C# 将完整树视图设置为剪贴板

我正在使用windows窗体，我想复制整个树视图及其子视图，并在

KeyDown

事件中按剪贴板中设置的顺序进行复制

首先，我尝试将父节点设置为：

  private void tvProjectList_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyData == (Keys.C))
            {
                var treeViewParents = "";
                foreach (TreeNode tn in tvProjectList.Nodes)
                {
                    treeViewParents += tn.Text + Environment.NewLine;
                }
                Clipboard.SetText(treeViewParents);

            }
        }

但它只得到一个节点，而不是所有节点。我该怎么做？问候

更新：

为了得到节点和它们的子节点，我有

   private void tvProjectList_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyData == (Keys.C))
            {

                foreach (TreeNode node in tvProjectList.Nodes)
                {
                    PrintNodesRecursive(node);
                }
            }
        }



 public void PrintNodesRecursive(TreeNode oParentNode)
        {
            Console.WriteLine(oParentNode.Text);

            var treeViewParents = "";
            StringBuilder sb = new StringBuilder();

            // Start recursion on all subnodes.
            foreach (TreeNode oSubNode in oParentNode.Nodes)
            {
                sb.Append(oSubNode.Text + Environment.NewLine);
                 PrintNodesRecursive(oSubNode);
            }
            Clipboard.SetText(sb.ToString());

        }

---

但是字符串生成器总是带有空字符串。。。为什么数据不保存在字符串生成器中？关于扩展我的评论，下面是一个实现递归方法的示例：

private void CopyTreeViewToClipboard(TreeView treeView)
{
    // Make a StringBuilder to store the text of each individual node
    var treeViewStringBuilder = new StringBuilder();

    // Initiate the recursive method
    GetTreeViewNodesText(treeView.Nodes, treeViewStringBuilder);

    // because StringBuilder is a reference type we do not need use a return value 
    //   and we can copy to clipboard using the already existing reference
    Clipboard.SetText(treeViewStringBuilder.ToString());
}

private void GetTreeViewNodesText(TreeNodeCollection nodesInCurrentLevel, StringBuilder sb, int level = 0)
{
    foreach (TreeNode currentNode in nodesInCurrentLevel)
    {
        // Add some padding (spaces) in front to display the current level
        sb.Append(new string(' ', level * 2));
        // Add the text and terminate the line \n\r
        sb.AppendLine(currentNode.Text);

        // Recursion happens here, it's level + 1 instead of level++ because we
        //   do not want to alter the level for the next nodes in nodesInCurrentLevel
        GetTreeViewNodesText(currentNode.Nodes, sb, level + 1);
    }
}

---

试着写一封信。然后您可以写入这些节点，并使用

StringBuilder

对其进行压缩。您正在

PrintNodesRecursive

递归方法中创建一个新的

StringBuilder

，这将为树视图中的每个节点创建一个，并最终将该级别的文本复制到剪贴板。方法完成后，剪贴板上将只显示最后一个TreeNode的第一级。相反，您应该在调用递归方法之前创建一个递归方法，并在每次调用中使用该方法。