转换格式
string time="2012-05-17 20:00:30";
如何将字符串转为：20120517200030

[解决办法]
string time = "2012-05-17 20:00:30";
DateTime a = DateTime.ParseExact(time, "yyyy-MM-dd HH:mm:ss",null);
MessageBox.Show(a.ToString("yyyyMMddHHmmss"));