2

如何解析 XHTML 文档中的所有实体引用并将其转换为 IE 可以理解的纯 XHTML 文档?示例 XHTML:

<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html [
    <!ENTITY D "&#x2014;">
    <!ENTITY o "&#x2018;">
    <!ENTITY c "&#x2019;">
    <!ENTITY O "&#x201C;">
    <!ENTITY C "&#x201D;">
]>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    </head>
    <body>
        &O; &C;
    </body>
</html>
4

2 回答 2

2

原来这是 XmlTextReader(和 XmlValidatingReader)类中的简单选项 - “EntityHandling”。

所以一个简单的问题演示:

System.Xml.XmlTextReader textReader = new System.Xml.XmlTextReader("testin.xml");
textReader.EntityHandling = System.Xml.EntityHandling.ExpandEntities;
System.Xml.XmlDocument outputDoc = new System.Xml.XmlDocument();
outputDoc.Load(textReader);
System.Xml.XmlDocumentType docTypeIfPresent = outputDoc.DocumentType;
if (docTypeIfPresent != null)
    outputDoc.RemoveChild(docTypeIfPresent);
outputDoc.Save("testout.html");
textReader.Close();

如果您不想将文档加载到内存中,则可以使用流式等效项:

System.Xml.XmlTextReader textReader = new System.Xml.XmlTextReader("testin.xml");
textReader.EntityHandling = System.Xml.EntityHandling.ExpandEntities;
System.Xml.XmlTextWriter textWriter = new System.Xml.XmlTextWriter("testout.html", System.Text.Encoding.UTF8);
while (textReader.Read())
{
    if (textReader.NodeType != System.Xml.XmlNodeType.DocumentType)
        textWriter.WriteNode(textReader, false);
    else
        textReader.Skip();
}
textWriter.Close();
于 2009-03-05T16:01:52.633 回答
0

xmllint可以做到这一点,而且由于 xmllint 是用 C 语言编写的并且是免费软件,因此将它的工作方式调整到您的 C# 程序可能相对容易。这是一个例子:

% cat foo.xhtml 
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html [
    <!ENTITY D "&#x2014;">
    <!ENTITY o "&#x2018;">
    <!ENTITY c "&#x2019;">
    <!ENTITY O "&#x201C;">
    <!ENTITY C "&#x201D;">
]>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    </head>
    <body>
        &O; &C;
    </body>
</html>

% xmllint --noent --dropdtd foo.xhtml
<?xml version="1.0" encoding="utf-8"?>
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    </head>
    <body>
        [Plain Unicode characters that I prefer to omit because I don't know how SO handles it]
    </body>
</html>
于 2009-03-06T08:26:42.343 回答