[英]XML namespace missing for parser
我必須解析缺少xmlns:xsi =“ http://www.w3.org/2001/XMLSchema-instance”名稱空間的XML,因此xml看起來像這樣:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<program>
<scriptList>
<script type="StartScript">
<isUserScript>false</isUserScript>
</script>
</scriptList>
</program>
但應如下所示:
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<program xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
<scriptList>
<script xsi:type="StartScript">
<isUserScript>false</isUserScript>
</script>
</scriptList>
</program>
type屬性確保正確的子類,例如
class StartScript : script
{...}
解析器是通過$> xsd.exe a.xsd / classes(.Net)從手寫的xsd自動生成的。 這是xsd:
<?xml version="1.0" encoding="UTF-8"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
elementFormDefault="qualified" attributeFormDefault="qualified">
<!-- Main element -->
<xs:element name="program">
<xs:complexType>
<xs:sequence>
<xs:element name="scriptList">
<xs:complexType>
<xs:sequence>
<xs:element name="script" type="script" maxOccurs="unbounded"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
<xs:complexType name="script" />
<xs:complexType name="StartScript">
<xs:complexContent>
<xs:extension base="script">
<xs:all>
<xs:element name="isUserScript" type="xs:boolean"></xs:element>
</xs:all>
</xs:extension>
</xs:complexContent>
</xs:complexType>
一個簡單的解決方案是在輸入XML上運行字符串替換(“ type = \\”“到” xsi:type = \\“”),但這很丑陋。 有更好的解決方案嗎?
您可以將XML加載到XML XDocument
的中間LINQ中 ,修復<script>
元素上的屬性名稱空間,然后直接反序列化為最終類:
// Load to intermediate XDocument
XDocument xDoc;
using (var reader = XmlReader.Create(f))
xDoc = XDocument.Load(reader);
// Fix namespace of "type" attributes
XNamespace xsi = "http://www.w3.org/2001/XMLSchema-instance";
foreach (var element in xDoc.Descendants("script"))
{
var attr = element.Attribute("type");
if (attr == null)
continue;
var newAttr = new XAttribute(xsi + attr.Name.LocalName, attr.Value);
attr.Remove();
element.Add(newAttr);
}
// Deserialize directly to final class.
var program = xDoc.Deserialize<program>();
使用擴展方法:
public static class XObjectExtensions
{
public static T Deserialize<T>(this XContainer element, XmlSerializer serializer = null)
{
if (element == null)
throw new ArgumentNullException();
using (var reader = element.CreateReader())
return (T)(serializer ?? new XmlSerializer(typeof(T))).Deserialize(reader);
}
}
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