c# - 如果未选中父节点，如何取消选中子节点？

Question

如果父节点未选中，我想取消选中子节点。根据我的代码，如果我检查了子节点父节点被选中。这是写入方式，但是当我取消选中父节点时，子节点仍然处于选中状态。我在 AfterCheck 事件中做了一些以下代码。

private bool updatingTreeView;
        private void treSelector_AfterCheck(object sender, TreeViewEventArgs e)
        {
            if (updatingTreeView) return;
            updatingTreeView = true;
            SelectParents(e.Node, e.Node.Checked);
            updatingTreeView = false;
        }

private void SelectParents(TreeNode node, Boolean isChecked)
        {
            var parent = node.Parent;

            if (parent == null)
            {
                //CheckAllChildren(treSelector.Nodes, false);
                return;
            }

            if (isChecked)
            {
                parent.Checked = true; // we should always check parent
                SelectParents(parent, true);
            }
            else
            {
                if (parent.Nodes.Cast<TreeNode>().Any(n => n.Checked))
                    return; // do not uncheck parent if there other checked nodes

                SelectParents(parent, false);
            }
        }

如何解决这个问题？

Answer 1

我认为您可以编写另一种方法，如下所示：

void checkChildNodes(TreeNode theNode, bool isChecked)
{
    if (theNode == null) return;
    theNode.Checked = isChecked;
    foreach(TreeNode childNode in theNode.Nodes)
    {
        checkChildNodes(childNode, isChecked);
    }
}

Answer 2

我之前在 aftercheck 事件中添加了以下代码updatingtreeview=false

 if (e.Node.Checked==false)
            {
                if (e.Node.Nodes.Count > 0)
                {
                    /* Calls the CheckAllChildNodes method, passing in the current 
                    Checked value of the TreeNode whose checked state changed. */
                    this.CheckAllChildNodes(e.Node, e.Node.Checked);
                }
            }

方法是

private void CheckAllChildNodes(TreeNode treeNode, bool nodeChecked)
        {
            foreach (TreeNode node in treeNode.Nodes)
            {
                node.Checked = nodeChecked;
                if (node.Nodes.Count > 0)
                {
                    // If the current node has child nodes, call the CheckAllChildsNodes method recursively. 
                    this.CheckAllChildNodes(node, nodeChecked);
                }
            }
        }

它工作正常..