using System.Text.RegularExpressions;using System.Text;/// 
/// 字符串长度(按字节算)/// 
/// /// 
     static int StrLength(string str){    int len = 0;    byte[] b;    for (int i = 0; i < str.Length; i++)    {        b = Encoding.Default.GetBytes(str.Substring(i,1));        if (b.Length > 1)            len += 2;        else            len++;    }    return len;}/// 
/// 截取指定长度字符串(按字节算)/// 
/// /// /// 
     static string StrCut(string str, int length){    int len = 0;    byte[] b;    StringBuilder sb = new StringBuilder();    for (int i = 0; i < str.Length; i++)    {        b = Encoding.Default.GetBytes(str.Substring(i, 1));        if (b.Length > 1)            len += 2;        else            len++;        if (len >= length)            break;        sb.Append(str[i]);    }    return sb.ToString();}