最近遇到一个项目，客户手机上发送的表情要在电脑网页中显示，没有找到简便方法，于是有了以下方案。
由于Emoji表情传到后台是“口”，怎么找出接收数据中的表情是关键，各种搜索后，我用下面的正则表达式匹配到所有的Emoji表情，然后进行替换成图片。
匹配表情的正则表达式
Regex reg = new Regex("[\uD800-\uDBFF][\uDC00-\uDFFF]|[\u2600-\u27ff]");
参考资料
http://www.emoji-cheat-sheet.com/（官方网站）
http://apps.timwhitlock.info/emoji/tables/unicode#block-4-enclosed-characters
http://bbs.csdn.net/topics/390055415
https://github.com/xiongxin2oo8/emoji-cheat-sheet.com
http://code.iamcal.com/php/emoji/（PHP-emoji转换表）
emoji表情来自
http://www.emoji-cheat-sheet.com/（官方网站、名称为英文版、在线）
https://github.com/Ranks/emojify.js（名称为英文版 png）
https://punchdrunker.github.io/iOSEmoji/table_html/index.html（名称为utf16转10进制版）
emoji表情 json 对照文件来自
https://github.com/Ranks/emojify.js utf-16 name 对应 ios6（下文中Emoji_ios6）
https://github.com/github/gemoji 名称表情对应(下文中Emoji_g)
替换方式：
1、表情替换为图片 表情英文名称版
Regex reg = new Regex("[\uD800-\uDBFF][\uDC00-\uDFFF]|[\u2600-\u27ff]");
MatchCollection match = reg.Matches(test_data);
string emoji_path = Server.MapPath("/Content/others/emoji.json");
StreamReader read = new StreamReader(emoji_path, Encoding.UTF8);
string json = read.ReadToEnd();
List<Emoji_g> emoji_list = JsonConvert.DeserializeObject<List<Emoji_g>>(json);
//StringBuilder sr = new StringBuilder();
//for (int i = 0; i < content.Length; i++)
//{
// sr.Append("\\u");
// sr.Append(((int)content[i]).ToString("X"));
//}
string emoji_str = string.Empty;
string emoji_value = string.Empty;
foreach (Match item in match)
{
StringBuilder sresult = new StringBuilder();
for (int i = 0; i < item.Length; i++)
{
sresult.Append(((int)item.Value[i]).ToString("X"));
}
Emoji_g emoji = emoji_list.Where(e => e.unicode == sresult.ToString()).FirstOrDefault();
Emoji_g e_teste = emoji_list.Where(e=>e.aliases[0]=="china").FirstOrDefault();
if (emoji != null)
{
test_data = test_data.Replace(item.Value, "<img style=‘width:22px‘ src=‘http://www.emoji-cheat-sheet.com/graphics/emojis/" + emoji.aliases[0] + ".png‘ />");
emoji_str = string.Empty;
emoji_value = string.Empty;
}
else
{
emoji_str += sresult.ToString();
emoji_value += item.Value;
emoji = emoji_list.Where(e => e.unicode == emoji_str).FirstOrDefault();
if (emoji != null)
{
test_data = test_data.Replace(emoji_value, "<img style=‘width:22px‘ src=‘http://www.emoji-cheat-sheet.com/graphics/emojis/" + emoji.aliases[0] + ".png‘ />");
emoji_str = string.Empty;
emoji_value = string.Empty;
}
}
}
return Content(test_data);
2、表情名称为10进制数字版
Regex reg = new Regex("[\uD800-\uDBFF][\uDC00-\uDFFF]|[\u2600-\u27ff]");
MatchCollection match = reg.Matches(content);
string emoji_path = Server.MapPath("/Content/others/emoji_ios6.json");
StreamReader read = new StreamReader(emoji_path, Encoding.UTF8);
string json = read.ReadToEnd();
List<Emoji_ios6> emoji_list = JsonConvert.DeserializeObject<List<Emoji_ios6>>(json);
//StringBuilder sr = new StringBuilder();
//for (int i = 0; i < content.Length; i++)
//{
// sr.Append("\\u");
// sr.Append(((int)content[i]).ToString("X"));
//}
foreach (Match item in match)
{
StringBuilder sresult = new StringBuilder();
for (int i = 0; i < item.Length; i++)
{
sresult.Append(((int)item.Value[i]).ToString("X"));
}
Emoji_ios6 emoji = emoji_list.Where(e => e.utf16 == sresult.ToString()).FirstOrDefault();
if (emoji != null)
content = content.Replace(item.Value, "<img style=‘width:22px‘ src=‘/content/emoji/" + Convert.ToInt32(emoji.codepoint, 16) + ".png‘ />");
}
return content;