String.Join 和 Distinct 方法 去除字符串中重复字符

Qualys项目中写到将ServerIP以“,”分割后插入数据库并将重复的IP去除后发送到服务器进行Scan,于是我写了下面的一段用来剔除重复IP:

//CR#1796870 modify by v-yangwu, remove the IPs which are repeated.
                string[] arrayIP = ipAll.Split(',');
                List<string> listIP = new List<string>();
                foreach (string ip in arrayIP)
                {
                    if (!listIP.Contains(ip))
                    {
                        listIP.Add(ip);
                    }
                }
                string ipAllNew = listIP[0];
                for (int ipaccount = 1; ipaccount < listIP.Count(); ipaccount++)
                {
                    ipAllNew += "," + listIP[ipaccount];
                }
                ipAll = ipAllNew;
                //CR#1796870 End

项目组PM给我做的codeReview，给我做了Code improvement，把这是几行代码，用下面一行代码给替换掉了，真牛掰！

ipAll = String.Join(",", ipAll.Split(',').Distinct());

谢谢陈老师！留此纪念！