C#以逗号分割的方式对字符串去重

class Program
{
static void Main(string[] args)
{
string s = "101,102,103,104,105,101,102,103,104,105,106,107,101,108";
s = string.Join(",", s.Split(',').Distinct().ToArray());
Console.WriteLine("Linq以逗号分割对字符串去重:" + s);

string input = "101,102,103,104,105,101,102,103,104,105,106,107,101,108";
input = Regex.Replace(input + ",", @"(?:([^,]+,))(?=.*?\1)", "");
Console.WriteLine("正则表达式以逗号分割对字符串去重" + input.Substring(0, input.Length - 1));
Console.Read();
}
}