Case insensitive string search using contains

Question

I need to search a directory for files and folders that contain the entered text,

I can see that File.Name.Contains(txtSearch) is the one that i need, but the problem is that it doesn't return true when characters cases (lower/upper) don't match.

Although File.Name.Equals(txtSearch,StringComparison.InvariantCultureIgnoreCase) solves this problem it requires that the the search string should be exactly the same.

Can you add some examples of 'problem' strings and what you want them to do. The given information is pretty basic. — CodingBarfield, Apr 17 '12 at 10:35
possible duplicate of [Case insensitive contains(string)](http://stackoverflow.com/questions/444798/case-insensitive-containsstring) — Damith, Jun 21 '12 at 14:17

Robin Maben · Accepted Answer · 2012-04-17T10:34:06.193

3

var position =  File.Name.IndexOf(txtSearch, StringComparison.InvariantCultureIgnoreCase)

Where position will be greater than -1 if your "file name" contains any occurrence of the specified search string.

So..

if(position > -1){
    //found files, do something
}

edited Apr 17 '12 at 10:34

answered Apr 17 '12 at 10:28

Robin Maben

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Worked Perfect, it even returns more items than windows explorer! – Murhaf Sousli Apr 17 '12 at 10:37

score 0 · Answer 2 · edited Mar 07 '13 at 08:24

0

 var _reps = new List<string>(); // with variant data

_reps.ConvertAll<string>(new Converter<string,string>(delegate(string srt){srt= srt.ToLower(); return srt;})).Contains("invisible")

this is by far the cleanest way i could find to do it

edited Mar 07 '13 at 08:24

j0k

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answered Mar 07 '13 at 08:07

Uhlamurile

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Case insensitive string search using contains

2 Answers2