XmlSchemaChoice Class
Represents the choice element (compositor) from the XML Schema as specified by the World Wide Web Consortium (W3C). The choice allows only one of its children to appear in an instance.
Assembly: System.Xml (in System.Xml.dll)
The following example creates a choice element.
Option Strict On Option Explicit On Imports System Imports System.Xml Imports System.Xml.Schema Class XMLSchemaExamples Public Shared Sub Main() Dim schema As New XmlSchema() ' <xs:element name="selected"/> Dim xeSelected As New XmlSchemaElement() xeSelected.Name = "selected" schema.Items.Add(xeSelected) ' <xs:element name="unselected"/> Dim xeUnselected As New XmlSchemaElement() xeUnselected.Name = "unselected" schema.Items.Add(xeUnselected) ' <xs:element name="dimpled"/> Dim xeDimpled As New XmlSchemaElement() xeDimpled.Name = "dimpled" schema.Items.Add(xeDimpled) ' <xs:element name="perforated"/> Dim xePerforated As New XmlSchemaElement() xePerforated.Name = "perforated" schema.Items.Add(xePerforated) ' <xs:complexType name="chadState"> Dim chadState As New XmlSchemaComplexType() schema.Items.Add(chadState) chadState.Name = "chadState" ' <xs:choice minOccurs="1" maxOccurs="1"> Dim choice As New XmlSchemaChoice() chadState.Particle = choice choice.MinOccurs = 1 choice.MaxOccurs = 1 ' <xs:element ref="selected"/> Dim elementSelected As New XmlSchemaElement() choice.Items.Add(elementSelected) elementSelected.RefName = New XmlQualifiedName("selected") ' <xs:element ref="unselected"/> Dim elementUnselected As New XmlSchemaElement() choice.Items.Add(elementUnselected) elementUnselected.RefName = New XmlQualifiedName("unselected") ' <xs:element ref="dimpled"/> Dim elementDimpled As New XmlSchemaElement() choice.Items.Add(elementDimpled) elementDimpled.RefName = New XmlQualifiedName("dimpled") ' <xs:element ref="perforated"/> Dim elementPerforated As New XmlSchemaElement() choice.Items.Add(elementPerforated) elementPerforated.RefName = New XmlQualifiedName("perforated") 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 'Main Public Shared Sub ValidationCallbackOne(ByVal sender As Object, ByVal args As ValidationEventArgs) Console.WriteLine(args.Message) End Sub 'ValidationCallbackOne End Class 'XMLSchemaExamples
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:element name="selected"/>
<xs:element name="unselected"/>
<xs:element name="dimpled"/>
<xs:element name="perforated"/>
<xs:complexType name="chadState">
<xs:choice minOccurs="1" maxOccurs="1">
<xs:element ref="selected"/>
<xs:element ref="unselected"/>
<xs:element ref="dimpled"/>
<xs:element ref="perforated"/>
</xs:choice>
</xs:complexType>
</xs:schema>
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.