prevent的XmlTextReader从扩大实体 [英] Prevent XmlTextReader from expanding entities

问题描述

我想读一个XML文档不扩大实体，做一些操作它，并重新保存其与未展开的实体，因为他们最初。

在直接使用的XDocument，它加载失败，抛出一个异常，告诉我它未膨胀的实体：

 的XDocument DOC = XDocument.Load（文件）; //＆LT; ---异常
// ...做一些操作，以文档
doc.Save（文件2）;
 

  

例外：引用了未声明的实体'的entityName

然后我试图通过的XmlTextReader 到的XDocument 的构造函数，但 EntityHandling 属性没有不扩大：

 的XmlTextReader的XmlReader =新的XmlTextReader（文件））;
xmlReader.EntityHandling = EntityHandling.ExpandCharEntities;
的XDocument DOC = XDocument.Load（XmlReader的）;
 

另外，我还看了看XmlReader.Create功能，但MSDN说：通过创建方法来创建读者展开所有实体

如何创建一个不扩大实体，或与实体的XDocument一个的XmlReader没有展开？

解决方案

下面为我工作。关键是使用反射来设置一个内部属性的值<一href="http://referencesource.microsoft.com/#System.Xml/Xml/System/Xml/Core/XmlTextReaderImpl.cs#2ddfbe26b99e28a0"相对=nofollow> DisableUndeclaredEntityCheck 。

  XmlDocument的文档=新的XmlDocument（）;
XmlReaderSettings readerSettings =新XmlReaderSettings（）
{
    DtdProcessing = DtdProcessing.Ignore，
    IgnoreWhitespace = TRUE，
};
使用（XmlReader的读者= XmlReader.Create（inputPath，readerSettings））
{
    。的PropertyInfo的PropertyInfo = reader.GetType（）的getProperty（DisableUndeclaredEntityCheck，BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic可）;
    propertyInfo.SetValue（读者，真正的）;
    document.Load（读卡器）;
}
 

I am trying to read a XML document without expanding the entities, do some manipulations to it, and re-save it with the unexpanded entities as they were initially.

When using the XDocument directly, it fails to load, throwing an exception tell me it has unexpanded entities:

XDocument doc = XDocument.Load(file);  // <--- Exception
// ... do some manipulation to doc
doc.Save(file2);

Exception: Reference to undeclared entity 'entityname'.

Then I tried to pass the XmlTextReader to the XDocument constructor, but the EntityHandling property does not have "no expand":

XmlTextReader xmlReader = new XmlTextReader(file));
xmlReader.EntityHandling = EntityHandling.ExpandCharEntities;
XDocument doc = XDocument.Load(xmlReader);

Also, I have looked at the XmlReader.Create function, but MSDN says: "readers created by the Create method expand all entities".

How can I create a XmlReader that does not expand entities, or have a XDocument with entities not expanded?

解决方案

The following worked for me. The key is using reflection to set the value of an internal property DisableUndeclaredEntityCheck.

XmlDocument document = new XmlDocument();
XmlReaderSettings readerSettings = new XmlReaderSettings()
{
    DtdProcessing = DtdProcessing.Ignore,
    IgnoreWhitespace = true,
};
using (XmlReader reader = XmlReader.Create(inputPath, readerSettings))
{
    PropertyInfo propertyInfo = reader.GetType().GetProperty("DisableUndeclaredEntityCheck", BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
    propertyInfo.SetValue(reader, true);
    document.Load(reader);
}

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