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)
| Name | Description | |
|---|---|---|
![]() | XmlSchemaChoice() | Initializes a new instance of the XmlSchemaChoice class. |
| 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 the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
The following example creates a choice element.
using System; using System.Xml; using System.Xml.Schema; class XMLSchemaExamples { public static void Main() { XmlSchema schema = new XmlSchema(); // <xs:element name="selected"/> XmlSchemaElement xeSelected = new XmlSchemaElement(); xeSelected.Name = "selected"; schema.Items.Add(xeSelected); // <xs:element name="unselected"/> XmlSchemaElement xeUnselected = new XmlSchemaElement(); xeUnselected.Name = "unselected"; schema.Items.Add(xeUnselected); // <xs:element name="dimpled"/> XmlSchemaElement xeDimpled = new XmlSchemaElement(); xeDimpled.Name = "dimpled"; schema.Items.Add(xeDimpled); // <xs:element name="perforated"/> XmlSchemaElement xePerforated = new XmlSchemaElement(); xePerforated.Name = "perforated"; schema.Items.Add(xePerforated); // <xs:complexType name="chadState"> XmlSchemaComplexType chadState = new XmlSchemaComplexType(); schema.Items.Add(chadState); chadState.Name = "chadState"; // <xs:choice minOccurs="1" maxOccurs="1"> XmlSchemaChoice choice = new XmlSchemaChoice(); chadState.Particle = choice; choice.MinOccurs = 1; choice.MaxOccurs = 1; // <xs:element ref="selected"/> XmlSchemaElement elementSelected = new XmlSchemaElement(); choice.Items.Add(elementSelected); elementSelected.RefName = new XmlQualifiedName("selected"); // <xs:element ref="unselected"/> XmlSchemaElement elementUnselected = new XmlSchemaElement(); choice.Items.Add(elementUnselected); elementUnselected.RefName = new XmlQualifiedName("unselected"); // <xs:element ref="dimpled"/> XmlSchemaElement elementDimpled = new XmlSchemaElement(); choice.Items.Add(elementDimpled); elementDimpled.RefName = new XmlQualifiedName("dimpled"); // <xs:element ref="perforated"/> XmlSchemaElement elementPerforated = new XmlSchemaElement(); choice.Items.Add(elementPerforated); elementPerforated.RefName = new XmlQualifiedName("perforated"); XmlSchemaSet schemaSet = new XmlSchemaSet(); schemaSet.ValidationEventHandler += new ValidationEventHandler(ValidationCallbackOne); schemaSet.Add(schema); schemaSet.Compile(); XmlSchema compiledSchema = null; foreach (XmlSchema schema1 in schemaSet.Schemas()) { compiledSchema = schema1; } XmlNamespaceManager nsmgr = new XmlNamespaceManager(new NameTable()); nsmgr.AddNamespace("xs", "http://www.w3.org/2001/XMLSchema"); compiledSchema.Write(Console.Out, nsmgr); } public static void ValidationCallbackOne(object sender, ValidationEventArgs args) { Console.WriteLine(args.Message); } }
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>
Available since 1.1
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.


