ComponentCollectionとは? わかりやすく解説

ComponentCollection クラス

IComponent オブジェクトのコレクション用の読み取り専用コンテナを提供します。

名前空間: System.ComponentModel
アセンブリ: System (system.dll 内)
構文構文

<ComVisibleAttribute(True)> _
Public Class ComponentCollection
    Inherits ReadOnlyCollectionBase
Dim instance As ComponentCollection
[ComVisibleAttribute(true)] 
public class ComponentCollection : ReadOnlyCollectionBase
[ComVisibleAttribute(true)] 
public ref class ComponentCollection : public
 ReadOnlyCollectionBase
/** @attribute ComVisibleAttribute(true) */ 
public class ComponentCollection extends ReadOnlyCollectionBase
ComVisibleAttribute(true) 
public class ComponentCollection extends
 ReadOnlyCollectionBase
解説解説

このコレクションは ReadOnlyCollectionBase から継承します。クラス コンストラクタを使用した場合だけに、このコレクションに IComponent オブジェクトを追加できます。

このコレクションは、文字列インデクサと整数インデクサの 2 つのインデクサ プロパティを提供します。文字列インデクサ プロパティは、コレクションに含まれるコンポーネントの Site プロパティが null 参照 (Visual Basic では Nothing) ではなく、コンポーネントの Site プロパティの Name プロパティが指定した文字列に一致する場合、名前によってコレクション内のコンポーネントを正しく返します。整数インデクサ プロパティは、指定したコレクション インデックスの IComponent を返します。CopyTo メソッドは、コレクションの内容を指定された配列にコピーします。配列への書き込みは指定されたインデックスから開始されます。

メモメモ

このクラスに適用される HostProtectionAttribute 属性の Resources プロパティの値は、Synchronization です。HostProtectionAttribute は、デスクトップ アプリケーション (一般的には、アイコンをダブルクリック、コマンドを入力、またはブラウザに URL を入力して起動するアプリケーション) には影響しません。詳細については、HostProtectionAttribute クラスのトピックまたは「SQL Server プログラミングとホスト保護属性」を参照してください。

使用例使用例

ComponentCollection を使用して、カスタム BookComponent オブジェクトのコレクションを列挙する方法を次のコード例に示します。

    'This code segment implements the IContainer interface.  The code segment
 
    'containing the implementation of ISite and IComponent can be found
 in the documentation
    'for those interfaces.
    
    'Implement the LibraryContainer using the IContainer interface.

Class LibraryContainer
    Implements IContainer
    Private m_bookList As ArrayList

    Public Sub New()
        m_bookList = New ArrayList()
    End Sub

    Public Sub Add(ByVal
 book As IComponent) Implements IContainer.Add
        'The book will be added without creation of the ISite object.
        m_bookList.Add(book)
    End Sub

    Public Sub Add(ByVal
 book As IComponent, ByVal ISNDNNum As
 String) Implements IContainer.Add

        Dim i As Integer
        Dim curObj As IComponent

        For i = 0 To m_bookList.Count - 1
            curObj = CType(m_bookList(i), IComponent)
            If Not curObj.Site Is
 Nothing Then
                If (curObj.Site.Name.Equals(ISNDNNum)) Then
                    Throw New SystemException("The
 ISBN number already exists in the container")
                End If
            End If
        Next i

        Dim data As ISBNSite = New
 ISBNSite(Me, book)
        data.Name = ISNDNNum
        book.Site = data
        m_bookList.Add(book)

    End Sub

    Public Sub Remove(ByVal
 book As IComponent) Implements IContainer.Remove
        Dim i As Integer
        Dim curComp As BookComponent = CType(book,
 BookComponent)

        For i = 0 To m_bookList.Count - 1
            If (curComp.Equals(m_bookList(i)) = True)
 Then
                m_bookList.RemoveAt(i)
                Exit For
            End If
        Next i
    End Sub


    Public ReadOnly Property
 Components() As ComponentCollection Implements
 IContainer.Components
        Get
            Dim datalist(m_bookList.Count - 1) As
 IComponent
            
            m_bookList.CopyTo(datalist)
            Return New ComponentCollection(datalist)
        End Get
    End Property

    Public Overridable Sub
 Dispose() Implements IDisposable.Dispose
        Dim i As Integer
        For i = 0 To m_bookList.Count - 1
            Dim curObj As IComponent = CType(m_bookList(i),
 IComponent)
            curObj.Dispose()
        Next i

        m_bookList.Clear()
    End Sub

    Public Shared Sub Main()
        Dim cntrExmpl As LibraryContainer =
 New LibraryContainer()

        Try
            Dim book1 As BookComponent = New
 BookComponent("Wizard's First Rule", "Terry Gooodkind")
            cntrExmpl.Add(book1, "0812548051")
            Dim book2 As BookComponent = New
 BookComponent("Stone of Tears", "Terry
 Gooodkind")
            cntrExmpl.Add(book2, "0812548094")
            Dim book3 As BookComponent = New
 BookComponent("Blood of the Fold", "Terry
 Gooodkind")
            cntrExmpl.Add(book3, "0812551478")
            Dim book4 As BookComponent = New
 BookComponent("The Soul of the Fire", "Terry
 Gooodkind")
            'This will generate an exception, because the ISBN already
 exists in the container.
            cntrExmpl.Add(book4, "0812551478")
        Catch e As SystemException
            Console.WriteLine("Error description: "
 + e.Message)
        End Try

        Dim datalist As ComponentCollection
 = cntrExmpl.Components
        Dim denum As IEnumerator = datalist.GetEnumerator()

        While (denum.MoveNext())
            Dim cmp As BookComponent = CType(denum.Current,
 BookComponent)
            Console.WriteLine("Book Title: " + cmp.Title)
            Console.WriteLine("Book Author: " + cmp.Author)
            Console.WriteLine("Book ISBN: " + cmp.Site.Name)
        End While
    End Sub
End Class
//This code segment implements the IContainer interface.  The code segment
 
//containing the implementation of ISite and IComponent can be found
 in the documentation
//for those interfaces.

//Implement the LibraryContainer using the IContainer interface.

class LibraryContainer : IContainer
{
    private ArrayList m_bookList;

    public LibraryContainer()
    {
        m_bookList = new ArrayList();
    }

    public virtual void Add(IComponent book)
    {
        //The book will be added without creation of the ISite object.
        m_bookList.Add(book);
    }

    public virtual void Add(IComponent book,
 string ISNDNNum)
    {
        for(int i =0; i < m_bookList.Count;
 ++i)
        {
            IComponent curObj = (IComponent)m_bookList[i];
            if(curObj.Site != null)
            {
                if(curObj.Site.Name.Equals(ISNDNNum))
                    throw new SystemException("The ISBN number
 already exists in the container"); 
            }
        }

        ISBNSite data = new ISBNSite(this,
 book);
        data.Name = ISNDNNum;
        book.Site = data;
        m_bookList.Add(book);
    }

    public virtual void Remove(IComponent book)
    {
        for(int i =0; i < m_bookList.Count;
 ++i)
        {                
            if(book.Equals(m_bookList[i]))
            {
                m_bookList.RemoveAt(i);
                    break;
            }
        }
    }

    public ComponentCollection Components
    {
        get
        {
            IComponent[] datalist = new BookComponent[m_bookList.Count];
            m_bookList.CopyTo(datalist);
            return new ComponentCollection(datalist);
        }
    }

    public virtual void Dispose()
    {    
        for(int i =0; i < m_bookList.Count;
 ++i)
        {
            IComponent curObj = (IComponent)m_bookList[i];
            curObj.Dispose();
        }
        
        m_bookList.Clear();
    }

    static void Main(string[]
 args)
    {
        LibraryContainer cntrExmpl = new LibraryContainer();

        try
        {
            BookComponent book1 = new BookComponent("Wizard's
 First Rule", "Terry Gooodkind");
            cntrExmpl.Add(book1, "0812548051");
            BookComponent book2 = new BookComponent("Stone
 of Tears", "Terry Gooodkind");
            cntrExmpl.Add(book2, "0812548094");
            BookComponent book3 = new BookComponent("Blood
 of the Fold", "Terry Gooodkind");
            cntrExmpl.Add(book3, "0812551478");
            BookComponent book4 = new BookComponent("The
 Soul of the Fire", "Terry Gooodkind");
            //This will generate exception because the ISBN already
 exists in the container.
            cntrExmpl.Add(book4, "0812551478");
        }
        catch(SystemException e)
        {
            Console.WriteLine("Error description: " + e.Message);
        }

        ComponentCollection datalist =cntrExmpl.Components;
        IEnumerator denum = datalist.GetEnumerator();

        while(denum.MoveNext())
        {
            BookComponent cmp = (BookComponent)denum.Current;
            Console.WriteLine("Book Title: " + cmp.Title);
            Console.WriteLine("Book Author: " + cmp.Author);
            Console.WriteLine("Book ISBN: " + cmp.Site.Name);
        }
    }
}
// This code segment implements the IContainer interface. The code segment
 
// containing the implementation of ISite and IComponent can be found
 in 
// the documentation for those interfaces.
// Implement the LibraryContainer using the IContainer interface.
class LibraryContainer implements IContainer
{
    private ArrayList mBookList;

    public LibraryContainer()
    {
        mBookList = new ArrayList();
    } //LibraryContainer

    public void Add(IComponent book)
    {
        // The book will be added without creation of the ISite object.
        mBookList.Add(book);
    } //Add

    public void Add(IComponent book, String
 isndNNum) throws SystemException
    {
        for (int i = 0; i < mBookList.get_Count();
 ++i) {
            IComponent curObj = (IComponent)mBookList.get_Item(i);
            if (curObj.get_Site() != null)
 {
                if (curObj.get_Site().get_Name().Equals(isndNNum))
 {
                    throw new SystemException(
                        "The ISBN number already exists in
 the container");
                }
            }
        }
        ISBNSite data = new ISBNSite(this,
 book);
        data.set_Name(isndNNum);
        book.set_Site(data);
        mBookList.Add(book);
    } //Add

    public void Remove(IComponent book)
    {
        for (int i = 0; i < mBookList.get_Count();
 ++i) {
            if (book.Equals(mBookList.get_Item(i))) {
                mBookList.RemoveAt(i);
                break;
            }
        }
    } //Remove

    /** @property 
     */
    public ComponentCollection get_Components()
    {
        IComponent dataList[] = new BookComponent[mBookList.get_Count()];
        mBookList.CopyTo(dataList);
        return new ComponentCollection(dataList);
    } //get_Components

    public void Dispose()
    {
        for (int i = 0; i < mBookList.get_Count();
 ++i) {
            IComponent curObj = (IComponent)mBookList.get_Item(i);
            curObj.Dispose();
        }
        mBookList.Clear();
    } //Dispose

    public static void main(String[]
 args)
    {
        LibraryContainer cntrExmpl = new LibraryContainer();
        try {
            BookComponent book1 = new BookComponent("Wizard's
 First Rule", 
                "Terry Gooodkind");
            cntrExmpl.Add(book1, "0812548051");
            BookComponent book2 = new BookComponent("Stone
 of Tears", 
                "Terry Gooodkind");
            cntrExmpl.Add(book2, "0812548094");
            BookComponent book3 = new BookComponent("Blood
 of the Fold", 
                "Terry Gooodkind");
            cntrExmpl.Add(book3, "0812551478");
            BookComponent book4 = new BookComponent("The
 Soul of the Fire", 
                "Terry Gooodkind");

            // This will generate exception because the ISBN already
 exists in 
            // the container.
            cntrExmpl.Add(book4, "0812551478");
        }
        catch (SystemException e) {
            Console.WriteLine("Error description: " + e.get_Message());
        }
        ComponentCollection dataList = cntrExmpl.get_Components();
        IEnumerator denum = dataList.GetEnumerator();

        while (denum.MoveNext()) {
            BookComponent cmp = (BookComponent)denum.get_Current();
            Console.WriteLine("Book Title: " + cmp.get_Title());
            Console.WriteLine("Book Author: " + cmp.get_Author());
            Console.WriteLine("Book ISBN: " + cmp.get_Site().get_Name());
        }
    } //main
} //LibraryContainer
継承階層継承階層
System.Object
   System.Collections.ReadOnlyCollectionBase
    System.ComponentModel.ComponentCollection
スレッド セーフスレッド セーフ
この型の public static (Visual Basic では Shared) メンバはすべて、スレッド セーフです。インスタンス メンバの場合は、スレッド セーフであるとは限りません。
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照

ComponentCollection コンストラクタ

指定したコンポーネントの配列を使用して、ComponentCollection クラスの新しいインスタンスを初期化します。

名前空間: System.ComponentModel
アセンブリ: System (system.dll 内)
構文構文

Public Sub New ( _
    components As IComponent() _
)
Dim components As IComponent()

Dim instance As New ComponentCollection(components)
public ComponentCollection (
    IComponent[] components
)
public:
ComponentCollection (
    array<IComponent^>^ components
)
public ComponentCollection (
    IComponent[] components
)
public function ComponentCollection (
    components : IComponent[]
)

パラメータ

components

コレクションを初期化するために使用する IComponent オブジェクトの配列。

解説解説

このメソッドは、指定した IComponent 配列の各 IComponent をコレクションに追加します。

使用例使用例

BookComponent オブジェクトの配列から ComponentCollection を作成する方法を次のコード例に示します。

    'This code segment implements the IContainer interface.  The code segment
 
    'containing the implementation of ISite and IComponent can be found
 in the documentation
    'for those interfaces.
    
    'Implement the LibraryContainer using the IContainer interface.

Class LibraryContainer
    Implements IContainer
    Private m_bookList As ArrayList

    Public Sub New()
        m_bookList = New ArrayList()
    End Sub

    Public Sub Add(ByVal
 book As IComponent) Implements IContainer.Add
        'The book will be added without creation of the ISite object.
        m_bookList.Add(book)
    End Sub

    Public Sub Add(ByVal
 book As IComponent, ByVal ISNDNNum As
 String) Implements IContainer.Add

        Dim i As Integer
        Dim curObj As IComponent

        For i = 0 To m_bookList.Count - 1
            curObj = CType(m_bookList(i), IComponent)
            If Not curObj.Site Is
 Nothing Then
                If (curObj.Site.Name.Equals(ISNDNNum)) Then
                    Throw New SystemException("The
 ISBN number already exists in the container")
                End If
            End If
        Next i

        Dim data As ISBNSite = New
 ISBNSite(Me, book)
        data.Name = ISNDNNum
        book.Site = data
        m_bookList.Add(book)

    End Sub

    Public Sub Remove(ByVal
 book As IComponent) Implements IContainer.Remove
        Dim i As Integer
        Dim curComp As BookComponent = CType(book,
 BookComponent)

        For i = 0 To m_bookList.Count - 1
            If (curComp.Equals(m_bookList(i)) = True)
 Then
                m_bookList.RemoveAt(i)
                Exit For
            End If
        Next i
    End Sub


    Public ReadOnly Property
 Components() As ComponentCollection Implements
 IContainer.Components
        Get
            Dim datalist(m_bookList.Count - 1) As
 IComponent
            
            m_bookList.CopyTo(datalist)
            Return New ComponentCollection(datalist)
        End Get
    End Property

    Public Overridable Sub
 Dispose() Implements IDisposable.Dispose
        Dim i As Integer
        For i = 0 To m_bookList.Count - 1
            Dim curObj As IComponent = CType(m_bookList(i),
 IComponent)
            curObj.Dispose()
        Next i

        m_bookList.Clear()
    End Sub

    Public Shared Sub Main()
        Dim cntrExmpl As LibraryContainer =
 New LibraryContainer()

        Try
            Dim book1 As BookComponent = New
 BookComponent("Wizard's First Rule", "Terry Gooodkind")
            cntrExmpl.Add(book1, "0812548051")
            Dim book2 As BookComponent = New
 BookComponent("Stone of Tears", "Terry
 Gooodkind")
            cntrExmpl.Add(book2, "0812548094")
            Dim book3 As BookComponent = New
 BookComponent("Blood of the Fold", "Terry
 Gooodkind")
            cntrExmpl.Add(book3, "0812551478")
            Dim book4 As BookComponent = New
 BookComponent("The Soul of the Fire", "Terry
 Gooodkind")
            'This will generate an exception, because the ISBN already
 exists in the container.
            cntrExmpl.Add(book4, "0812551478")
        Catch e As SystemException
            Console.WriteLine("Error description: "
 + e.Message)
        End Try

        Dim datalist As ComponentCollection
 = cntrExmpl.Components
        Dim denum As IEnumerator = datalist.GetEnumerator()

        While (denum.MoveNext())
            Dim cmp As BookComponent = CType(denum.Current,
 BookComponent)
            Console.WriteLine("Book Title: " + cmp.Title)
            Console.WriteLine("Book Author: " + cmp.Author)
            Console.WriteLine("Book ISBN: " + cmp.Site.Name)
        End While
    End Sub
End Class
//This code segment implements the IContainer interface.  The code segment
 
//containing the implementation of ISite and IComponent can be found
 in the documentation
//for those interfaces.

//Implement the LibraryContainer using the IContainer interface.

class LibraryContainer : IContainer
{
    private ArrayList m_bookList;

    public LibraryContainer()
    {
        m_bookList = new ArrayList();
    }

    public virtual void Add(IComponent book)
    {
        //The book will be added without creation of the ISite object.
        m_bookList.Add(book);
    }

    public virtual void Add(IComponent book,
 string ISNDNNum)
    {
        for(int i =0; i < m_bookList.Count;
 ++i)
        {
            IComponent curObj = (IComponent)m_bookList[i];
            if(curObj.Site != null)
            {
                if(curObj.Site.Name.Equals(ISNDNNum))
                    throw new SystemException("The ISBN number
 already exists in the container"); 
            }
        }

        ISBNSite data = new ISBNSite(this,
 book);
        data.Name = ISNDNNum;
        book.Site = data;
        m_bookList.Add(book);
    }

    public virtual void Remove(IComponent book)
    {
        for(int i =0; i < m_bookList.Count;
 ++i)
        {                
            if(book.Equals(m_bookList[i]))
            {
                m_bookList.RemoveAt(i);
                    break;
            }
        }
    }

    public ComponentCollection Components
    {
        get
        {
            IComponent[] datalist = new BookComponent[m_bookList.Count];
            m_bookList.CopyTo(datalist);
            return new ComponentCollection(datalist);
        }
    }

    public virtual void Dispose()
    {    
        for(int i =0; i < m_bookList.Count;
 ++i)
        {
            IComponent curObj = (IComponent)m_bookList[i];
            curObj.Dispose();
        }
        
        m_bookList.Clear();
    }

    static void Main(string[]
 args)
    {
        LibraryContainer cntrExmpl = new LibraryContainer();

        try
        {
            BookComponent book1 = new BookComponent("Wizard's
 First Rule", "Terry Gooodkind");
            cntrExmpl.Add(book1, "0812548051");
            BookComponent book2 = new BookComponent("Stone
 of Tears", "Terry Gooodkind");
            cntrExmpl.Add(book2, "0812548094");
            BookComponent book3 = new BookComponent("Blood
 of the Fold", "Terry Gooodkind");
            cntrExmpl.Add(book3, "0812551478");
            BookComponent book4 = new BookComponent("The
 Soul of the Fire", "Terry Gooodkind");
            //This will generate exception because the ISBN already
 exists in the container.
            cntrExmpl.Add(book4, "0812551478");
        }
        catch(SystemException e)
        {
            Console.WriteLine("Error description: " + e.Message);
        }

        ComponentCollection datalist =cntrExmpl.Components;
        IEnumerator denum = datalist.GetEnumerator();

        while(denum.MoveNext())
        {
            BookComponent cmp = (BookComponent)denum.Current;
            Console.WriteLine("Book Title: " + cmp.Title);
            Console.WriteLine("Book Author: " + cmp.Author);
            Console.WriteLine("Book ISBN: " + cmp.Site.Name);
        }
    }
}
// This code segment implements the IContainer interface. The code segment
 
// containing the implementation of ISite and IComponent can be found
 in 
// the documentation for those interfaces.
// Implement the LibraryContainer using the IContainer interface.
class LibraryContainer implements IContainer
{
    private ArrayList mBookList;

    public LibraryContainer()
    {
        mBookList = new ArrayList();
    } //LibraryContainer

    public void Add(IComponent book)
    {
        // The book will be added without creation of the ISite object.
        mBookList.Add(book);
    } //Add

    public void Add(IComponent book, String
 isndNNum) throws SystemException
    {
        for (int i = 0; i < mBookList.get_Count();
 ++i) {
            IComponent curObj = (IComponent)mBookList.get_Item(i);
            if (curObj.get_Site() != null)
 {
                if (curObj.get_Site().get_Name().Equals(isndNNum))
 {
                    throw new SystemException(
                        "The ISBN number already exists in
 the container");
                }
            }
        }
        ISBNSite data = new ISBNSite(this,
 book);
        data.set_Name(isndNNum);
        book.set_Site(data);
        mBookList.Add(book);
    } //Add

    public void Remove(IComponent book)
    {
        for (int i = 0; i < mBookList.get_Count();
 ++i) {
            if (book.Equals(mBookList.get_Item(i))) {
                mBookList.RemoveAt(i);
                break;
            }
        }
    } //Remove

    /** @property 
     */
    public ComponentCollection get_Components()
    {
        IComponent dataList[] = new BookComponent[mBookList.get_Count()];
        mBookList.CopyTo(dataList);
        return new ComponentCollection(dataList);
    } //get_Components

    public void Dispose()
    {
        for (int i = 0; i < mBookList.get_Count();
 ++i) {
            IComponent curObj = (IComponent)mBookList.get_Item(i);
            curObj.Dispose();
        }
        mBookList.Clear();
    } //Dispose

    public static void main(String[]
 args)
    {
        LibraryContainer cntrExmpl = new LibraryContainer();
        try {
            BookComponent book1 = new BookComponent("Wizard's
 First Rule", 
                "Terry Gooodkind");
            cntrExmpl.Add(book1, "0812548051");
            BookComponent book2 = new BookComponent("Stone
 of Tears", 
                "Terry Gooodkind");
            cntrExmpl.Add(book2, "0812548094");
            BookComponent book3 = new BookComponent("Blood
 of the Fold", 
                "Terry Gooodkind");
            cntrExmpl.Add(book3, "0812551478");
            BookComponent book4 = new BookComponent("The
 Soul of the Fire", 
                "Terry Gooodkind");

            // This will generate exception because the ISBN already
 exists in 
            // the container.
            cntrExmpl.Add(book4, "0812551478");
        }
        catch (SystemException e) {
            Console.WriteLine("Error description: " + e.get_Message());
        }
        ComponentCollection dataList = cntrExmpl.get_Components();
        IEnumerator denum = dataList.GetEnumerator();

        while (denum.MoveNext()) {
            BookComponent cmp = (BookComponent)denum.get_Current();
            Console.WriteLine("Book Title: " + cmp.get_Title());
            Console.WriteLine("Book Author: " + cmp.get_Author());
            Console.WriteLine("Book ISBN: " + cmp.get_Site().get_Name());
        }
    } //main
} //LibraryContainer
プラットフォームプラットフォーム
バージョン情報バージョン情報
参照参照
関連項目
ComponentCollection クラス
ComponentCollection メンバ
System.ComponentModel 名前空間

ComponentCollection プロパティ


ComponentCollection メソッド


パブリック メソッドパブリック メソッド

プロテクト メソッドプロテクト メソッド
参照参照

関連項目

ComponentCollection クラス
System.ComponentModel 名前空間
IComponent

ComponentCollection メンバ

IComponent オブジェクトのコレクション用の読み取り専用コンテナを提供します。

ComponentCollection データ型で公開されるメンバを以下の表に示します。


パブリック コンストラクタパブリック コンストラクタ
パブリック プロパティパブリック プロパティ
プロテクト プロパティプロテクト プロパティ
  名前 説明
プロテクト プロパティ InnerList  ReadOnlyCollectionBase インスタンスに格納されている要素のリストを取得します。(ReadOnlyCollectionBase から継承されます。)
パブリック メソッドパブリック メソッド
プロテクト メソッドプロテクト メソッド
参照参照

関連項目

ComponentCollection クラス
System.ComponentModel 名前空間
IComponent



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