Question

Tree
   |
    A-A1
     -A2
   |
    B-B1
     -B2
     -B3
    |
    C-C1
     -C2


        private void treeView1_AfterLabelEdit(object sender, NodeLabelEditEventArgs e)
        {
            foreach (TreeNode tn in treeView1.Nodes)
        {
            if (!tn.Equals(e.Node) && tn.Text.ToUpper() == e.Label.ToUpper() )
            {
                MessageBox.Show("Name already available for parent. Cannot give same name.", "Rename element");
                e.CancelEdit = true;
                return;
            }
        }
        string l_strOldDisplayName = treeView1.SelectedNode.Text;
        this.BeginInvoke(new Action(() => RenameTreeElement(l_strOldDisplayName, e.Node)));
        treeView1.LabelEdit = false;
        treeView1.SelectedNode.EndEdit(false);
        }
        private void RenameElement(string f_strOldDisplayName, TreeNode updatedNode)
        {                           

            foreach (TreeNode currentNode in treeView1.Nodes)
            {
                if (currentNode.Level == 0)
                {
                    if (updatedNode.Text == currentNode.Text)
                    {
                        MessageBox.Show("Name already available for parent. Cannot give same name.", "Rename element");
                        return;
                    }
                }                  
            }
}

我在0级（A，B，C）重命名树节点（A到B），但是当时我想在树视图中显示B我要显示消息“名称已经可用于父级。不能给出相同的名称。“

因为我已经写了上面的代码，但是当我给父节点名称'A'给树中任何不允许的子节点说'A'时它是失败的。它应该允许因为父名称可能在子节点中重复< / p>

更新了代码........

void treeView1_AfterLabelEdit(object sender, NodeLabelEditEventArgs e) {
  foreach (TreeNode tn in treeView1.Nodes) {
    if (!tn.Equals(e.Node) && tn.Text == e.Label&& !IsChildNodeHaveSameName(e.Label, e.Node)) {
      MessageBox.Show("Name already in use.");
      e.CancelEdit = true;
    }
  }
}

 private bool IsChildNodeHaveSameName(string newName)
        {//if new parent node name is under child node then skip
            foreach (var node in Collect(treeView1.Nodes))
            {
                if (node.Text.ToUpper() == newName.ToUpper())
                {
                    return true;
                }
            }
            return false;
        }

        IEnumerable<TreeNode> Collect(TreeNodeCollection nodes)
        {
            foreach (TreeNode node in nodes)
            {
                yield return node;

                foreach (var child in Collect(node.Nodes))
                    yield return child;
            }
        }

Answer 1

e.Label属性为您提供用户在浮动标签中写入的文本。有了它，您可以将代码简化为：

void treeView1_AfterLabelEdit(object sender, NodeLabelEditEventArgs e) {
  if (e.Node.Level == 0) {
    foreach (TreeNode tn in treeView1.Nodes) {
      if (!tn.Equals(e.Node) && tn.Text == e.Label) {
        MessageBox.Show("Name already in use.");
        e.CancelEdit = true;
      }
    }
  }
}

在零级别的树视图中验证具有相同名称的节点

1 个答案: