#102 – Use Substring() to Extract Substrings From A String

The String.IndexOf method searched for the location of a substring in a larger string, given the substring.  You can use the Substring method to do the reverse–extract a substring, given its position in the larger string.

 string s = "Itsy bitsy spider";
 string s2 = s.Substring(5);  // bitsy spider  (start at 6th character, extract until end of string)
 s2 = s.Substring(5, 4);      // bits
 s.Substring(2, s.Length);    // throws ArgumentOutOfRangeException

Also note that the Substring method doesn’t change the original string, but just returns the substring asked for.


About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

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