C# 字符串分割

public string[] StringSplit(string strSource, string strSplit)
        {
            string[] strtmp = new string[1]; int index = strSource.IndexOf(strSplit, 0);
            if (index < 0) { strtmp[0] = strSource; return strtmp; }
            else
            {
                strtmp[0] = strSource.Substring(0, index);
                return StringSplit(strSource.Substring(index + strSplit.Length), strSplit, strtmp);
            }
        }

        private string[] StringSplit(string strSource, string strSplit, string[] attachArray)
        {
            string[] strtmp = new string[attachArray.Length + 1]; attachArray.CopyTo(strtmp, 0);
            int index = strSource.IndexOf(strSplit, 0);
            if (index < 0)
            {
                strtmp[attachArray.Length] = strSource;
                return strtmp;
            }
            else
            {
                strtmp[attachArray.Length] = strSource.Substring(0, index);
                return StringSplit(strSource.Substring(index + strSplit.Length), strSplit, strtmp);
            }
        }