private void button3_Click(object sender, EventArgs e)
{
//选择目录2
txtCombineRelaPath.Text = WinFormUtil.ShowFolderBrowserDialog() ?? txtCombineRelaPath.Text;
}
private void button2_Click(object sender, EventArgs e)
{
//打开目录2的基目录
txtCombineDir.Text = WinFormUtil.ShowFolderBrowserDialog() ?? txtCombineDir.Text;
}