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C# - How to remove duplicates from a string

Posted on 2014-10-29
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Last Modified: 2014-10-29
Hi..
I have a string of email addreses with duplicates like this.
How can I remove the dups.. maybe use Split and LINQ?

"jon@abc.com; mary@xyz.com ; jon@ABC.com;  MARY@xyZ.com"

I want to return
"jon@abc.com; mary@xyz.com"

thx
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Question by:JElster
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Accepted Solution

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Snarf0001 earned 300 total points
ID: 40412149
Give this a shot:

            var dupes = "jon@abc.com; mary@xyz.com ; jon@ABC.com;  MARY@xyZ.com";
            dupes = string.Join(";", dupes.Split(new char[] { ';'}, StringSplitOptions.RemoveEmptyEntries).Select(d=> d.ToLower().Trim()).Distinct());

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Assisted Solution

by:David L. Hansen
David L. Hansen earned 200 total points
ID: 40412157
Sure.  When you use the Split function the result is an array of strings (for you just use the semicolon as the delimiter)...like this:
string[] emails = yourEmailList.Split(';');
string[] uniqueEmails = emails.Distinct().ToArray();

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LVL 22

Expert Comment

by:Snarf0001
ID: 40412172
You have to convert to lowercase as per my example, otherwise it's not going to trim out the case differences.
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LVL 15

Expert Comment

by:David L. Hansen
ID: 40412185
Yes, in my code just add a ".ToLower" right inbetween "yourEmailList" and "Split".  Thanks Snarf.
string[] emails = yourEmailList.ToLower.Split(';');

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