C#------获取最后一个"/"字符后面的所有内容

public ActionResult GetFile(string id)
        {
            var path = _db.MailAtchs.Where(p => p.MailID == new Guid(id)).Select(p => p.Path);

            //获取文件名字
            ArrayList n = new ArrayList();
            foreach (var li in path)
            {
                var index = li.LastIndexOf('/');
                var pa = li.Substring(index + , li.Length - index - );
                n.Add(pa);
            }

            var info = new {FName = n, FPath = path };
            return Json(info, JsonRequestBehavior.AllowGet);
        }