public partial class SubString : System.Web.UI.Page

    {         protected void Page_Load(object sender, EventArgs e)         {             this.lblSub.Text = GetFirstString("中国人chinese", 7);             this.lblSub2.Text = GetFirstString("afafaf你好", 7);         }            public  string getStr(string strInput, int intLen)         {             strInput = strInput.Trim();             byte[] myByte = System.Text.Encoding.Default.GetBytes(strInput);             Response.Write("getStr Function is::"+myByte.Length.ToString());             if (myByte.Length > intLen)             {                 //截取操作                 string resultStr = "";                 for (int i = 0; i < strInput.Length; i++)                 {                     byte[] tempByte = System.Text.Encoding.Default.GetBytes(resultStr);                     if (tempByte.Length < intLen)                     {                         resultStr += strInput.Substring(i, 1);                     }                     else                     {                         break;                     }                 }                 return resultStr + "...";             }             else             {                 return strInput;             }         }

        public  string cutString(string strInput, int intLen)

        {             strInput = strInput.Trim();             byte[] myByte = System.Text.Encoding.Default.GetBytes(strInput);             Response.Write("cutString Function is::" + myByte.Length.ToString());             if (myByte.Length > intLen)             {                 //截取操作                 string resultStr = "";                 for (int i = 0; i < strInput.Length; i++)                 {                     byte[] tempByte = System.Text.Encoding.Default.GetBytes(resultStr);                     if (tempByte.Length < intLen)                     {                                                 resultStr += strInput.Substring(i, 1);                     }                     else                     {                         break;                     }                 }                 return resultStr + "...";             }             else             {                 return strInput;             }         }

        public static string Fix(string s, int len)

        {             string result = ""; //最终返回的结果             int byteLen = System.Text.Encoding.Default.GetByteCount(s);  //单字节字符长度             int charLen = s.Length; //把字符平等对待时的字符串长度             int byteCount = 0;  //记录读取进度{中文按两单位计算}             int pos = 0;    //记录截取位置{中文按两单位计算}             if (byteLen > len)             {                 for (int i = 0; i < charLen; i++)                 {                     if (Convert.ToInt32(s.ToCharArray()[i]) > 255)  //遇中文字符计数加2                         byteCount += 2;                     else         //按英文字符计算加1                         byteCount += 1;                     if (byteCount >= len)   //到达指定长度时，记录指针位置并停止                     {                         pos = i;                         break;                     }                 }                 result = s.Substring(0, pos)+"...";             }             else                 result = s;

            return result;

        }

        #region  截短字串的函数，分区中英文

        /// <summary>         /// 截短字串的函数         /// </summary>         /// <param name="mText">要加工的字串</param>         /// <param name="byteCount">长度</param>         /// <returns>被加工过的字串</returns>         public string Left(string mText, int byteCount)         {             if (byteCount < 1) return mText;

            if (System.Text.Encoding.Default.GetByteCount(mText) <= byteCount)

            {                 return mText;             }             else             {                 byte[] txtBytes = System.Text.Encoding.Default.GetBytes(mText);                 byte[] newBytes = new byte[byteCount - 4];

                for (int i = 0; i < byteCount - 4; i++)

                {                     newBytes[i] = txtBytes[i];                 }

                return System.Text.Encoding.Default.GetString(newBytes) + "...";

            }         }         #endregion

        public static string GetFirstString(string stringToSub, int length)

        {             Regex regex = new Regex("[\u4e00-\u9fa5]+", RegexOptions.Compiled);             char[] stringChar = stringToSub.ToCharArray();             StringBuilder sb = new StringBuilder();             int nLength = 0;             bool isCut = false;             for (int i = 0; i < stringChar.Length; i++)             {                 if (regex.IsMatch((stringChar[i]).ToString()))                 {                     sb.Append(stringChar[i]);                     nLength += 2;                 }                 else                 {                     sb.Append(stringChar[i]);                     nLength = nLength + 1;                 }

                if (nLength > length)

                {                     isCut = true;                     break;                 }             }             if (isCut)                 return sb.ToString() + "...";             else                 return sb.ToString();         }     } 

 

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