C# 处理重复字串

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#c# #string

string temp=",309,309,310,310,310,310,310,310,311,311,311";为原字串

要求处理结果为：,309,310,311,

string timetemp = null;

string temp=",309,309,310,310,310,310,310,310,311,311,311";

            string[] str = temp.Split(",".ToCharArray());
            String[] str1 = { "" };
            System.Collections.Specialized.StringCollection sc = new System.Collections.Specialized.StringCollection();
            sc.AddRange(str1);
            foreach (string s in str)
            {
                if (!sc.Contains(s))
                {
                    sc.Add(s);
                }
            }
            String[] str2 = new string[sc.Count];
            sc.CopyTo(str2, 0);
            foreach (string ss in str2)
            {
                timetemp +=","+ss;
                Console.WriteLine(ss);
            }

timetemp= timetemp.Insert(timetemp.Length, ",");
timetemp = timetemp.Remove(0,1);

还有个更简洁的方法

string timetemp = null;

string temp=",309,309,310,310,310,310,310,310,311,311,311";

string[] str = temp.Split(",".ToCharArray());
String[] str1 = { "" };

string[] str2 = str.Union(str1).Distinct().ToArray();
            foreach (string s in str2)
            {
                timetemp += "," + s;
            }
            timetemp = timetemp.Insert(timetemp.Length, ",");
            timetemp = timetemp.Remove(0, 1);
            Console.WriteLine(timetemp);