XmlSchemaValidator Classe

Definizione

public ref class XmlSchemaValidator sealed

public sealed class XmlSchemaValidator

type XmlSchemaValidator = class

Public NotInheritable Class XmlSchemaValidator

Ereditarietà

Object

XmlSchemaValidator

Esempio

Nell'esempio seguente il file viene contosoBooks.xml convalidato in base allo contosoBooks.xsd schema. Nell'esempio viene usata la classe XmlSerializer per deserializzare il file contosoBooks.xml e passare il valore dei nodi ai metodi della classe XmlSchemaValidator.

using System;
using System.Xml;
using System.Xml.Schema;
using System.Xml.Serialization;
using System.Collections;

namespace Microsoft.Samples.Xml.Schema
{
    class XmlSchemaValidatorExamples
    {
        static void Main()
        {
            // The XML document to deserialize into the XmlSerializer object.
            XmlReader reader = XmlReader.Create("contosoBooks.xml");

            // The XmlSerializer object.
            XmlSerializer serializer = new XmlSerializer(typeof(ContosoBooks));
            ContosoBooks books = (ContosoBooks)serializer.Deserialize(reader);

            // The XmlSchemaSet object containing the schema used to validate the XML document.
            XmlSchemaSet schemaSet = new XmlSchemaSet();
            schemaSet.Add("http://www.contoso.com/books", "contosoBooks.xsd");

            // The XmlNamespaceManager object used to handle namespaces.
            XmlNamespaceManager manager = new XmlNamespaceManager(reader.NameTable);

            // Assign a ValidationEventHandler to handle schema validation warnings and errors.
            XmlSchemaValidator validator = new XmlSchemaValidator(reader.NameTable, schemaSet, manager, XmlSchemaValidationFlags.None);
            validator.ValidationEventHandler += new ValidationEventHandler(SchemaValidationEventHandler);

            // Initialize the XmlSchemaValidator object.
            validator.Initialize();

            // Validate the bookstore element, verify that all required attributes are present
            // and prepare to validate child content.
            validator.ValidateElement("bookstore", "http://www.contoso.com/books", null);
            validator.GetUnspecifiedDefaultAttributes(new ArrayList());
            validator.ValidateEndOfAttributes(null);

            // Get the next exptected element in the bookstore context.
            XmlSchemaParticle[] particles = validator.GetExpectedParticles();
            XmlSchemaElement nextElement = particles[0] as XmlSchemaElement;
            Console.WriteLine("Expected Element: '{0}'", nextElement.Name);

            foreach (BookType book in books.Book)
            {
                // Validate the book element.
                validator.ValidateElement("book", "http://www.contoso.com/books", null);

                // Get the exptected attributes for the book element.
                Console.Write("\nExpected attributes: ");
                XmlSchemaAttribute[] attributes = validator.GetExpectedAttributes();
                foreach (XmlSchemaAttribute attribute in attributes)
                {
                    Console.Write("'{0}' ", attribute.Name);
                }
                Console.WriteLine();

                // Validate the genre attribute and display its post schema validation information.
                if (book.Genre != null)
                {
                    validator.ValidateAttribute("genre", "", book.Genre, schemaInfo);
                }
                DisplaySchemaInfo();

                // Validate the publicationdate attribute and display its post schema validation information.
                if (book.PublicationDate != null)
                {
                    validator.ValidateAttribute("publicationdate", "", dateTimeGetter(book.PublicationDate), schemaInfo);
                }
                DisplaySchemaInfo();

                // Validate the ISBN attribute and display its post schema validation information.
                if (book.Isbn != null)
                {
                    validator.ValidateAttribute("ISBN", "", book.Isbn, schemaInfo);
                }
                DisplaySchemaInfo();

                // After validating all the attributes for the current element with ValidateAttribute method,
                // you must call GetUnspecifiedDefaultAttributes to validate the default attributes.
                validator.GetUnspecifiedDefaultAttributes(new ArrayList());

                // Verify that all required attributes of the book element are present
                // and prepare to validate child content.
                validator.ValidateEndOfAttributes(null);

                // Validate the title element and its content.
                validator.ValidateElement("title", "http://www.contoso.com/books", null);
                validator.ValidateEndElement(null, book.Title);

                // Validate the author element, verify that all required attributes are present
                // and prepare to validate child content.
                validator.ValidateElement("author", "http://www.contoso.com/books", null);
                validator.GetUnspecifiedDefaultAttributes(new ArrayList());
                validator.ValidateEndOfAttributes(null);

                if (book.Author.Name != null)
                {
                    // Validate the name element and its content.
                    validator.ValidateElement("name", "http://www.contoso.com/books", null);
                    validator.ValidateEndElement(null, book.Author.Name);
                }

                if (book.Author.FirstName != null)
                {
                    // Validate the first-name element and its content.
                    validator.ValidateElement("first-name", "http://www.contoso.com/books", null);
                    validator.ValidateEndElement(null, book.Author.FirstName);
                }

                if (book.Author.LastName != null)
                {
                    // Validate the last-name element and its content.
                    validator.ValidateElement("last-name", "http://www.contoso.com/books", null);
                    validator.ValidateEndElement(null, book.Author.LastName);
                }

                // Validate the content of the author element.
                validator.ValidateEndElement(null);

                // Validate the price element and its content.
                validator.ValidateElement("price", "http://www.contoso.com/books", null);
                validator.ValidateEndElement(null, book.Price);

                // Validate the content of the book element.
                validator.ValidateEndElement(null);
            }

            // Validate the content of the bookstore element.
            validator.ValidateEndElement(null);

            // Close the XmlReader object.
            reader.Close();
        }

        static XmlSchemaInfo schemaInfo = new XmlSchemaInfo();
        static object dateTimeGetterContent;

        static object dateTimeGetterHandle()
        {
            return dateTimeGetterContent;
        }

        static XmlValueGetter dateTimeGetter(DateTime dateTime)
        {
            dateTimeGetterContent = dateTime;
            return new XmlValueGetter(dateTimeGetterHandle);
        }

        static void DisplaySchemaInfo()
        {
            if (schemaInfo.SchemaElement != null)
            {
                Console.WriteLine("Element '{0}' with type '{1}' is '{2}'",
                    schemaInfo.SchemaElement.Name, schemaInfo.SchemaType, schemaInfo.Validity);
            }
            else if (schemaInfo.SchemaAttribute != null)
            {
                Console.WriteLine("Attribute '{0}' with type '{1}' is '{2}'",
                    schemaInfo.SchemaAttribute.Name, schemaInfo.SchemaType, schemaInfo.Validity);
            }
        }

        static void SchemaValidationEventHandler(object sender, ValidationEventArgs e)
        {
            switch (e.Severity)
            {
                case XmlSeverityType.Error:
                    Console.WriteLine("\nError: {0}", e.Message);
                    break;
                case XmlSeverityType.Warning:
                    Console.WriteLine("\nWarning: {0}", e.Message);
                    break;
            }
        }
    }

    [XmlRootAttribute("bookstore", Namespace = "http://www.contoso.com/books", IsNullable = false)]
    public class ContosoBooks
    {
        [XmlElementAttribute("book")]
        public BookType[] Book;
    }

    public class BookType
    {
        [XmlAttributeAttribute("genre")]
        public string Genre;

        [XmlAttributeAttribute("publicationdate", DataType = "date")]
        public DateTime PublicationDate;

        [XmlAttributeAttribute("ISBN")]
        public string Isbn;

        [XmlElementAttribute("title")]
        public string Title;

        [XmlElementAttribute("author")]
        public BookAuthor Author;

        [XmlElementAttribute("price")]
        public Decimal Price;
    }

    public class BookAuthor
    {
        [XmlElementAttribute("name")]
        public string Name;

        [XmlElementAttribute("first-name")]
        public string FirstName;

        [XmlElementAttribute("last-name")]
        public string LastName;
    }
}

Imports System.Xml
Imports System.Xml.Schema
Imports System.Xml.Serialization
Imports System.Collections


Namespace Microsoft.Samples.Xml.Schema

    Class XmlSchemaValidatorExamples

        Shared Sub Main()

            ' The XML document to deserialize into the XmlSerializer object.
            Dim reader As XmlReader = XmlReader.Create("contosoBooks.xml")

            ' The XmlSerializer object.
            Dim serializer As XmlSerializer = New XmlSerializer(GetType(ContosoBooks))
            Dim books As ContosoBooks = CType(serializer.Deserialize(reader), ContosoBooks)

            ' The XmlSchemaSet object containing the schema used to validate the XML document.
            Dim schemaSet As XmlSchemaSet = New XmlSchemaSet()
            schemaSet.Add("http://www.contoso.com/books", "contosoBooks.xsd")

            ' The XmlNamespaceManager object used to handle namespaces.
            Dim manager As XmlNamespaceManager = New XmlNamespaceManager(reader.NameTable)

            ' Assign a ValidationEventHandler to handle schema validation warnings and errors.
            Dim validator As XmlSchemaValidator = New XmlSchemaValidator(reader.NameTable, schemaSet, manager, XmlSchemaValidationFlags.None)
            'validator.ValidationEventHandler += New ValidationEventHandler(SchemaValidationEventHandler)
            AddHandler validator.ValidationEventHandler, AddressOf SchemaValidationEventHandler

            ' Initialize the XmlSchemaValidator object.
            validator.Initialize()

            ' Validate the bookstore element, verify that all required attributes are present
            ' and prepare to validate child content.
            validator.ValidateElement("bookstore", "http://www.contoso.com/books", Nothing)

            validator.GetUnspecifiedDefaultAttributes(New ArrayList())
            validator.ValidateEndOfAttributes(Nothing)

            ' Get the next exptected element in the bookstore context.
            Dim particles() As XmlSchemaParticle = validator.GetExpectedParticles()
            Dim nextElement As XmlSchemaElement = particles(0)
            Console.WriteLine("Expected Element: '{0}'", nextElement.Name)

            For Each book As BookType In books.book
                ' Validate the book element.
                validator.ValidateElement("book", "http://www.contoso.com/books", Nothing)

                ' Get the exptected attributes for the book element.
                Console.Write(vbCrLf & "Expected attributes: ")
                Dim attributes() As XmlSchemaAttribute = validator.GetExpectedAttributes()
                For Each attribute As XmlSchemaAttribute In attributes
                    Console.Write("'{0}' ", attribute.Name)
                Next
                Console.WriteLine()

                ' Validate the genre attribute and display its post schema validation information.
                If Not book.Genre Is Nothing Then
                    validator.ValidateAttribute("genre", "", book.Genre, schemaInfo)
                End If
                DisplaySchemaInfo()

                ' Validate the publicationdate attribute and display its post schema validation information.
                If Not book.PublicationDate = Nothing Then
                    validator.ValidateAttribute("publicationdate", "", dateTimeGetter(book.PublicationDate), schemaInfo)
                End If
                DisplaySchemaInfo()

                ' Validate the ISBN attribute and display its post schema validation information.
                If Not book.Isbn Is Nothing Then
                    validator.ValidateAttribute("ISBN", "", book.Isbn, schemaInfo)
                End If
                DisplaySchemaInfo()
    
                ' After validating all the attributes for the current element with ValidateAttribute method,
                ' you must call GetUnspecifiedDefaultAttributes to validate the default attributes.
                validator.GetUnspecifiedDefaultAttributes(New ArrayList())

                ' Verify that all required attributes of the book element are present
                ' and prepare to validate child content.
                validator.ValidateEndOfAttributes(Nothing)

                ' Validate the title element and its content.
                validator.ValidateElement("title", "http://www.contoso.com/books", Nothing)
                validator.ValidateEndElement(Nothing, book.Title)

                ' Validate the author element, verify that all required attributes are present
                ' and prepare to validate child content.
                validator.ValidateElement("author", "http://www.contoso.com/books", Nothing)

                validator.GetUnspecifiedDefaultAttributes(New ArrayList())
                validator.ValidateEndOfAttributes(Nothing)

                If Not book.Author.Name Is Nothing Then
                    ' Validate the name element and its content.
                    validator.ValidateElement("name", "http://www.contoso.com/books", Nothing)
                    validator.ValidateEndElement(Nothing, book.Author.Name)
                End If

                If Not book.Author.FirstName Is Nothing Then
                    ' Validate the first-name element and its content.
                    validator.ValidateElement("first-name", "http://www.contoso.com/books", Nothing)
                    validator.ValidateEndElement(Nothing, book.Author.FirstName)

                End If

                If Not book.Author.LastName Is Nothing Then
                    ' Validate the last-name element and its content.
                    validator.ValidateElement("last-name", "http://www.contoso.com/books", Nothing)
                    validator.ValidateEndElement(Nothing, book.Author.LastName)
                End If

                ' Validate the content of the author element.
                validator.ValidateEndElement(Nothing)

                ' Validate the price element and its content.
                validator.ValidateElement("price", "http://www.contoso.com/books", Nothing)
                validator.ValidateEndElement(Nothing, book.Price)

                ' Validate the content of the book element.
                validator.ValidateEndElement(Nothing)
            Next

            ' Validate the content of the bookstore element.
            validator.ValidateEndElement(Nothing)

            ' Close the XmlReader object.
            reader.Close()

        End Sub

        Shared schemaInfo As XmlSchemaInfo = New XmlSchemaInfo()
        Shared dateTimeGetterContent As Object

        Shared Function dateTimeGetterHandle() As Object

            Return dateTimeGetterContent

        End Function

        Shared Function dateTimeGetter(ByVal dateTime As DateTime) As XmlValueGetter

            dateTimeGetterContent = dateTime
            Return New XmlValueGetter(AddressOf dateTimeGetterHandle)

        End Function

        Shared Sub DisplaySchemaInfo()

            If Not schemaInfo.SchemaElement Is Nothing Then
                Console.WriteLine("Element '{0}' with type '{1}' is '{2}'", schemaInfo.SchemaElement.Name, schemaInfo.SchemaType, schemaInfo.Validity)
            ElseIf Not schemaInfo.SchemaAttribute Is Nothing Then
                Console.WriteLine("Attribute '{0}' with type '{1}' is '{2}'", schemaInfo.SchemaAttribute.Name, schemaInfo.SchemaType, schemaInfo.Validity)
            End If

        End Sub

        Shared Sub SchemaValidationEventHandler(ByVal sender As Object, ByVal e As ValidationEventArgs)

            Select Case e.Severity
                Case XmlSeverityType.Error
                    Console.WriteLine(vbCrLf & "Error: {0}", e.Message)
                    Exit Sub
                Case XmlSeverityType.Warning
                    Console.WriteLine(vbCrLf & "Warning: {0}", e.Message)
                    Exit Sub
            End Select

        End Sub

    End Class

    <XmlRootAttribute("bookstore", Namespace:="http://www.contoso.com/books", IsNullable:=False)> _
    Public Class ContosoBooks

        <XmlElementAttribute("book")> _
        Public book() As BookType

    End Class

    Public Class BookType

        <XmlAttributeAttribute("genre")> _
        Public Genre As String

        <XmlAttributeAttribute("publicationdate", DataType:="date")> _
        Public PublicationDate As DateTime

        <XmlAttributeAttribute("ISBN")> _
        Public Isbn As String

        <XmlElementAttribute("title")> _
        Public Title As String

        <XmlElementAttribute("author")> _
        Public Author As BookAuthor

        <XmlElementAttribute("price")> _
        Public Price As Decimal

    End Class

    Public Class BookAuthor

        <XmlElementAttribute("name")> _
        Public Name As String

        <XmlElementAttribute("first-name")> _
        Public FirstName As String

        <XmlElementAttribute("last-name")> _
        Public LastName As String

    End Class

End Namespace

Nell'esempio il file contosoBooks.xml viene considerato come input.

<?xml version="1.0" encoding="utf-8" ?>
<bookstore xmlns="http://www.contoso.com/books">
    <book genre="autobiography" publicationdate="1981-03-22" ISBN="1-861003-11-0">
        <title>The Autobiography of Benjamin Franklin</title>
        <author>
            <first-name>Benjamin</first-name>
            <last-name>Franklin</last-name>
        </author>
        <price>8.99</price>
    </book>
    <book genre="novel" publicationdate="1967-11-17" ISBN="0-201-63361-2">
        <title>The Confidence Man</title>
        <author>
            <first-name>Herman</first-name>
            <last-name>Melville</last-name>
        </author>
        <price>11.99</price>
    </book>
    <book genre="philosophy" publicationdate="1991-02-15" ISBN="1-861001-57-6">
        <title>The Gorgias</title>
        <author>
            <name>Plato</name>
        </author>
        <price>9.99</price>
    </book>
</bookstore>

Anche il file contosoBooks.xsd viene considerato come input.

<?xml version="1.0" encoding="utf-8"?>
<xs:schema attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.contoso.com/books" xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:element name="bookstore">
        <xs:complexType>
            <xs:sequence>
                <xs:element maxOccurs="unbounded" name="book">
                    <xs:complexType>
                        <xs:sequence>
                            <xs:element name="title" type="xs:string" />
                            <xs:element name="author">
                                <xs:complexType>
                                    <xs:sequence>
                                        <xs:element minOccurs="0" name="name" type="xs:string" />
                                        <xs:element minOccurs="0" name="first-name" type="xs:string" />
                                        <xs:element minOccurs="0" name="last-name" type="xs:string" />
                                    </xs:sequence>
                                </xs:complexType>
                            </xs:element>
                            <xs:element name="price" type="xs:decimal" />
                        </xs:sequence>
                        <xs:attribute name="genre" type="xs:string" use="required" />
                        <xs:attribute name="publicationdate" type="xs:date" use="required" />
                        <xs:attribute name="ISBN" type="xs:string" use="required" />
                    </xs:complexType>
                </xs:element>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:schema>

Commenti

La classe XmlSchemaValidator fornisce un meccanismo efficiente e a elevate prestazioni per la convalida basata sul metodo push di dati XML in base a schemi XML. Ad esempio, la classe XmlSchemaValidator consente di convalidare un infoset XML sul posto senza la necessità di serializzarlo come documento XML e di eseguire nuovamente l'analisi del documento mediante un lettore XML di convalida. La XmlSchemaValidator classe può essere usata anche per compilare motori di convalida su origini dati XML personalizzate o come modo per compilare un writer XML di convalida.

Per altre informazioni sulla XmlSchemaValidator classe , vedere l'argomento XmlSchemaValidator Push-Based Validation .

Costruttori

Proprietà

Metodi

Eventi

Si applica a

Vedi anche

• XmlSerializer
• Convalida basata sul metodo push di XmlSchemaValidator