/// <summary>/// 截取中英文混合字符串/// </summary>/// <param name="text">字符文本</param>/// <param name="length">截取長度</param>/// <param name="replacetxt">replacetxt替換的多余字符</param>/// <returns></returns>public string GetString(string text, int length, string replacetxt){ int strLength = 0; StringBuilder strb = new StringBuilder(); char[] Temp = text.ToCharArray(); for (int i = 0; i != Temp.Length; i++) {  if (strLength >= length) //  {   strb.Append(replacetxt);   break;  }  else  {   if (((int)Temp[i]) < 255) //大于255的都是漢字或者特殊字符   {    strLength++;   }   else   {    strLength = strLength + 2;   }   strb.Append(Temp[i]);  } } return strb.ToString();}