XmlAttributes.XmlArrayItems プロパティとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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XmlAttributes.XmlArrayItems プロパティ

パブリックフィールドまたは読み書き可能プロパティによって返された配列に挿入されている項目を XmlSerializer によってシリアル化する方法を指定するオブジェクトのコレクションを取得または設定します。

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

Visual Basic (宣言)

Public ReadOnly Property
 XmlArrayItems As XmlArrayItemAttributes

Visual Basic (使用法)

Dim instance As XmlAttributes
Dim value As XmlArrayItemAttributes

value = instance.XmlArrayItems

public XmlArrayItemAttributes XmlArrayItems { get;
 }

C++

public:
property XmlArrayItemAttributes^ XmlArrayItems {
    XmlArrayItemAttributes^ get ();
}

/** @property */
public XmlArrayItemAttributes get_XmlArrayItems ()

JScript

public function get XmlArrayItems
 () : XmlArrayItemAttributes

プロパティ値
XmlArrayItemAttribute オブジェクトのコレクションを格納している XmlArrayItemAttributes オブジェクト。

解説

XmlArrayItems プロパティにより、パブリックフィールドまたは読み書き可能なパブリックプロパティが返した配列に挿入できる派生型を指定できます。フィールドやプロパティに新しい型を指定する場合、XmlArrayItemAttribute オブジェクトを作成し、それを XmlArrayItems プロパティによって返される XmlArrayItemAttributes に Add メソッドを使用して追加します。新しい型は、そのフィールドまたはプロパティに受け入れられる型から派生した型である必要があります。Add メソッドで、XmlAttributes オブジェクトを XmlAttributeOverrides オブジェクトに追加し、フィールドまたはプロパティを格納しているオブジェクトの型、およびフィールドまたはプロパティの名前を指定します。Serialize メソッドまたは Deserialize メソッドを呼び出す前に、XmlAttributeOverrides オブジェクトで XmlSerializer を構築します。

使用例

オブジェクトの配列を返す Members という名前のフィールドを含むクラスをシリアル化する例を次に示します。2 つの XmlArrayItemAttribute オブジェクトが作成され、Member という名前の基本クラスから派生したオブジェクトをフィールドが受け入れるようになります。各オブジェクトは、XmlArrayItems プロパティをとおして XmlAttributes に追加されます。

Visual Basic

Imports System
Imports System.IO
Imports System.Xml
Imports System.Xml.Serialization


' This is the class that will be serialized.
Public Class Group
    Public Members() As Member
End Class

Public Class Member
    Public MemberName As String
End Class

Public Class NewMember
    Inherits Member
    Public MemberID As Integer
End Class

Public Class RetiredMember
    Inherits NewMember
    Public RetireDate As DateTime
End Class


Public Class Run
    
    Public Shared Sub Main()
        Dim test As New
 Run()
        test.SerializeObject("OverrideArrayItem.xml")
        test.DeserializeObject("OverrideArrayItem.xml")
    End Sub    
    
    ' Return an XmlSerializer used for overriding. 
    Public Function CreateOverrider() As
 XmlSerializer
        ' Create XmlAttributeOverrides and XmlAttributes objects.
        Dim xOver As New
 XmlAttributeOverrides()
        Dim xAttrs As New
 XmlAttributes()
        
        ' Add an override for the XmlArrayItem.    
        Dim xArrayItem As New
 XmlArrayItemAttribute(GetType(NewMember))
        xArrayItem.Namespace = "http://www.cpandl.com"
        xAttrs.XmlArrayItems.Add(xArrayItem)
        
        ' Add a second override.
        Dim xArrayItem2 As New
 XmlArrayItemAttribute(GetType(RetiredMember))
        xArrayItem2.Namespace = "http://www.cpandl.com"
        xAttrs.XmlArrayItems.Add(xArrayItem2)
        
        ' Add all overrides to XmlAttribueOverrides object.
        xOver.Add(GetType(Group), "Members",
 xAttrs)
        
        ' Create the XmlSerializer and return it.
        Return New XmlSerializer(GetType(Group),
 xOver)
    End Function 
    
    
    Public Sub SerializeObject(ByVal
 filename As String)
        ' Create an instance of the XmlSerializer class.
        Dim mySerializer As XmlSerializer =
 CreateOverrider()
        ' Writing the file requires a TextWriter.
        Dim writer As New
 StreamWriter(filename)
        
        ' Create an instance of the class that will be serialized.
        Dim myGroup As New
 Group()
        
        ' Set the object properties.
        Dim m As New NewMember()
        m.MemberName = "Paul"
        m.MemberID = 2
        
        ' Create a second member.
        Dim m2 As New RetiredMember()
        m2.MemberName = "Renaldo"
        m2.MemberID = 23
        m2.RetireDate = New DateTime(2000, 10, 10)
        
        myGroup.Members = New Member(1) {m, m2}
        
        ' Serialize the class, and close the TextWriter.
        mySerializer.Serialize(writer, myGroup)
        writer.Close()
    End Sub    
    
    Public Sub DeserializeObject(ByVal
 filename As String)
        Dim mySerializer As XmlSerializer =
 CreateOverrider()
        Dim fs As New FileStream(filename,
 FileMode.Open)
        Dim myGroup As Group = CType(mySerializer.Deserialize(fs),
 Group)
        Dim m As Member
        For Each m In  myGroup.Members
            Console.WriteLine(m.MemberName)
        Next m
    End Sub
End Class

using System;
using System.IO;
using System.Xml;
using System.Xml.Serialization;

// This is the class that will be serialized.
public class Group
{
    public Member [] Members;
}

public class Member
{
    public string MemberName;
}

public class NewMember:Member
{
    public int MemberID;
}

public class RetiredMember:NewMember
{
    public DateTime RetireDate;
}
    

public class Run
{
   public static void Main()
   {
      Run test = new Run();
      test.SerializeObject("OverrideArrayItem.xml");
      test.DeserializeObject("OverrideArrayItem.xml");
   }

   // Return an XmlSerializer used for overriding. 
   public XmlSerializer CreateOverrider()
   {
      // Create XmlAttributeOverrides and XmlAttributes objects.
      XmlAttributeOverrides xOver = new XmlAttributeOverrides();
      XmlAttributes xAttrs = new XmlAttributes();

      // Add an override for the XmlArrayItem.    
      XmlArrayItemAttribute xArrayItem = 
      new XmlArrayItemAttribute(typeof(NewMember));
      xArrayItem.Namespace = "http://www.cpandl.com";
      xAttrs.XmlArrayItems.Add(xArrayItem);

      // Add a second override.
      XmlArrayItemAttribute xArrayItem2 = 
      new XmlArrayItemAttribute(typeof(RetiredMember));
      xArrayItem2.Namespace = "http://www.cpandl.com";
      xAttrs.XmlArrayItems.Add(xArrayItem2);

      // Add all overrides to XmlAttribueOverrides object.
      xOver.Add(typeof(Group), "Members", xAttrs);

      // Create the XmlSerializer and return it.
      return new XmlSerializer(typeof(Group),
 xOver);
   }
   
 
   public void SerializeObject(string
 filename)
   {
      // Create an instance of the XmlSerializer class.
      XmlSerializer mySerializer =  CreateOverrider();
      // Writing the file requires a TextWriter.
      TextWriter writer = new StreamWriter(filename);

      // Create an instance of the class that will be serialized.
      Group myGroup = new Group();

      // Set the object properties.
      NewMember m = new NewMember();
      m.MemberName = "Paul";
      m.MemberID = 2;

      // Create a second member.
      RetiredMember m2 = new RetiredMember();
      m2.MemberName = "Renaldo";
      m2.MemberID = 23;
      m2.RetireDate = new DateTime(2000, 10,10);

      myGroup.Members = new Member[2] {m, m2};
      
      // Serialize the class, and close the TextWriter.
      mySerializer.Serialize(writer, myGroup);
      writer.Close();
   }

   public void DeserializeObject(string
 filename)
   {
      XmlSerializer mySerializer = CreateOverrider();
      FileStream fs = new FileStream(filename, FileMode.Open);
      Group myGroup = (Group) 
      mySerializer.Deserialize(fs);
      foreach(Member m in myGroup.Members)
      {
          Console.WriteLine(m.MemberName);
      }
   }
}

C++

#using <System.Xml.dll>
#using <System.dll>

using namespace System;
using namespace System::IO;
using namespace System::Xml;
using namespace System::Xml::Serialization;
public ref class Member
{
public:
   String^ MemberName;
};

// This is the class that will be serialized.
public ref class Group
{
public:
   array<Member^>^Members;
};

public ref class NewMember: public
 Member
{
public:
   int MemberID;
};

public ref class RetiredMember: public
 NewMember
{
public:
   DateTime RetireDate;
};

// Return an XmlSerializer used for overriding. 
XmlSerializer^ CreateOverrider()
{
   // Create XmlAttributeOverrides and XmlAttributes objects.
   XmlAttributeOverrides^ xOver = gcnew XmlAttributeOverrides;
   XmlAttributes^ xAttrs = gcnew XmlAttributes;

   // Add an override for the XmlArrayItem.    
   XmlArrayItemAttribute^ xArrayItem = gcnew XmlArrayItemAttribute( NewMember::typeid
 );
   xArrayItem->Namespace = "http://www.cpandl.com";
   xAttrs->XmlArrayItems->Add( xArrayItem );

   // Add a second override.
   XmlArrayItemAttribute^ xArrayItem2 = gcnew XmlArrayItemAttribute( RetiredMember::typeid
 );
   xArrayItem2->Namespace = "http://www.cpandl.com";
   xAttrs->XmlArrayItems->Add( xArrayItem2 );

   // Add all overrides to XmlAttribueOverrides object.
   xOver->Add( Group::typeid, "Members", xAttrs );

   // Create the XmlSerializer and return it.
   return gcnew XmlSerializer( Group::typeid,xOver );
}

void SerializeObject( String^ filename )
{
   // Create an instance of the XmlSerializer class.
   XmlSerializer^ mySerializer = CreateOverrider();

   // Writing the file requires a TextWriter.
   TextWriter^ writer = gcnew StreamWriter( filename );

   // Create an instance of the class that will be serialized.
   Group^ myGroup = gcnew Group;

   // Set the object properties.
   NewMember^ m = gcnew NewMember;
   m->MemberName = "Paul";
   m->MemberID = 2;

   // Create a second member.
   RetiredMember^ m2 = gcnew RetiredMember;
   m2->MemberName = "Renaldo";
   m2->MemberID = 23;
   m2->RetireDate = DateTime(2000,10,10);
   array<Member^>^temp = {m,m2};
   myGroup->Members = temp;

   // Serialize the class, and close the TextWriter.
   mySerializer->Serialize( writer, myGroup );
   writer->Close();
}

void DeserializeObject( String^ filename )
{
   XmlSerializer^ mySerializer = CreateOverrider();
   FileStream^ fs = gcnew FileStream( filename,FileMode::Open );
   Group^ myGroup = dynamic_cast<Group^>(mySerializer->Deserialize( fs ));
   System::Collections::IEnumerator^ myEnum = myGroup->Members->GetEnumerator();
   while ( myEnum->MoveNext() )
   {
      Member^ m = safe_cast<Member^>(myEnum->Current);
      Console::WriteLine( m->MemberName );
   }
}

int main()
{
   SerializeObject( "OverrideArrayItem.xml" );
   DeserializeObject( "OverrideArrayItem.xml" );
}

import System.*;
import System.IO.*;
import System.Xml.*;
import System.Xml.Serialization.*;

// This is the class that will be serialized.
public class Group
{
    public Member members[];
} //Group

public class Member
{
    public String memberName;
} //Member

public class NewMember extends Member
{
    public int memberID;
} //NewMember

public class RetiredMember extends NewMember
{
    public DateTime retireDate;
} //RetiredMember

public class Run
{
    public static void main(String[]
 args)
    {
        Run test = new Run();
        test.SerializeObject("OverrideArrayItem.xml");
        test.DeserializeObject("OverrideArrayItem.xml");
    } //main

    // Return an XmlSerializer used for overriding. 
    public XmlSerializer CreateOverrider()
    {
        // Create XmlAttributeOverrides and XmlAttributes objects.
        XmlAttributeOverrides xOver = new XmlAttributeOverrides();
        XmlAttributes xAttrs = new XmlAttributes();

        // Add an override for the XmlArrayItem.    
        XmlArrayItemAttribute xArrayItem =
            new XmlArrayItemAttribute(NewMember.class.ToType());

        xArrayItem.set_Namespace("http://www.cpandl.com");
        xAttrs.get_XmlArrayItems().Add(xArrayItem);

        // Add a second override.
        XmlArrayItemAttribute xArrayItem2 =
            new XmlArrayItemAttribute(RetiredMember.class.ToType());

        xArrayItem2.set_Namespace("http://www.cpandl.com");
        xAttrs.get_XmlArrayItems().Add(xArrayItem2);

        // Add all overrides to XmlAttribueOverrides object.
        xOver.Add(Group.class.ToType(), "members", xAttrs);

        // Create the XmlSerializer and return it.
        return new XmlSerializer(Group.class.ToType(),
 xOver);
    } //CreateOverrider

    public void SerializeObject(String fileName)
    {
        // Create an instance of the XmlSerializer class.
        XmlSerializer mySerializer = CreateOverrider();

        // Writing the file requires a TextWriter.
        TextWriter writer = new StreamWriter(fileName);

        // Create an instance of the class that will be serialized.
        Group myGroup = new Group();

        // Set the object properties.
        NewMember m = new NewMember();
        m.memberName = "Paul";
        m.memberID = 2;

        // Create a second member.
        RetiredMember m2 = new RetiredMember();
        m2.memberName = "Renaldo";
        m2.memberID = 23;
        m2.retireDate = new DateTime(2000, 10, 10);
        myGroup.members = new Member[] { m, m2 };

        // Serialize the class, and close the TextWriter.
        mySerializer.Serialize(writer, myGroup);
        writer.Close();
    } //SerializeObject

    public void DeserializeObject(String fileName)
    {
        XmlSerializer mySerializer = CreateOverrider();
        FileStream fs = new FileStream(fileName, FileMode.Open);
        Group myGroup = (Group)mySerializer.Deserialize(fs);

        for (int iCtr = 0; iCtr < myGroup.members.length;
 iCtr++) {
            Member m = myGroup.members[iCtr];
            Console.WriteLine(m.memberName);
        }
    } //DeserializeObject
} //Run

プラットフォーム

Windows 98, Windows 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

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0

参照

関連項目
XmlAttributes クラス
XmlAttributes メンバ
System.Xml.Serialization 名前空間

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XmlAttributes.XmlArrayItems プロパティとは？ わかりやすく解説

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XmlAttributes.XmlArrayItems プロパティとは？わかりやすく解説