endIndex - startIndex; // always subtract startIndex from the position wherever you want your substring to end i.e. endIndex

// call substring
Response.Write(text.Substring(startIndex,length));     

you can do some operation or call a function to get start/end index values. With this approach you are less likely to get into any trouble related to indexes.

Answer 3

The parameters for String.Substring are:

public string Substring(int startIndex, int length)

You're trying to take 35 characters after the 26th character (startIndex is zero-based), which is out of range.

If you just want to get from the 25th character to the end of the string use text.SubString(24)

Answer 4

The second parameter to Substring is how long you want the substring to be, not the end point of the substring. 25 + 35 is outside the range of the original string, so it throws an exception.

Answer 5

Second argument to string.Substring() is the length, not the end-offset:

Response.Write(text.Substring(25, 10));