您可以尝试以下操作:-

You can try this:-

System.Collections.ArrayList arl = new System.Collections.ArrayList(); 

protected void btnSave_Click(object sender, EventArgs e)
{

    foreach (TreeNode tn in TreeView1.Nodes)
    {
        if (tn.Checked)
        {
            arl.Add(tn.Text);
            fetchRecursiveChild(tn);
        }
        fetchRecursiveChild(tn);
    }

}

//需要递归获取每个节点

}

//need to fetch each node recursively

public void fetchRecursiveChild(TreeNode tn)
  {
      foreach (TreeNode ctn in tn.ChildNodes)
      {
          if (ctn.Checked)
          {
              arl.Add(ctn.Text);
          }
          fetchRecursiveChild(ctn);
      }
  }