一个字符串中去掉相同的字符
如：
String str=“2，3，4，3，2，5”;
咋样去掉这里相同的2和3
就是最终要的结果是：
String s=“2，3，4，5”;
------解决方案--------------------

  String str="2,3,4,3,2,5";

            string[]  list = str.Split(',');

            string ret = string.Empty;



            ArrayList list1 = new ArrayList();

            for (int i = 0; i < list.Length; i++)

            {

                if (!list1.Contains(list[i]))

                {

                    list1.Add(list[i]);

                }

            }



            for (int i = 0; i < list1.Count; i++)

            {

                ret += list1[i] + ",";

            }

            Console.WriteLine(ret);

            Console.Read();

------解决方案--------------------

 string str = "2,3,5,3,6,7,6,8,5,4,3,2,1,89,54,3,2,45,12,345345,123123,34,3,3,2,";

            string[] stringArray  = str.Split(',');

            List<string> listString = new List<string>();

            foreach (string eachString in stringArray)

            {

                if (!listString.Contains(eachString))



                    listString.Add(eachString);



            }

            Console.WriteLine(string.Join(",", listString.ToArray()));

            Console.Read();

------解决方案--------------------
string str = "2,3,5,3,6,7,6,8,5,4,3,2,1,89,54,3,2,45,12,345345,123123,34,3,3,2,";
            string[] stringArray = str.Split(',').Distinct().ToArray();
......
------解决方案--------------------