把短信内容按照字节拆分条数

按字节长度拆分内容
//计算发送信息的次数（条数，按140字节）
int iContentCount = (int)Math.Ceiling((double)ASCIIEncoding.Default.GetByteCount(SMContent)/140F); 


string[] strMessage = new string[iContentCount]; //数组
                int iNum = 0;    //计数器
                while(iContentCount > 0)
                {
                    strMessage[iNum] = GetStringPartContent(SMContent,140);
                    SMContent = SMContent.Substring(strMessage[iNum].Length);
                    iNum++;
                    iContentCount --;
                }



        /**//// <summary>
        /// 功能描述：判断字节数
        /// </summary>        
        private string GetStringPartContent(string cOriginalityString, int iLenReturnString)
        {
            string cReturnString = cOriginalityString;        //返回的字符串的内容。

            if (cReturnString.Length > iLenReturnString)
            {
                cReturnString = cReturnString.Substring(0, iLenReturnString);
            }

            int ilength = iLenReturnString;        //此方法不区分汉字，一个汉字只算1
            if (cReturnString.Length < iLenReturnString)
            {
                ilength = cReturnString.Length;
            }

            while(true)
            {
                int ilent = System.Text.ASCIIEncoding.Default.GetByteCount(cReturnString);    //此方法区分汉字，一个汉字算2
                if (ilent > iLenReturnString)
                {
                    ilength --;
                    cReturnString = cReturnString.Substring(0, ilength);
                }
                else
                {
                    break;
                }
            }
        

            return cReturnString;
        }