String.Split

public static class StringHelper
    {
        /// <summary>
        /// convert string to list by separators
        /// </summary>
        /// <param name="str">the string you want to deal with</param>
        /// <param name="separators">the separator  char array </param>
        /// <returns></returns>
        public static List<string> StringToListBySeparators(this string str, char[] separators)
        {
            string[] strs = str.Split(separators);
            List<string> liststr = new List<string>(strs);
            return liststr;
        }

        /// <summary>
        /// convert string to list by separators
        /// </summary>
        /// <param name="str">the string you want to deal with</param>
        /// <param name="separators">the separator  string </param>
        /// <returns></returns>
        public static List<string> StringToListBySeparators(this string str, string separators)
        {
            string[] strs = Regex.Split(str, separators, RegexOptions.IgnoreCase);
            List<string> liststr = new List<string>(strs);
            return liststr;
        }

        /// <summary>
        /// convert string to list by separators
        /// </summary>
        /// <param name="str">the string you want to deal with</param>
        /// <param name="separators">the separator  char </param>
        /// <returns></returns>
        public static List<string> StringToListBySeparators(this string str, char separators)
        {
            string[] strs = str.Split(separators);
            List<string> liststr = new List<string>(strs);
            return liststr;
        }
    }