Sorting an Array of Custom Objects in C#
page 1 of 4
Published: 23 Jul 2008
Abstract
In this article Sandesh discusses the different ways of sorting an array of custom objects in C# using the IComparable and IComparer interfaces. Examples are provided on the simple case of sorting an array of built in data types and extends the example to custom objects. He demonstrates the concepts with the help of code samples along with relevant analysis for each one of them.
by Sandesh Meda
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Description

Consider a simple case of sorting an array of strings in C#. We can simply call the Sort() method to sort the array.

Listing 1

ArrayList carArray = new ArrayList();
carArray.Add("Corvette");
carArray.Add("Honda");
carArray.Add("BMW");
carArray.Sort();

If you observe the contents of the array after the Sort(), you will notice that the elements are sorted alphabetically ie., "BMW," "Corvette," "Honda."

However, consider a Car Class as shown in Listing 2.

Listing 2

class Car 
{
  public string Make { set; get; }
  public int Year { set; get; }
  public string Location { set; get; }
}

If you create an ArrayList of car objects and try to Sort() it, it would throw an exception. You will need to have the Car class implement the IComparable interface and define the CompareTo method to be able to sort custom objects.


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User Comments

Title: Great   
Name: peter
Date: 2011-09-02 5:41:56 AM
Comment:
Great great article
Title: Thanx   
Name: Stef
Date: 2010-02-03 4:10:36 PM
Comment:
This was a clear explanation..It helped me allot!
Title: nice post   
Name: simi
Date: 2009-12-30 2:13:53 AM
Comment:
hi,

First of all. Thanks very much for your useful post.

I just came across your blog and wanted to drop you a note telling you how impressed I was with the information you have posted here.

Please let me introduce you some info related to this post and I hope that it is useful for .Net community.

There is a good C# resource site, Have alook

http://www.csharptalk.com/2009/09/c-array.html
http://www.csharptalk.com/2009/10/creating-arrays.html

simi
Title: Mast hai   
Name: Niraj kumar
Date: 2009-06-05 8:58:00 AM
Comment:
Best explanation
Title: Well Done   
Name: jj
Date: 2009-06-03 2:28:54 AM
Comment:
This is good work
Title: Excelent   
Name: Awais Ranjha
Date: 2009-05-11 4:52:25 PM
Comment:
This is a great help. i am really thankful to the author. Really excellent article. Thanks a lot!
Title: Coustom object   
Name: shatendra singh
Date: 2009-05-02 6:34:28 AM
Comment:
this is very well artical.
Title: Great   
Name: Anton
Date: 2009-01-14 2:13:57 PM
Comment:
Thnx, very helpful
Title: great explanation   
Name: Aga
Date: 2008-11-28 11:50:20 PM
Comment:
Thanks so much for giving great explanation of the subject!
Title: Useful one   
Name: Chennai Tours Travels
Date: 2008-10-20 3:56:09 AM
Comment:
Nice explanation Sandesh Meda
Good effort ..
Title: Nice one   
Name: Ravi Sadalagi
Date: 2008-08-12 6:05:44 AM
Comment:
good one thank you..
Title: Excellent   
Name: Nancy
Date: 2008-08-11 10:23:58 AM
Comment:
Makes a great attempt to explain sorting an array of custom objects in a very easy understandable way. Really excellent article. Thanks a lot!
Title: Mr   
Name: Amook Vandan
Date: 2008-08-11 4:46:47 AM
Comment:
good article
Title: good   
Name: Neetu Tiwari
Date: 2008-08-09 6:55:21 AM
Comment:
Its good.....thanks
Title: Mr   
Name: Priyan R
Date: 2008-07-29 2:18:41 AM
Comment:
Hi thanks good article






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