Concatenate Two List & sort concatenated list on the basis of first List.

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Concatenate Two List & sort concatenated list on the basis of first List.

Suppose First List Data is :
List1 = [21]
[24]
[23]
[26]

Suppose Second List Data is :
List2 = [21]
[32]
[38]
[26]
[25]

List1 and List2 after concatenation i.e
List3 = [21]
[24]
[23]
[26]
[21]
[32]
[38]
[26]
[25]

My query is I want result of the list after sorting in this Fashion : -
List3= [21]
[21]
[24]
[23]
[26]
[26]
[32]
[38]
[25]

Posted 12-Aug-12 19:48pm

Aditya Magotra

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3 solutions

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Abhinav S · Answer 1 · 2012-08-12T20:05:00

Solution 1

Some of these links might help -
http://www.cs.nyu.edu/~vs667/articles/mergesort/[^]
http://www.java2s.com/Tutorial/C/0140__Array/Mergingoftwosortedlists.htm[^]
http://en.csharp-online.net/Merge_Sort[^]

Posted 12-Aug-12 20:05pm

Abhinav S

Skvignesh · Answer 2 · 2012-08-12T20:33:00

C#

ArrayList al = new ArrayList();

       for (int i = 0; i < ListBox1.Items.Count; i++)
       {
           al.Add(ListBox1.Items[i].ToString());
       }
       for (int i = 0; i < ListBox2.Items.Count; i++)
       {
           al.Add(ListBox2.Items[i].ToString());
       }
       al.Sort();
       for (int i = 0; i < al.Count; i++)
       {
           ListBox3.Items.Add(al[i].ToString());
       }

Prabhakaran Soundarapandian · Answer 3 · 2012-08-12T20:06:00

Solution 2

Hi ,

Try this

C#

IList<int> List1 = new List<int>() { 5, 7, 1, 4 };
IList<int> List2 = new List<int>() { 3, 11, 9, 2 };
IList<int> Result = List1.Union(List2).OrderBy(p => p).ToList<int>();

Posted 12-Aug-12 20:06pm

Prabhakaran Soundarapandian

Comments

Philip Stuyck 13-Aug-12 2:12am

You are using the union operator, won't it exclude doubles ? The right solution is to use the concat operator.

Prabhakaran Soundarapandian 13-Aug-12 2:20am

Thanks Philip...