Click here to Skip to main content
15,041,525 members
Articles / Web Development / ASP.NET
Tip/Trick
Posted 9 Sep 2011

Stats

41.4K views
3 bookmarked

ASP.NET TreeView Sort

Rate me:
Please Sign up or sign in to vote.
5.00/5 (4 votes)
11 Sep 2011CPOL
Easy way to sort nodes in a TreeView using a recursive function.
A few days ago, I needed to sort the nodes of a tree view. The solutions that I found over the Internet did not please me, so I decided to write my own. This solution is a simple recursive function that sorts tree nodes in an alphabetic order.

Create your tree view and add your nodes:


C#
TreeView mytree = new TreeView();
//add your nodes here

Then simply call the sort function with the main node as the argument:


C#
sort(node);

Here is the recursive function:


C#
private void sort(TreeNode node)
{
    foreach (TreeNode n in node.ChildNodes)
        sort(n);
    try
    {
        TreeNode temp = null;
        List<TreeNode> childs = new List<TreeNode>();
        while(node.ChildNodes.Count>0)
        {
            foreach (TreeNode n in node.ChildNodes)
                if (temp == null || n.Text[0] < temp.Text[0])
                    temp = n;
            node.ChildNodes.Remove(temp);
            childs.Add(temp);
            temp = null;
        }
        node.ChildNodes.Clear();
        foreach (TreeNode a in childs)
            node.ChildNodes.Add(a);
    }
    catch { }
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

brunofer2007
Software Developer (Senior) Martifer Inovação e Gestão
Portugal Portugal
No Biography provided

Comments and Discussions

 
Questionincorrect comparison Pin
Member 1024692319-Nov-14 3:04
MemberMember 1024692319-Nov-14 3:04 
Suggestioncompare full words Pin
Klimovec12-Apr-12 2:49
MemberKlimovec12-Apr-12 2:49 
GeneralHeyy it worked for me. Currently i have a treeview which pop... Pin
rjkumar19879-Jan-12 2:27
Memberrjkumar19879-Jan-12 2:27 
GeneralRe: just replace the logical comparison "n.Text[0] < temp.Text[0... Pin
brunofer200714-Jan-12 23:59
Memberbrunofer200714-Jan-12 23:59 
General1-The datasource should be sort not the tree in asp.net. An... Pin
JoePatent13-Sep-11 8:03
MemberJoePatent13-Sep-11 8:03 
GeneralRe: 1 - Sometimes a TreeView doesn't have necessarily a datasour... Pin
brunofer200714-Sep-11 0:36
Memberbrunofer200714-Sep-11 0:36 
GeneralCould I ask, why can't you use the default TreeView Sort met... Pin
George Swan11-Sep-11 20:11
MemberGeorge Swan11-Sep-11 20:11 
GeneralRe: Hello George, as you can see in the title, this solution is ... Pin
brunofer200711-Sep-11 22:21
Memberbrunofer200711-Sep-11 22:21 
Hello George,
as you can see in the title, this solution is for ASP.NET TreeView control.
The method you mentioned works fine in WinForms Controls, but it's not present on this WebForm control.

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.