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How can I select/unselect treeview checkboxes

Posted on 2006-11-25
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Last Modified: 2008-03-04
Hi,

I have a product list treeview, which contains checkbox for each item. What I'm trying to accomplish is when a treeview checkbox is selected/unselected, I want all the subitems checkboxes' selected/unselected as well.

How may I do that?

Please help. Thanks.
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Question by:i950
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Ravi Singh earned 2000 total points
ID: 18013145
Hi, you need to handle the TreeView controls AfterCheck event and call a recursive method that selects all the child nodes. To create the event handler automatically, select the TreeView control in design mode, then click the lightning bolt icon in the Property panel... double click the AfterCheck event and the event handler should be created like below (you'll need to copy the code in). The following should work:

private void treeView1_AfterCheck(object sender, System.Windows.Forms.TreeViewEventArgs e)
{
      if (e.Action == TreeViewAction.ByMouse || e.Action == TreeViewAction.ByKeyboard)
            this.CheckUncheckChildNodes(e.Node, e.Node.Checked);
}

private void CheckUncheckChildNodes(TreeNode tn, bool checkState)
{
      tn.Checked = checkState;
                  
      foreach (TreeNode tnChild in tn.Nodes)
            CheckUncheckChildNodes(tnChild, checkState);
}
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Expert Comment

by:Ravi Singh
ID: 18013150
clarification: in my first sentence I meant that the code checks/unchecks the child nodes based on the parent nodes checked state
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Author Comment

by:i950
ID: 18013268
Hi,

It's working but there's something that I thought was automatic is missing! When I have an sub item check and it's parent unchecked, I though the parent will show a green rectangle in the checkbox (in the place of the check mark, like it's the case in VS.NET installation), but that's no the case.

Is that an easy thing to do or a custom control should be created?

Thank you very much.
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Author Comment

by:i950
ID: 18013552
Here's a picture of what I'm talking about:

http://www.codeproject.com/cs/miscctrl/treeviewadv/treeviewadv3.png
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LVL 18

Expert Comment

by:Ravi Singh
ID: 18014088
Hi, I'm not sure, it doesn't seem to be a built in feature in .NET 1.1 or .NET 2's TreeView controls... I think its a custom feature, you might want to try using the TreeView control that you provided a link for:

http://www.codeproject.com/cs/miscctrl/treeviewadv.asp
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