Kiểm tra tài liệu XML ThS. Trần Minh Triết

XmlValidatingReader Lớp đối tượng XmlValidatingReader: Ví dụ: public XmlValidatingReader(XmlReader); public XmlValidatingReader(Stream, XmlNodeType, XmlParserContext); public XmlValidatingReader(string, XmlNodeType, XmlParserContext); Ví dụ: XmlTextReader _coreReader = new XmlTextReader (fileName); XmlValidatingReader reader=new XmlValidatingReader (_coreReader);

Kiểm tra toàn bộ tài liệu XML private bool ValidateDocument (string fileName) { // Initialize the validating reader XmlTextReader _coreReader = new XmlTextReader(fileName); XmlValidatingReader reader = new XmlValidatingReader(_coreReader); // Prepare for validation reader.ValidationType = ValidationType.Auto; reader.ValidationEventHandler += new ValidationEventHandler(MyHandler); // Parse and validate all the nodes in the document while (reader.Read()) {} // Close the reader reader.Close(); return true; }

Kiểm tra toàn bộ tài liệu XML (tt) private void MyHandler ( object sender, ValidationEventArgs e) { // Logs the error that occurred PrintOut(e.Exception.GetType().Name, e.Message); }

Các loại kiểm tra Validation Type None Auto DTD Schema XDR

Phân tích cách xác định loại kiểm tra phù hợp string GetActualValidationType (XmlValidatingReader reader, string filename) { string realValidationType = ""; if (reader.ValidationType == ValidationType.Auto) { if (reader.NodeType == XmlNodeType.DocumentType) realValidationType = "Auto.DTD"; else { if(reader.SchemaType is XmlSchemaType) { XmlSchemaType xst = (XmlSchemaType) reader.SchemaType; string xsd = Path.GetFileName(xst.SourceUri); string doc = Path.GetFileName(filename); if (xsd == doc) realValidationType = "Auto.Schema.Inline"; realValidationType = "Auto.Schema.Ref ("+ xsd + ")"; } return realValidationType;

Quy trình kiểm tra

Kiểm tra một đoạn XML public XmlValidatingReader (Stream, XmlNodeType, XmlParserContext); (string, XmlNodeType, XmlParserContext);

Giới thiệu về DTD <?xml version="1.0" ?> <!DOCTYPE class SYSTEM "class.dtd"> <!-- Sample XML document (data_dtd.xml) using a DTD --> <class title="Applied XML Programming for .NET" company="DinoEsposito's Own Company" author="Dino Esposito"> <days total="5" expandable="true"> <day id="1">XML Core Classes</day> <day id="2">Related Technologies</day> <day id="3">XML and ADO.NET</day> <day id="4" optional="true">XML and Applications</day> <day id="5" optional="true">XML Interoperability</day> </days> </class>

Giới thiệu về DTD <!ELEMENT class (days)> <!ATTLIST class title CDATA #REQUIRED author CDATA #IMPLIED company CDATA #IMPLIED> <!ENTITY % Boolean "true | false"> <!ELEMENT days (day*)> <!ATTLIST days total CDATA #REQUIRED expandable (%Boolean;) #REQUIRED> <!ELEMENT day (#PCDATA)> <!ATTLIST day id CDATA #REQUIRED optional (%Boolean;) #IMPLIED>

Kiểm tra với DTD XmlTextReader _coreReader = new XmlTextReader("data_dtd.xml"); XmlValidatingReader reader = new XmlValidatingReader(_coreReader); reader.ValidationType = ValidationType.DTD; reader.ValidationEventHandler += new ValidationEventHandler(MyHandler); while (reader.Read()); --------------------------------------------------- private void MyHandler(object sender, ValidationEventArgs e) { if (e.Severity == XmlSeverityType.Error) { // Handle the schema exception }

Giới thiệu về XDR <?xml version="1.0" ?> <!-- Sample XML document (data_xdr.xml) using XDR --> <class xmlns="x-schema:Schema.xml" title="Applied XML Programming for .NET" company="Wintellect" author="DinoE"> <days total="5" expandable="true"> <day id="1">XML Core Classes</day> <day id="2">Related Technologies</day> <day id="3">XML and ADO.NET</day> <day id="4" optional="true">XML and Applications</day> <day id="5" optional="true">XML Interoperability</day> </days> </class>

Giới thiệu về XDR <?xml version="1.0"?> <Schema name="MyClass" xmlns="urn:schemas-microsoft-com:xml-data" xmlns:dt="urn:schemas-microsoft-com:datatypes"> <!-- Attribute Types --> <AttributeType name="title" dt:type="string" /> <AttributeType name="company" dt:type="string" /> <AttributeType name="author" dt:type="string" /> <AttributeType name="total" dt:type="int" /> <AttributeType name="expandable" dt:type="enumeration" dt:values="true false" /> <AttributeType name="optional" dt:type="enumeration" <AttributeType name="id" dt:type="int" />

Giới thiệu về XDR <!-- Element Types --> <!-- CLASS --> <ElementType name="class" content="eltOnly" model="closed" order="seq"> <element type="days" minOccurs="1" maxOccurs="1" /> <attribute type="title" required="yes" /> <attribute type="author" required="no" /> <attribute type="company" required="no" /> </ElementType>

Giới thiệu về XDR <!-- DAYS --> <ElementType name="days" content="eltOnly"> <element type="day" minOccurs="1" maxOccurs="*" /> <attribute type="total" required="yes" /> <attribute type="expandable" required="no" /> </ElementType> <!-- DAY --> <ElementType name="day" content="textOnly"> <attribute type="id" required="yes" /> <attribute type="optional" required="no" /> </Schema>

Kiểm tra với XDR XmlTextReader _coreReader = new XmlTextReader("data_xdr.xml"); XmlValidatingReader reader = new XmlValidatingReader(_coreReader); reader.ValidationType = ValidationType.XDR; reader.ValidationEventHandler += new ValidationEventHandler(MyHandler); while (reader.Read()); --------------------------------------------------- private void MyHandler(object sender, ValidationEventArgs e) { if (e.Severity == XmlSeverityType.Error) { // Handle the schema exception }

Giới thiệu về Schema <?xml version="1.0"?> <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"> <xs:element name="address" type="AddressType" /> <xs:complexType name="AddressType"> <xs:sequence> <xs:element name="street" type="xs:string" /> <xs:element name="number" type="xs:string" /> <xs:element name="city" type="xs:string" /> <xs:element name="state" type="xs:string" /> <xs:element name="zip" type="xs:string" /> </xs:sequence> <xs:attribute name="country" type="xs:string" /> </xs:complexType> </xs:schema>

Kiểm tra với Schema XmlTextReader _coreReader = new XmlTextReader("data_xdr.xml"); XmlValidatingReader reader = new XmlValidatingReader(_coreReader); reader.ValidationType = ValidationType.Schema; reader.ValidationEventHandler += new ValidationEventHandler(MyHandler); while (reader.Read()); --------------------------------------------------- private void MyHandler(object sender, ValidationEventArgs e) { if (e.Severity == XmlSeverityType.Error) { // Handle the schema exception }