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TreeView Control in C#

Posted on 2006-06-30
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Last Modified: 2010-04-16

Hi all,

I would like to know how to access all the selected nodes in a tree view control in C#. I have tree with some nodes. I select some of them by using control key, but I am having trouble in my c# program to get access to all the selected tree nodes. It seems like I can only select one  node at a time.

How do I get around this problem ??

Thank you for your help in advance.


Ramesh
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Question by:Ramesh4u
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aaronfeng earned 200 total points
ID: 17022694
Yes, you are correct for Winform.  You can not retrieve all selected nodes at once, only one at a time.  You will have to traverse all the nodes in order to find all the selected nodes.  In the past, I wrapped the TreeView control, so I can add this functionality in one place; however, you can just create a function to do it for you.

You would do something like this:

private void FindAllCheckedNodes(List<TreeNode> outputNodes, TreeNodeCollection parentNodes) {
  foreach (TreeNode node in parentNodes) {
    if (node.SelectedNode) {
      outputNodes.Add(node);
    }
    FindAllCheckedNodes(outputNodes, node.Nodes);
  }
}

outputNodes will contain all the selected nodes when the function is done running.  You will pass in the root node as the second argument.

Cheers,

Aaron
http://geekswithblogs.net/afeng/
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