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XmlSchemaPatternFacet Class

Represents the pattern element from XML Schema as specified by the World Wide Web Consortium (W3C). This class can be used to specify a restriction on the value entered for a simpleType element.

Namespace:  System.Xml.Schema
Assembly:  System.Xml (in System.Xml.dll)

'Declaration
Public Class XmlSchemaPatternFacet _
	Inherits XmlSchemaFacet
'Usage
Dim instance As XmlSchemaPatternFacet

The following example shows the use of the XmlSchemaPatternFacet class.

Imports System
Imports System.Xml
Imports System.Xml.Schema

Class XMLSchemaExamples
    Public Shared Sub Main()

        Dim schema As New XmlSchema()

        ' <xs:simpleType name="ZipCodeType"> 
        Dim ZipCodeType As New XmlSchemaSimpleType()
        ZipCodeType.Name = "ZipCodeType" 

        ' <xs:restriction base="xs:string"> 
        Dim restriction As New XmlSchemaSimpleTypeRestriction()
        restriction.BaseTypeName = New XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema")

        ' <xs:pattern value="[0-9]{5}(-[0-9]{4})?"/> 
        Dim pattern As New XmlSchemaPatternFacet()
        pattern.Value = "[0-9]{5}(-[0-9]{4})?"
        restriction.Facets.Add(pattern)

        ZipCodeType.Content = restriction

        schema.Items.Add(ZipCodeType)

        ' <xs:element name="Address"> 
        Dim element As New XmlSchemaElement()
        element.Name = "Address" 

        ' <xs:complexType> 
        Dim complexType As New XmlSchemaComplexType()

        ' <xs:attribute name="ZipCode" type="ZipCodeType"/> 
        Dim ZipCodeAttribute As New XmlSchemaAttribute()
        ZipCodeAttribute.Name = "ZipCode"
        ZipCodeAttribute.SchemaTypeName = New XmlQualifiedName("ZipCodeType", "")
        complexType.Attributes.Add(ZipCodeAttribute)

        element.SchemaType = complexType

        schema.Items.Add(element)

        Dim schemaSet As New XmlSchemaSet()
        AddHandler schemaSet.ValidationEventHandler, AddressOf ValidationCallbackOne

        schemaSet.Add(schema)
        schemaSet.Compile()

        Dim compiledSchema As XmlSchema = Nothing 

        For Each schema1 As XmlSchema In schemaSet.Schemas()
            compiledSchema = schema1
        Next 

        Dim nsmgr As New XmlNamespaceManager(New NameTable())
        nsmgr.AddNamespace("xs", "http://www.w3.org/2001/XMLSchema")
        compiledSchema.Write(Console.Out, nsmgr)

    End Sub 

    Public Shared Sub ValidationCallbackOne(ByVal sender As Object, ByVal args As ValidationEventArgs)
        Console.WriteLine(args.Message)
    End Sub 

End Class

The following XML file is generated for the preceding code example.

<?xml version="1.0" encoding="IBM437"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">

	<xs:simpleType name="ZipCodeType">
		<xs:restriction base="xs:string">
			<xs:pattern value="[0-9]{5}(-[0-9]{4})?"/>
		</xs:restriction>
	</xs:simpleType>

	<xs:element name="Address">
		<xs:complexType>
			<xs:attribute name="ZipCode" type="ZipCodeType"/>
		</xs:complexType>
	</xs:element>
	
</xs:schema>

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC, Xbox 360, Zune

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 3.5, 2.0

XNA Framework

Supported in: 3.0, 2.0, 1.0

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