如何修复代理对 (0xD83D, 0x27) 无效

Question

我有一个字节数组，文本是xml和"Hei "。我做

var bodyText = Encoding.UTF8.GetString(transportMessage.Body);
var bodyXml = XElement.Parse(bodyText);

获取字符串将表情符号编码为 &# xD83D;&#x DE0A; 所以 XElement.Parse 抛出：

System.InvalidOperationException: There was an error generating the XML document. ---> System.ArgumentException: The surrogate pair (0xD83D, 0x27) is invalid. A high surrogate character (0xD800 - 0xDBFF) must always be paired with a low surrogate character (0xDC00 - 0xDFFF).

如何删除此表情符号（或任何其他表情符号）我尝试使用具有无效 xml 个字符的正则表达式 [^\x09\x0A\x0D\x20-\xD7FF\xE000-\xFFFD\x10000-x10FFFF] 但它与该表情符号不匹配。

Answer 1

我用这段代码删除了这个：

 private static readonly Regex EmojiRegex = new Regex("&#x?[A-Fa-f0-9]+;");
 private static string ReplaceInvalidXmlCharacterReferences(string input)
        {
            if (input.IndexOf("&#") == -1)
                return input;

            return EmojiRegex.Replace(input, match =>
            {
                string ncr = match.Value;
                uint num;
                var frmt = NumberFormatInfo.InvariantInfo;

                bool isParsed =
                    ncr[2] == 'x' ?   // the x must be lowercase in XML documents
                    uint.TryParse(ncr.Substring(3, ncr.Length - 4), NumberStyles.AllowHexSpecifier, frmt, out num) :
                    uint.TryParse(ncr.Substring(2, ncr.Length - 3), NumberStyles.Integer, frmt, out num);

                return isParsed && !XmlConvert.IsXmlChar((char)num) ? "" : ncr;
            });
        }

如何修复代理对 (0xD83D, 0x27) 无效

How to fix The surrogate pair (0xD83D, 0x27) is invalid

c#

xml

encoding

utf-8

emoji