返回不重复的元素数组以及判断字符串在数组中存在

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/// <summary>
        /// 返回不重复的元素数组
        /// </summary>
        /// <param name="arr"></param>
        /// <returns></returns>
        private string[] returnArr(string[] arr)
        {           
            ArrayList list = new ArrayList();
            for (int i = 0; i < arr.Length; i++)
            {
                bool IsExist = true; 
                for (int j = 0; j < list.Count; j++)
                {
                    if (list[j].ToString() == arr[i])
                    {
                        IsExist = false; 
                        break;
                    }
                }
                if (IsExist)
                    list.Add(arr[i]);
            }
            string[] Array = (string[])list.ToArray(typeof(string));

            return Array;
        }
       /// <summary>
       /// 判断字符串在数组中存在
       /// </summary>
       /// <param name="ss"></param>
       /// <param name="str"></param>
       /// <returns></returns>
        protected bool isExist(string[] ss, string str)
        {
            List<string> ls = new List<string>(ss);
            foreach (string s in ls)
            {
                if (ls.Contains(str))
                    return true;
            }
            return false;
        }