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How to built-in sort generic collection using one of the attribute?

Posted on 2014-12-22
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Last Modified: 2014-12-23
Hi, I'm using vs2012
I have a collection, List<UserPrincipal>.  How can I use the the buit-in collection Sort function to sort the collection based on one of the attribute of UserPrincipal (SamAccountName)?  Looked at MSDN but didn't see any example code on how to do this.

Thank you.
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Question by:lapucca
7 Comments
 
LVL 33

Expert Comment

by:it_saige
ID: 40514116
This works for me:
using System;
using System.Collections.Generic;
using System.DirectoryServices.AccountManagement;
using System.Linq;

namespace EE_Q28585582
{
	class Program
	{
		private static List<UserPrincipal> users = new List<UserPrincipal>();

		static void Main(string[] args)
		{
			PrincipalContext context = new PrincipalContext(ContextType.Domain);
			UserPrincipal user = new UserPrincipal(context);
			PrincipalSearcher searcher = new PrincipalSearcher(user);
			foreach (Principal result in searcher.FindAll())
			{
				UserPrincipal upe = result as UserPrincipal;
				if (upe != null)
					users.Add(upe);
			}

			foreach (UserPrincipal up in users)
				Console.WriteLine(up.Name);
			Console.ReadLine();

			var usort = (from up in users orderby up.SamAccountName select up);
			foreach (UserPrincipal up in usort)
				Console.WriteLine(up.Name);
			Console.ReadLine();
		}
	}
}

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-saige-
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LVL 52

Accepted Solution

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Carl Tawn earned 500 total points
ID: 40514125
Try:
list.Sort(delegate(UserPrincipal a, UserPrincipal b) { return string.Compare(a.SAMAccountName, b.SAMAccountName); });

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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 40514146
*No Points*

Slightly shorter version of Carl's suggestion:

list.Sort((left, right) => string.Compare(left.SAMAccountName, right.SAMAccountName));

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Author Comment

by:lapucca
ID: 40514394
Carl,
That works great thank you.
Kaufmed, Your loc gives red underline.  Error message says can't convert because it's not delegate.
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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 40514407
It's possible you may need to include the type as well--usually you don't have to.

e.g.

list.Sort((UserPrincipal left, UserPrincipal right) => string.Compare(left.SAMAccountName, right.SAMAccountName));

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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 40514414
That's what I get for trying to do it from memory  ; )

Corrected:

s.Sort((left, right) => { return string.Compare(left.SamAccountName, right.SamAccountName); });

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Author Comment

by:lapucca
ID: 40515378
Hi, I have a new question related to this one, ID: 28586081
Appreciate it if you can have a look.
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