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Enumerable.Select

Posted on 2010-09-21
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Last Modified: 2013-11-11
How to print only the digits from the ID field?
(without using basic substring and indexOf functions to check each ID)

            DataTable dt = new DataTable();
            dt.Columns.Add("ID", typeof(String));
            dt.Rows.Add("USB22345");
            dt.Rows.Add("USC33399");
            dt.Rows.Add("USD66777");

            var query = from c in dt.AsEnumerable()
            select c["ID"];

            foreach (string item in query)
                Console.WriteLine(item.Select(c => char.IsDigit(c)));

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Question by:mawingpui
2 Comments
 
LVL 16

Assisted Solution

by:kris_per
kris_per earned 500 total points
ID: 33726094

            foreach (string item in query)
            {
                char[] numsArray = item.ToCharArray().Where(c => char.IsDigit(c)).ToArray();
                string numString = new StringBuilder().Append(numsArray).ToString();
                Console.WriteLine(numString);
            }

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LVL 12

Accepted Solution

by:
kumar754 earned 500 total points
ID: 33726907
try this:

foreach (string item in query)
                Console.WriteLine(string.Join( null,System.Text.RegularExpressions.Regex.Split( item, "[^\\d]" ) ));
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