15,122,559 members
Articles / Web Development / ASP.NET
Tip/Trick
Posted 9 Sep 2011

42K views
3 bookmarked

# ASP.NET TreeView Sort

Rate me:
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.

C#
```TreeView mytree = new TreeView();

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);
temp = null;
}
node.ChildNodes.Clear();
foreach (TreeNode a in childs)
}
catch { }
}```

## Share

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

 First Prev Next
 incorrect comparison Member 1024692319-Nov-14 4:04 Member 10246923 19-Nov-14 4:04
 compare full words Klimovec12-Apr-12 3:49 Klimovec 12-Apr-12 3:49
 Heyy it worked for me. Currently i have a treeview which pop... rjkumar19879-Jan-12 3:27 rjkumar1987 9-Jan-12 3:27
 Re: just replace the logical comparison "n.Text[0] < temp.Text[0... brunofer200715-Jan-12 0:59 brunofer2007 15-Jan-12 0:59
 just replace the logical comparison "n.Text[0] < temp.Text[0]" with other comparison logical. It have to be a TreeNode property.
 1-The datasource should be sort not the tree in asp.net. An... JoePatent13-Sep-11 9:03 JoePatent 13-Sep-11 9:03
 Re: 1 - Sometimes a TreeView doesn't have necessarily a datasour... brunofer200714-Sep-11 1:36 brunofer2007 14-Sep-11 1:36
 Could I ask, why can't you use the default TreeView Sort met... George Swan11-Sep-11 21:11 George Swan 11-Sep-11 21:11
 Re: Hello George, as you can see in the title, this solution is ... brunofer200711-Sep-11 23:21 brunofer2007 11-Sep-11 23:21
 Last Visit: 31-Dec-99 19:00     Last Update: 5-Dec-21 22:45 Refresh 1