Sorting Windows.Forms.ListView by second column

Question

I want to sort ListView items by the content of second column (which can be either "Online" or "Offline"). Sorting will be done only in one specific place in code, so the solution doesn't have to be flexible. More than that, it should be easy to implement and not requiring major changes in rest of application.

I tried to make class implementing IComparer and assign it to listView.ListViewItemSorter, but it doesn't work for me.

Code sample:

class ChannelSorter : System.Collections.IComparer
{
    public int Compare(object a, object b)
    {
        if ((a as ListViewItem).SubItems[0].Text.CompareTo("Online") == 0)
            if ((b as ListViewItem).SubItems[0].Text.CompareTo("Online") == 0)
                return 0;
            else
                return -1;
        else if ((b as ListViewItem).SubItems[0].Text.CompareTo("Online") == 0)
            return 1;
        else
            return 0;
    }
}


// in constructor of Form1
listView1.ListViewItemSorter = new ChannelSorter();

You forgot to (re)assign the Sorting property.

Hans Passant
– Hans Passant

2012-06-27 21:14:10 +00:00
Commented Jun 27, 2012 at 21:14 — Hans Passant
– Hans Passant, Commented Jun 27, 2012 at 21:14

pikzen · Accepted Answer · 2012-06-27 20:56:37Z

1

You can use LINQ, with the OrderBy method:

I suppose your users in the list are coming from an User[] array or a List, or any Enumerable. You then simply use the OrderBY method to get a new ordered List:

var currentUsers = new List<User>();
// Fill your users
// Super happy fun sorting time!
var sortedUsers = currentUsers.OrderBy(user => user.State);

Where user.State is their current state (Online, Offline)

answered Jun 27, 2012 at 20:56

pikzen

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2 Comments

Xirdus Over a year ago

"Users"... What made you think it's about users? ;) Anyway, that works. Thanks a lot!

pikzen Over a year ago

I would have suggested Penguins or Servers, but I liked the human side of the thing :)

Dusan · Accepted Answer · 2012-06-27 21:00:43Z

0

Your function should contain only one line:

return (a as ListViewItem).SubItems[0].Text.CompareTo((b as ListViewItem).SubItems[0].Text)

answered Jun 27, 2012 at 21:00

Dusan

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