1  #region 去掉表情符号
  2         /// <summary>
  3         /// 去掉表情符号
  4         /// </summary>
  5         /// <param name="codePoint"></param>
  6         /// <returns></returns>
  7         public static bool isEmojiCharacter(char codePoint)
  8         {
  9             return (codePoint >= 0x2600 && codePoint <= 0x27BF) // 杂项符号与符号字体
 10                    || codePoint == 0x303D
 11                    || codePoint == 0x2049
 12                    || codePoint == 0x203C
 13                    || (codePoint >= 0x2000 && codePoint <= 0x200F) //
 14                    || (codePoint >= 0x2028 && codePoint <= 0x202F) //
 15                    || codePoint == 0x205F //
 16                    || (codePoint >= 0x2065 && codePoint <= 0x206F) //
 17                                                                    /* 标点符号占用区域 */
 18                    || (codePoint >= 0x2100 && codePoint <= 0x214F) // 字母符号
 19                    || (codePoint >= 0x2300 && codePoint <= 0x23FF) // 各种技术符号
 20                    || (codePoint >= 0x2B00 && codePoint <= 0x2BFF) // 箭头A
 21                    || (codePoint >= 0x2900 && codePoint <= 0x297F) // 箭头B
 22                    || (codePoint >= 0x3200 && codePoint <= 0x32FF) // 中文符号
 23                    || (codePoint >= 0xD800 && codePoint <= 0xDFFF) // 高低位替代符保留区域
 24                    || (codePoint >= 0xE000 && codePoint <= 0xF8FF) // 私有保留区域
 25                    || (codePoint >= 0xFE00 && codePoint <= 0xFE0F) // 变异选择器
 26                                                                    //   || (codePoint >= U + 2600 && codePoint <= 0xFE0F)
 27                    || codePoint >= 0x10000; // Plane在第二平面以上的，char都不可以存，全部都转
 28 
 29         }
 30         /// <summary>
 31         /// 检测是否有emoji字符
 32         /// </summary>
 33         /// <param name="source"></param>
 34         /// <returns></returns>
 35         public static bool containsEmoji(String source)
 36         {
 37             if (string.IsNullOrEmpty(source))
 38             {
 39                 return false;
 40             }
 41 
 42             int len = source.Length;
 43 
 44             for (int i = 0; i < len; i++)
 45             {
 46                 char codePoint = source[i];
 47 
 48                 if (isEmojiCharacter(codePoint))
 49                 {
 50                     //do nothing，判断到了这里表明，确认有表情字符
 51                     return true;
 52                 }
 53             }
 54 
 55             return false;
 56         }
 57         /// <summary>
 58         /// 过滤emoji 或者 其他非文字类型的字符
 59         /// </summary>
 60         /// <param name="source">param source</param>
 61         /// <returns></returns>
 62         public static String filterEmoji(String source)
 63         {
 64            if(string.IsNullOrWhiteSpace(source))
 65            {
 66                return "";
 67            }
 68             source = source.Replace("[^\\u0000-\\uFFFF]", "").Replace("??", "");
 69             if (!containsEmoji(source))
 70             {
 71                 return source; //如果不包含，直接返回
 72             }
 73             //到这里铁定包含
 74             StringBuilder buf = null;
 75 
 76             int len = source.Length;
 77 
 78             for (int i = 0; i < len; i++)
 79             {
 80                 char codePoint = source[i];
 81 
 82                 if (!isEmojiCharacter(codePoint))
 83                 {
 84                     if (buf == null)
 85                     {
 86                         buf = new StringBuilder(source.Length);
 87                     }
 88 
 89                     buf.Append(codePoint);
 90                 }
 91                 else
 92                 {
 93                 }
 94             }
 95 
 96             if (buf == null)
 97             {
 98                 return source; //如果没有找到 emoji表情，则返回源字符串
 99             }
100             else
101             {
102                 if (buf.Length == len)
103                 {
104                     //这里的意义在于尽可能少的toString，因为会重新生成字符串
105                     buf = null;
106                     return source;
107                 }
108                 else
109                 {
110                     return buf.ToString();
111                 }
112             }
113 
114         }
115         #endregion