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.
Assembly: System.Xml (in System.Xml.dll)
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>
System.Xml.Schema.XmlSchemaObject
System.Xml.Schema.XmlSchemaAnnotated
System.Xml.Schema.XmlSchemaFacet
System.Xml.Schema.XmlSchemaPatternFacet
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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.