I'm having trouble correctly implementing a CustomNodeSorter for a
treeview control.
I've got a TreeView control where each TreeNode has as its Tag an object
(TreeItem) that I made. One of the properties of TreeItem is 'IsFolder'
for indicating if the TreeNode acts as a folder in the custom treeview
I'm implementing.
For nodes displayed in the treeView, I desire that nodes be arranged
such that in any branch, the folder nodes are shown first in
alphabetical order and then the non folder nodes are shown in
alphabetical order - just like in Windows Explorer.
However, I'm not implementing the CustomNodeSorter correctly. Can
someone please point out the adjustments I need to make?
Sincerely,
Peter
------------------------------
public class CustomNodeSorter : IComparer
{
/// <summary>
/// This custom node sorter always shows a tree node with
folders first and sorted alphabetically.
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public int Compare ( object x, object y )
{
TreeNode tx = ( TreeNode ) x;
TreeNode ty = ( TreeNode ) y;
TreeItem tix = ( TreeItem ) tx.Tag;
TreeItem tiy = ( TreeItem ) ty.Tag;
// Separate folders from other nodes.
if ( tix.IsFolder & !tiy.IsFolder )
{
return 1;
}
if ( !tix.IsFolder & tiy.IsFolder )
{
return -1;
}
// Neither or both are folders so compare alphabetically.
return string.Compare ( tx.Text, ty.Text );
}
}
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