CODEWITHSUNDEEP
c#windowswinformstreeview
Dan Gifford
Dan Gifford

Reputation: 896

Treeview.SelectedNode not working properly

I'm trying to create a custom acting TreeView. When you click a node it should toggle as selected/unselected. Currently I can select a node once by clicking it, deselect the node by clicking it again, but I am unable to select the node again via clicking unless I select another node first. Any help would be greatly appreciated.

TreeNode lastNode;

private void treeViewMS1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
{
    if (lastNode == e.Node)
    {
        treeViewMS1.SelectedNode = null;
        lastNode = null;
    }
    else
    {
        if (lastNode == null)
        {
            treeViewMS1.SelectedNode = e.Node;
        }
        lastNode = e.Node;
    }
}

Upvotes: 1

Views: 1216

Answers (1)

LarsTech
LarsTech

Reputation: 81610

Try using the BeginInvoke procedure to delay the action until after the mouse click event is done processing. It's probably interfering:

TreeNode lastNode;
private void treeView1_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e) {
  this.BeginInvoke(new Action(() => {
    if (lastNode == e.Node) {
      treeView1.SelectedNode = null;
      lastNode = null;
    } else {
      if (lastNode == null) {
        treeView1.SelectedNode = e.Node;
      }
      lastNode = e.Node;
    }
  }));
}

If the Action method isn't available, you can use the MethodInvoker style:

this.BeginInvoke((MethodInvoker)delegate {

Upvotes: 1

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