create new list from parent list

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I have a List Contain 'N' values like

Pre-aa,Post-aa,Normal-aa,Post-aa,Normal-aa,Normal-aa,Post-aa,Pre-aa,Post-aa,Pre-aa,Post-aa,Post-aa,Normal-aa,Normal-aa....etc

How to create a seperate new list for each Pre-aa, Post-aa and Normal-aa from the parent List.

Please Help

Thanks in Advance

Posted 28-Jan-15 21:06pm

Renjith_R

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Sergey Alexandrovich Kryukov 29-Jan-15 3:09am

What have you tried so far?
—SA

Zoltán Zörgő 29-Jan-15 16:40pm

"aa" is just "aa" or they represent some pattern?

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sashje- · Answer 1 · 2015-01-28T21:15:00

Example using Linq.

C#

using System;
using System.Collections.Generic;
using System.Linq;

C#

private static List<List<string>> Split(IList<string> source)
        {
            if (source == null || source.Count == 0)
            {
                return null;
            }            
            else
            {
                return source
                    .Select(x => x)
                    .GroupBy(x => x)
                    .Select(x => x.ToList())
                    .ToList();
            }
        }
static void Main(string[] args)
        {
            List<string> array = new List<string>();
            array.Add("Pre-aa");
            array.Add("Post-aa");
            array.Add("Normal-aa");
            array.Add("Post-aa");
            array.Add("Normal-aa");
            array.Add("Normal-aa");
            array.Add("Post-aa");
            array.Add("Pre-aa");
            array.Add("Post-aa");
            array.Add("Pre-aa");
            array.Add("Post-aa");
            array.Add("Post-aa");
            array.Add("Normal-aa");
            array.Add("Normal-aa");
            var result = Split(array);
            // Results in three Lists


}