在构造使用该数据的XmlReader或XPathDocument之前，如何从基于XML的数据源中删除无效的十六进制字符？

这 可能并不完美 （由于人们错过了此免责声明，因此添加了重点），但是在此情况下，我的工作如下。您可以调整以与流一起使用。

/// <summary>/// Removes control characters and other non-UTF-8 characters/// </summary>/// <param name="inString">The string to process</param>/// <returns>A string with no control characters or entities above 0x00FD</returns>public static string RemoveTroublesomeCharacters(string inString){    if (inString == null) return null;    StringBuilder newString = new StringBuilder();    char ch;    for (int i = 0; i < inString.Length; i++)    {        ch = inString[i];        // remove any characters outside the valid UTF-8 range as well as all control characters        // except tabs and new lines        //if ((ch < 0x00FD && ch > 0x001F) || ch == 't' || ch == 'n' || ch == 'r')        //if using .NET version prior to 4, use above logic        if (XmlConvert.IsXmlChar(ch)) //this method is new in .NET 4        { newString.Append(ch);        }    }    return newString.ToString();}