在将字符串加载到XML文档对象之前删除所有十六进制字符？

I have an xml string that is being posted to an ashx handler on the server. The xml string is built on the client-side and is based on a few different entries made on a form. Occasionally some users will copy and paste from other sources into the web form. When I try to load the xml string into an XMLDocument object using xmldoc.LoadXml(xmlStr) I get the following exception:

我有一个xml字符串，它被发布到服务器上的ashx处理程序。 xml字符串构建在客户端，基于表单上的几个不同条目。有时，某些用户会从其他来源复制并粘贴到Web表单中。当我尝试使用xmldoc.LoadXml（xmlStr）将xml字符串加载到XMLDocument对象时，我得到以下异常：

System.Xml.XmlException = {"'', hexadecimal value 0x0B, is an invalid character. Line 2, position 1."}

In debug mode I can see the rogue character (sorry I'm not sure of it's official title?):

在调试模式中，我可以看到流氓角色（抱歉，我不确定它的官方标题？）：

My questions is how can I sanitise the xml string before I attempt to load it into the XMLDocument object? Do I need a custom function to parse out all these sorts of characters one-by-one or can I use some native .NET4 class to remove them?

我的问题是，在尝试将xml字符串加载到XMLDocument对象之前，如何清理xml字符串？我是否需要一个自定义函数来逐个解析所有这些类型的字符，还是可以使用一些本机.NET4类来删除它们？

2 个解决方案

#1

Here you have an example to clean xml invalid characters using Regex:

这里有一个使用Regex清除xml无效字符的示例：

 xmlString = CleanInvalidXmlChars(xmlString);
 XmlDocument xmlDoc = new XmlDocument();
 xmlDoc.LoadXml(xmlString);

 public static string CleanInvalidXmlChars(string text)   
 {   
   string re = @"[^\x09\x0A\x0D\x20-\xD7FF\xE000-\xFFFD\x10000-x10FFFF]";   
   return Regex.Replace(text, re, "");   
 }   

#2

A more efficient way to not error out on invalid XML characters would be to use the CheckCharacters flag in XmlReaderSettings.

不对错误的XML字符进行错误输出的更有效方法是在XmlReaderSettings中使用CheckCharacters标志。

var xmlDoc = new XmlDocument();
var xmlReaderSettings = new XmlReaderSettings { CheckCharacters = false };
using (var stringReader = new StringReader(xml)) {
    using (var xmlReader = XmlReader.Create(stringReader, xmlReaderSettings)) {
        xmlDoc.Load(xmlReader);
    }
}