如何使用 XSD 进行验证 (LINQ to XML)
System.Xml.Schema 命名空间包含扩展方法,这些扩展方法可以简化针对 XML 架构定义语言 (XSD) 文件验证 XML 树的过程。 有关更多信息,请参见 Validate 方法文档。
示例:针对 XmlSchemaSet 验证 XDocument 对象
下面的示例创建一个 XmlSchemaSet,然后针对架构集验证两个 XDocument 对象。 其中一个文档有效,另一个文档无效。
string xsdMarkup =
@"<xsd:schema xmlns:xsd='http://www.w3.org/2001/XMLSchema'>
<xsd:element name='Root'>
<xsd:complexType>
<xsd:sequence>
<xsd:element name='Child1' minOccurs='1' maxOccurs='1'/>
<xsd:element name='Child2' minOccurs='1' maxOccurs='1'/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>";
XmlSchemaSet schemas = new XmlSchemaSet();
schemas.Add("", XmlReader.Create(new StringReader(xsdMarkup)));
XDocument doc1 = new XDocument(
new XElement("Root",
new XElement("Child1", "content1"),
new XElement("Child2", "content1")
)
);
XDocument doc2 = new XDocument(
new XElement("Root",
new XElement("Child1", "content1"),
new XElement("Child3", "content1")
)
);
Console.WriteLine("Validating doc1");
bool errors = false;
doc1.Validate(schemas, (o, e) =>
{
Console.WriteLine("{0}", e.Message);
errors = true;
});
Console.WriteLine("doc1 {0}", errors ? "did not validate" : "validated");
Console.WriteLine();
Console.WriteLine("Validating doc2");
errors = false;
doc2.Validate(schemas, (o, e) =>
{
Console.WriteLine("{0}", e.Message);
errors = true;
});
Console.WriteLine("doc2 {0}", errors ? "did not validate" : "validated");
Dim errors As Boolean = False
Private Sub XSDErrors(ByVal o As Object, ByVal e As ValidationEventArgs)
Console.WriteLine("{0}", e.Message)
errors = True
End Sub
Sub Main()
Dim xsdMarkup As XElement = _
<xsd:schema xmlns:xsd='http://www.w3.org/2001/XMLSchema'>
<xsd:element name='Root'>
<xsd:complexType>
<xsd:sequence>
<xsd:element name='Child1' minOccurs='1' maxOccurs='1'/>
<xsd:element name='Child2' minOccurs='1' maxOccurs='1'/>
</xsd:sequence>
</xsd:complexType>
</xsd:element>
</xsd:schema>
Dim schemas As XmlSchemaSet = New XmlSchemaSet()
schemas.Add("", xsdMarkup.CreateReader)
Dim doc1 As XDocument = _
<?xml version='1.0'?>
<Root>
<Child1>content1</Child1>
<Child2>content1</Child2>
</Root>
Dim doc2 As XDocument = _
<?xml version='1.0'?>
<Root>
<Child1>content1</Child1>
<Child3>content1</Child3>
</Root>
Console.WriteLine("Validating doc1")
errors = False
doc1.Validate(schemas, AddressOf XSDErrors)
Console.WriteLine("doc1 {0}", IIf(errors = True, "did not validate", "validated"))
Console.WriteLine()
Console.WriteLine("Validating doc2")
errors = False
doc2.Validate(schemas, AddressOf XSDErrors)
Console.WriteLine("doc2 {0}", IIf(errors = True, "did not validate", "validated"))
End Sub
该示例产生下面的输出:
Validating doc1
doc1 validated
Validating doc2
The element 'Root' has invalid child element 'Child3'. List of possible elements expected: 'Child2'.
doc2 did not validate
示例:针对文件中的架构从文件验证 XML 文档
下面的示例按照示例 XSD 文件:客户和订单中的架构验证示例 XML 文件:客户和订单中的 XML 文档是否有效。 然后修改源 XML 文档。 它更改第一个客户的 CustomerID
属性。 更改后,订单将引用一个不存在的客户,因此 XML 文档将不再有效。
XmlSchemaSet schemas = new XmlSchemaSet();
schemas.Add("", "CustomersOrders.xsd");
Console.WriteLine("Attempting to validate");
XDocument custOrdDoc = XDocument.Load("CustomersOrders.xml");
bool errors = false;
custOrdDoc.Validate(schemas, (o, e) =>
{
Console.WriteLine("{0}", e.Message);
errors = true;
});
Console.WriteLine("custOrdDoc {0}", errors ? "did not validate" : "validated");
Console.WriteLine();
// Modify the source document so that it won't validate.
custOrdDoc.Root.Element("Orders").Element("Order").Element("CustomerID").Value = "AAAAA";
Console.WriteLine("Attempting to validate after modification");
errors = false;
custOrdDoc.Validate(schemas, (o, e) =>
{
Console.WriteLine("{0}", e.Message);
errors = true;
});
Console.WriteLine("custOrdDoc {0}", errors ? "did not validate" : "validated");
Dim errors As Boolean = False
Private Sub XSDErrors(ByVal o As Object, ByVal e As ValidationEventArgs)
Console.WriteLine("{0}", e.Message)
errors = True
End Sub
Sub Main()
Dim schemas As XmlSchemaSet = New XmlSchemaSet()
schemas.Add("", "CustomersOrders.xsd")
Console.WriteLine("Attempting to validate")
Dim custOrdDoc As XDocument = XDocument.Load("CustomersOrders.xml")
errors = False
custOrdDoc.Validate(schemas, AddressOf XSDErrors)
Console.WriteLine("custOrdDoc {0}", IIf(errors, "did not validate", "validated"))
Console.WriteLine()
' Modify the source document so that it won't validate.
custOrdDoc.<Root>.<Orders>.<Order>.<CustomerID>(0).Value = "AAAAA"
Console.WriteLine("Attempting to validate after modification")
errors = False
custOrdDoc.Validate(schemas, AddressOf XSDErrors)
Console.WriteLine("custOrdDoc {0}", IIf(errors, "did not validate", "validated"))
End Sub
该示例产生下面的输出:
Attempting to validate
custOrdDoc validated
Attempting to validate after modification
The key sequence 'AAAAA' in Keyref fails to refer to some key.
custOrdDoc did not validate