XmlSchemaSimpleTypeUnion Class

 

Represents the union element for simple types from XML Schema as specified by the World Wide Web Consortium (W3C). 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)

System.Object
  System.Xml.Schema.XmlSchemaObject
    System.Xml.Schema.XmlSchemaAnnotated
      System.Xml.Schema.XmlSchemaSimpleTypeContent
        System.Xml.Schema.XmlSchemaSimpleTypeUnion

public class XmlSchemaSimpleTypeUnion : XmlSchemaSimpleTypeContent

NameDescription
System_CAPS_pubmethodXmlSchemaSimpleTypeUnion()

Initializes a new instance of the XmlSchemaSimpleTypeUnion class.

NameDescription
System_CAPS_pubpropertyAnnotation

Gets or sets the annotation property.(Inherited from XmlSchemaAnnotated.)

System_CAPS_pubpropertyBaseMemberTypes

Gets an array of XmlSchemaSimpleType objects representing the type of the simpleType element based on the BaseTypes and MemberTypes values of the simple type.

System_CAPS_pubpropertyBaseTypes

Gets the collection of base types.

System_CAPS_pubpropertyId

Gets or sets the string id.(Inherited from XmlSchemaAnnotated.)

System_CAPS_pubpropertyLineNumber

Gets or sets the line number in the file to which the schema element refers.(Inherited from XmlSchemaObject.)

System_CAPS_pubpropertyLinePosition

Gets or sets the line position in the file to which the schema element refers.(Inherited from XmlSchemaObject.)

System_CAPS_pubpropertyMemberTypes

Gets or sets the array of qualified member names of built-in data types or simpleType elements defined in this schema (or another schema indicated by the specified namespace).

System_CAPS_pubpropertyNamespaces

Gets or sets the XmlSerializerNamespaces to use with this schema object.(Inherited from XmlSchemaObject.)

System_CAPS_pubpropertyParent

Gets or sets the parent of this XmlSchemaObject.(Inherited from XmlSchemaObject.)

System_CAPS_pubpropertySourceUri

Gets or sets the source location for the file that loaded the schema.(Inherited from XmlSchemaObject.)

System_CAPS_pubpropertyUnhandledAttributes

Gets or sets the qualified attributes that do not belong to the current schema's target namespace.(Inherited from XmlSchemaAnnotated.)

NameDescription
System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

A union type enables an element or attribute value to be one or more instances of one type drawn from the union of multiple atomic and list types.

The following example shows the use of XmlSchemaSimpleTypeUnion class.

using System;
using System.Xml;
using System.Xml.Schema;

class XMLSchemaExamples
{
    public static void Main()
    {

        XmlSchema schema = new XmlSchema();

        //<xs:simpleType name="StringOrIntType">
        XmlSchemaSimpleType StringOrIntType = new XmlSchemaSimpleType();
        StringOrIntType.Name = "StringOrIntType";
        schema.Items.Add(StringOrIntType);

        // <xs:union>
        XmlSchemaSimpleTypeUnion union = new XmlSchemaSimpleTypeUnion();
        StringOrIntType.Content = union;

        // <xs:simpleType>
        XmlSchemaSimpleType simpleType1 = new XmlSchemaSimpleType();
        union.BaseTypes.Add(simpleType1);

        // <xs:restriction base="xs:string"/>
        XmlSchemaSimpleTypeRestriction restriction1 = new XmlSchemaSimpleTypeRestriction();
        restriction1.BaseTypeName = new XmlQualifiedName("string", "http://www.w3.org/2001/XMLSchema");
        simpleType1.Content = restriction1;

        // <xs:simpleType>
        XmlSchemaSimpleType simpleType2 = new XmlSchemaSimpleType();
        union.BaseTypes.Add(simpleType2);

        // <xs:restriction base="xs:int"/>
        XmlSchemaSimpleTypeRestriction restriction2 = new XmlSchemaSimpleTypeRestriction();
        restriction2.BaseTypeName = new XmlQualifiedName("int", "http://www.w3.org/2001/XMLSchema");
        simpleType2.Content = restriction2;


        // <xs:element name="size" type="StringOrIntType"/>
        XmlSchemaElement elementSize = new XmlSchemaElement();
        elementSize.Name = "size";
        elementSize.SchemaTypeName = new XmlQualifiedName("StringOrIntType");
        schema.Items.Add(elementSize);

        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 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>

.NET Framework
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.

Return to top
Show: