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XmlSchemaSimpleTypeUnion Class
.NET Framework 3.0
Represents the union element for simple types from XML Schema as specified by the . A union datatype can be used to specify the content of a simpleType. The value of the simpleType element must be any one of a set of alternative datatypes specified in the union. Union types are always derived types and must comprise at least two alternative datatypes.
Namespace: System.Xml.Schema
Assembly: System.Xml (in system.xml.dll)
Assembly: System.Xml (in system.xml.dll)
The following example shows the use of XmlSchemaSimpleTypeUnion class.
Imports System Imports System.Xml Imports System.Xml.Schema Class XMLSchemaExamples Public Shared Sub Main() Dim schema As New XmlSchema() ' <xs:simpleType name="StringOrIntType"> Dim StringOrIntType As New XmlSchemaSimpleType() StringOrIntType.Name = "StringOrIntType" schema.Items.Add(StringOrIntType) ' <xs:union> Dim union As New XmlSchemaSimpleTypeUnion StringOrIntType.Content = union ' <xs:simpleType> Dim simpleType1 As New XmlSchemaSimpleType union.BaseTypes.Add(simpleType1) ' <xs:restriction base="xs:string"/> Dim restriction1 As New XmlSchemaSimpleTypeRestriction() restriction1.BaseTypeName = New XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema") simpleType1.Content = restriction1 ' <xs:simpleType> Dim simpleType2 As New XmlSchemaSimpleType() union.BaseTypes.Add(simpleType2) ' <xs:restriction base="xs:int"/> Dim restriction2 As New XmlSchemaSimpleTypeRestriction() restriction2.BaseTypeName = New XmlQualifiedName("int", "http://www.w3.org/2001/XMLSchema") simpleType2.Content = restriction2 ' <xs:element name="size" type="StringOrIntType"/> Dim elementSize As New XmlSchemaElement() elementSize.Name = "size" elementSize.SchemaTypeName = New XmlQualifiedName("StringOrIntType") schema.Items.Add(elementSize) 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 this code example.
<?xml version="1.0" encoding="IBM437"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:simpleType name="StringOrIntType">
<xs:union>
<xs:simpleType>
<xs:restriction base="xs:string"/>
</xs:simpleType>
<xs:simpleType>
<xs:restriction base="xs:int"/>
</xs:simpleType>
</xs:union>
</xs:simpleType>
<xs:element name="size" type="StringOrIntType"/>
</xs:schema>
System.Object
System.Xml.Schema.XmlSchemaObject
System.Xml.Schema.XmlSchemaAnnotated
System.Xml.Schema.XmlSchemaSimpleTypeContent
System.Xml.Schema.XmlSchemaSimpleTypeUnion
System.Xml.Schema.XmlSchemaObject
System.Xml.Schema.XmlSchemaAnnotated
System.Xml.Schema.XmlSchemaSimpleTypeContent
System.Xml.Schema.XmlSchemaSimpleTypeUnion
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.Community Additions
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