C# - Substring: index and length must refer to a location within the string

Question

I have a string that looks like

string url = \"www.example.com/aaa/bbb.jpg\";

\"www.example.com/\" is 18 fixed in length. I want to get th

Answer 1

Your mistake is the parameters to Substring. The first parameter should be the start index and the second should be the length or offset from the startindex.

string newString = url.Substring(18, 7);

If the length of the substring can vary you need to calculate the length.

Something in the direction of (url.Length - 18) - 4 (or url.Length - 22)

In the end it will look something like this

string newString = url.Substring(18, url.Length - 22);