XmlSchemaDatatype クラスとは何？わかりやすく解説 Weblio辞書

XmlSchemaDatatype クラス

XmlSchemaDatatype クラスは、XML スキーマ定義言語 (XSD: XML Schema Definition Language) 型を共通言語ランタイム (CLR: Common Language Runtime) 型に割り当てるための抽象クラスです。

名前空間: System.Xml.Schema
アセンブリ: System.Xml (system.xml.dll 内)
構文

Visual Basic (宣言)

Public MustInherit Class
 XmlSchemaDatatype

Visual Basic (使用法)

Dim instance As XmlSchemaDatatype

public abstract class XmlSchemaDatatype

C++

public ref class XmlSchemaDatatype abstract

public abstract class XmlSchemaDatatype

JScript

public abstract class XmlSchemaDatatype

使用例

XmlSchemaDatatype クラスの使用例を次に示します。

Visual Basic

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

        schemaSet.Add(schema)
        schemaSet.Compile()

        Dim compiledSchema As XmlSchema = Nothing

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

        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
        xtr.Close()
    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

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

class XMLSchemaExamples
{
    public static void Main()
    {
        XmlTextReader xtr = new XmlTextReader("example.xsd");
        XmlSchema schema = XmlSchema.Read(xtr, new ValidationEventHandler(ValidationCallbackOne));

        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;
        }



        foreach (XmlSchemaObject schemaObject in
 compiledSchema.Items)
        {
            if (schemaObject.GetType() == typeof(XmlSchemaSimpleType))
            {
                XmlSchemaSimpleType simpleType = (XmlSchemaSimpleType)schemaObject;
                Console.WriteLine("{0} {1}", simpleType.Name, simpleType.Datatype.ValueType);
            }
            if (schemaObject.GetType() == typeof(XmlSchemaComplexType))
            {
                XmlSchemaComplexType complexType = (XmlSchemaComplexType)schemaObject;
                Console.WriteLine("{0} {1}", complexType.Name, complexType.Datatype.ValueType);
            }
        }
        xtr.Close();
    }

    public static void ValidationCallbackOne(object
 sender, ValidationEventArgs args)
    {
        Console.WriteLine(args.Message);
    }
}

前述のコード例に対して使用される XML ファイルを次に示します。

<?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"/>
        </xs:restriction>
    </xs:simpleType>
</xs:schema>