匹配字串 公交2路_上_100.gif 怎么提取由2个下划线分割的3部分

            string test = "公交2路_上_100.gif";
            string[] result = test.Split(new char[] { '_' });
            foreach (string s in result)
            {
                richTextBox2.Text += s + "\n";
            }

------解决方案--------------------
string.Split('_')

------解决方案--------------------
YourStr.Split(new char[] { '_' });