C#把ArrayList转换为逗号分隔的string

        static void Main(string[] args)
        {
            ArrayList arr = new ArrayList();
            arr.Add("算神");
            arr.Add("算神");
            arr.Add("算神");
            string str = string.Join(",", arr.ToArray(typeof(string)) as string[]);
            Console.WriteLine(str);
            Console.Read();
        }