Set full treeview to clipboard

Question

I'm working with windows forms and I want to copy entire tree view with their childrens in order set in clipboard in KeyDown event

First I try to set parent nodes as:

  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);

            }
        }

But it just get one node instead all nodes. How am I supposed to do it? Regards

Update:

In order to get Nodes and their childrens I have

   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());

        }

But string builder always come with empty string... Why data is not saved in string builder? Regards

Answer 1

扩展我的评论，下面是实现此目的的递归方法的示例实现：

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);
    }
}