XmlSchemaDatatype Class

The XmlSchemaDatatype class is an abstract class for mapping XML Schema definition language (XSD) types to Common Language Runtime (CLR) types.

Namespace: System.Xml.Schema
Assembly: System.Xml (in system.xml.dll)

Public MustInherit Class XmlSchemaDatatype
Dim instance As XmlSchemaDatatype

public abstract class XmlSchemaDatatype
public abstract class XmlSchemaDatatype
Not applicable.

The following example shows use of the XmlSchemaDatatype class.

Imports System
Imports System.Xml
Imports System.Xml.Schema


Class XMLSchemaExamples

    Public Shared Sub Main()
        Dim xtr As New XmlTextReader("example.xsd")
        Dim schema As XmlSchema = XmlSchema.Read(xtr, New ValidationEventHandler(AddressOf ValidationCallbackOne))

        Dim schemaSet As New XmlSchemaSet()
        AddHandler schemaSet.ValidationEventHandler, AddressOf ValidationCallbackOne


        Dim compiledSchema As XmlSchema = Nothing

        For Each schema1 As XmlSchema In schemaSet.Schemas()
            compiledSchema = schema1

        Dim schemaObject As XmlSchemaObject
        For Each schemaObject In compiledSchema.Items
            If schemaObject.GetType() Is GetType(XmlSchemaSimpleType) Then
                Dim simpleType As XmlSchemaSimpleType = CType(schemaObject, XmlSchemaSimpleType)
                Console.WriteLine("{0} {1}", simpleType.Name, simpleType.Datatype.ValueType)
            End If
            If schemaObject.GetType() Is GetType(XmlSchemaComplexType) Then
                Dim complexType As XmlSchemaComplexType = CType(schemaObject, XmlSchemaComplexType)
                Console.WriteLine("{0} {1}", complexType.Name, complexType.Datatype.ValueType)
            End If
        Next schemaObject
    End Sub 'Main

    Public Shared Sub ValidationCallbackOne(ByVal sender As Object, ByVal args As ValidationEventArgs)
    End Sub 'ValidationCallbackOne
End Class 'XMLSchemaExamples

The following XML file is used for the preceding code example.

<?xml version="1.0"?>
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
    <xs:simpleType name="LotteryNumber">
        <xs:restriction base="xs:int">
            <xs:minInclusive value="1"/>
            <xs:maxInclusive value="99"/>


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0

XNA Framework

Supported in: 1.0