//显示一个消息框，要求输入一个字符串作为标签
private void 添加标签ToolStripMenuItem_Click(object sender, EventArgs e)
{
int i = Folder_listBox.SelectedIndex;
inputForm form = new inputForm((Folder)FolderArray[i]);
form.ShowDialog();
form.Dispose();
}
//添加一个标签到该folder，并更新tag_listView控件
private void btn_addTag_Click(object sender, EventArgs e)
{
inputForm form = new inputForm(folder);
form.ShowDialog();
form.Dispose();
//此处需要添加函数来重绘tag_listView
taglistview_refresh();
}