汉字按字节进行计算，并进行分解，用于短信机发送

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        protected bool IsChineseLetter(string input, int index)
        {
            int code = 0;
            int chfrom = Convert.ToInt32("4e00", 16);    //范围（0x4e00～0x9fff）转换成int（chfrom～chend）
            int chend = Convert.ToInt32("9fff", 16);
            if (input != "")
            {
                code = Char.ConvertToUtf32(input, index);    //获得字符串input中指定索引index处字符unicode编码

                if (code >= chfrom && code <= chend)
                {
                    return true;     //当code在中文范围内返回true

                }
                else
                {
                    return false;    //当code不在中文范围内返回false
                }
            }
            return false;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            string ls_s = "1234567890一二三四五六七八九十一1二2三3四4五5六6七7八8九9零0零0";
            int li_count= 0;
            int li_list = 0;
            int li_li = 1;
            int li_page = 0;

            for (int i = 0; i < ls_s.Length; i++)
            {
                if (IsChineseLetter(ls_s, i))
                {
                    li_count += 2;
                }
                else
                {
                    li_count += 1;
                }
            }

            li_page = li_count / 10;
            if (li_count % 10 > 0)
            {
                li_page++;
            }
            li_count = 0;
            for (int i = 0; i < ls_s.Length; i++)
            {
                if (IsChineseLetter(ls_s, i))
                {
                    li_count += 2;
                }
                else
                {
                    li_count += 1;
                }

                if (li_count >= li_li * 10)
                {
                    MessageBox.Show(ls_s.Substring(li_list, i - li_list + 1), li_li.ToString()+"/"+li_page.ToString());
                    li_list = i + 1;
                    li_li++;
                }
              
                   
            }

            MessageBox.Show(ls_s.Substring(li_list, ls_s.Length - li_list), li_li.ToString() + "/" + li_page.ToString());
            MessageBox.Show(li_count.ToString());
                      
        }
    }
}