在C＃中转义无效的XML字符

Question

我有一个包含无效XML字符的字符串。在解析字符串之前，如何转义（或删除）无效的XML字符？

Answer 1

这是上述方法RemoveInvalidXmlChars的优化版本，该方法不会在每次调用时都创建一个新数组，因此不必要地给GC施加了压力：public static string RemoveInvalidXmlChars(string text){&nbsp; &nbsp; if (text == null)&nbsp; &nbsp; &nbsp; &nbsp; return text;&nbsp; &nbsp; if (text.Length == 0)&nbsp; &nbsp; &nbsp; &nbsp; return text;&nbsp; &nbsp; // a bit complicated, but avoids memory usage if not necessary&nbsp; &nbsp; StringBuilder result = null;&nbsp; &nbsp; for (int i = 0; i < text.Length; i++)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; var ch = text[i];&nbsp; &nbsp; &nbsp; &nbsp; if (XmlConvert.IsXmlChar(ch))&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result?.Append(ch);&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; else if (result == null)&nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result = new StringBuilder();&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; result.Append(text.Substring(0, i));&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; &nbsp; if (result == null)&nbsp; &nbsp; &nbsp; &nbsp; return text; // no invalid xml chars detected - return original text&nbsp; &nbsp; else&nbsp; &nbsp; &nbsp; &nbsp; return result.ToString();}