XmlSchemaChoice Class
Represents the choice element (compositor) from the XML Schema as specified by the . The choice allows only one of its children to appear in an instance.
Assembly: System.Xml (in System.Xml.dll)
The XmlSchemaChoice type exposes the following members.
| Name | Description | |
|---|---|---|
![]() ![]() | Annotation | Gets or sets the annotation property. (Inherited from XmlSchemaAnnotated.) |
![]() ![]() | Id | Gets or sets the string id. (Inherited from XmlSchemaAnnotated.) |
![]() ![]() | Items | Gets the collection of the elements contained with the compositor (choice): XmlSchemaElement, XmlSchemaGroupRef, XmlSchemaChoice, XmlSchemaSequence, or XmlSchemaAny. (Overrides XmlSchemaGroupBase.Items.) |
![]() ![]() | LineNumber | Gets or sets the line number in the file to which the schema element refers. (Inherited from XmlSchemaObject.) |
![]() ![]() | LinePosition | Gets or sets the line position in the file to which the schema element refers. (Inherited from XmlSchemaObject.) |
![]() ![]() | MaxOccurs | Gets or sets the maximum number of times the particle can occur. (Inherited from XmlSchemaParticle.) |
![]() ![]() | MaxOccursString | Gets or sets the number as a string value. Maximum number of times the particle can occur. (Inherited from XmlSchemaParticle.) |
![]() ![]() | MinOccurs | Gets or sets the minimum number of times the particle can occur. (Inherited from XmlSchemaParticle.) |
![]() ![]() | MinOccursString | Gets or sets the number as a string value. The minimum number of times the particle can occur. (Inherited from XmlSchemaParticle.) |
![]() ![]() | Namespaces | Gets or sets the XmlSerializerNamespaces to use with this schema object. (Inherited from XmlSchemaObject.) |
![]() ![]() | Parent | Gets or sets the parent of this XmlSchemaObject. (Inherited from XmlSchemaObject.) |
![]() ![]() | SourceUri | Gets or sets the source location for the file that loaded the schema. (Inherited from XmlSchemaObject.) |
![]() ![]() | UnhandledAttributes | Gets or sets the qualified attributes that do not belong to the current schema's target namespace. (Inherited from XmlSchemaAnnotated.) |
| Name | Description | |
|---|---|---|
![]() ![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() ![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() ![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() ![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() ![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() ![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
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 SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.



