IComponent-Schnittstelle

Stellt Funktionen bereit, die von allen Komponenten benötigt werden.

Namespace: System.ComponentModel
Assembly: System (in system.dll)

Syntax

'Declaration
<ComVisibleAttribute(True)> _
Public Interface IComponent
    Inherits IDisposable
'Usage
Dim instance As IComponent

[ComVisibleAttribute(true)] 
public interface IComponent : IDisposable

[ComVisibleAttribute(true)] 
public interface class IComponent : IDisposable

/** @attribute ComVisibleAttribute(true) */ 
public interface IComponent extends IDisposable

ComVisibleAttribute(true) 
public interface IComponent extends IDisposable

Hinweise

Component ist die Standardimplementierung von IComponent und dient als Basisklasse für alle Komponenten der Common Language Runtime.

Sie können Komponenten in einem Container kapseln. In diesem Kontext bezieht sich Kapselung auf die logische Unterordnung, nicht auf die visuelle Einbettung. Sie können Komponenten und Container in verschiedenen Szenarien mit sowohl visuellen als auch nicht visuellen Bestandteilen verwenden.

System.Windows.Forms.Control erbt von Component, der Standardimplementierung von IComponent.

Eine Komponente interagiert mit dem Container primär über eine vom Container bereitgestellte ISite, die ein Repository der containerspezifischen, für die einzelnen Komponenten verfügbaren Informationen darstellt.

Hinweise für Implementierer Damit eine Klasse als Komponente gilt, muss sie die IComponent-Schnittstelle implementieren und einen einfachen Konstruktor bereitstellen, für den kein Parameter oder nur ein Parameter vom Typ IContainer erforderlich ist. Weitere Informationen über das Implementieren von IComponent finden Sie unter Programmieren mit Komponenten.

Beispiel

    'The following example demonstrates the implementation of 
    'ISite, IComponent, and IContainer for use in a simple library container.
    '
    'This example imports the System, System.ComponentModel, and System.Collections
    'namespaces.

    'This code segment implements the ISite and IComponent interfaces.
    'The implementation of the IContainer interface can be seen in the documentation 
    'of IContainer.

    'Implement the ISite interface.

    'The ISBNSite class represents the ISBN name of the book component
    
Class ISBNSite
    Implements ISite
    Private m_curComponent As IComponent
    Private m_curContainer As IContainer
    Private m_bDesignMode As Boolean
    Private m_ISBNCmpName As String

    Public Sub New(ByVal actvCntr As IContainer, ByVal prntCmpnt As IComponent)
        m_curComponent = prntCmpnt
        m_curContainer = actvCntr
        m_bDesignMode = False
        m_ISBNCmpName = Nothing
    End Sub

    'Support the ISite interface.
    Public ReadOnly Property Component() As IComponent Implements ISite.Component
        Get
            Return m_curComponent
        End Get
    End Property

    Public ReadOnly Property Container() As IContainer Implements ISite.Container
        Get
            Return m_curContainer
        End Get
    End Property

    Public ReadOnly Property DesignMode() As Boolean Implements ISite.DesignMode
        Get
            Return m_bDesignMode
        End Get
    End Property

    Public Property Name() As String Implements ISite.Name
        Get
            Return m_ISBNCmpName
        End Get
        Set(ByVal Value As String)
            m_ISBNCmpName = Value
        End Set
    End Property

    'Support the IServiceProvider interface.
    Public Function GetService(ByVal serviceType As Type) As Object Implements IServiceProvider.GetService
        'This example does not use any service object.
        GetService = Nothing
    End Function
End Class

'The BookComponent class represents the book component of the library container.
Class BookComponent
    Implements IComponent
    Public Event Disposed As EventHandler Implements IComponent.Disposed
    Private m_curISBNSite As ISite
    Private m_bookTitle As String
    Private m_bookAuthor As String

    Public Sub New(ByVal Title As String, ByVal Author As String)
        m_curISBNSite = Nothing
        m_bookTitle = Title
        m_bookAuthor = Author
    End Sub

    Public ReadOnly Property Title() As String
        Get
            Return m_bookTitle
        End Get
    End Property

    Public ReadOnly Property Author() As String
        Get
            Return m_bookAuthor
        End Get
    End Property

    Public Sub Dispose() Implements IDisposable.Dispose
        'There is nothing to clean.
        RaiseEvent Disposed(Me, EventArgs.Empty)
    End Sub

    Public Property Site() As ISite Implements IComponent.Site
        Get
            Return m_curISBNSite
        End Get
        Set(ByVal Value As ISite)
            m_curISBNSite = Value
        End Set
    End Property

    Public Overloads Function Equals(ByVal cmp As Object) As Boolean
        Dim cmpObj As BookComponent = CType(cmp, BookComponent)
        If (Me.Title.Equals(cmpObj.Title) And Me.Author.Equals(cmpObj.Author)) Then
            Equals = True
        Else
            Equals = False
        End If
    End Function

    Public Overrides Function GetHashCode() As Integer
        GetHashCode = MyBase.GetHashCode()
    End Function

End Class

/// <summary>
/// The following example demonstrates the implementation of 
/// ISite, IComponent, and IContainer for use in a simple library container.
///
/// This example uses the System, System.ComponentModel, and System.Collections
/// namespaces.
/// </summary>

//This code segment implements the ISite and IComponent interfaces.
//The implementation of the IContainer interface can be seen in the documentation 
//of IContainer.

//Implement the ISite interface.

// The ISBNSite class represents the ISBN name of the book component
class ISBNSite : ISite
{
    private IComponent m_curComponent;
    private IContainer m_curContainer;
    private bool m_bDesignMode;
    private string m_ISBNCmpName;

    public ISBNSite(IContainer actvCntr, IComponent prntCmpnt)
    {
        m_curComponent = prntCmpnt;
        m_curContainer = actvCntr;
        m_bDesignMode = false;
        m_ISBNCmpName = null;
    }

    //Support the ISite interface.
    public virtual IComponent Component
    {
        get
        {
            return m_curComponent;
        }
    }

    public virtual IContainer Container
    {
        get
        {
            return m_curContainer;
        }
    }
    
    public virtual bool DesignMode
    {
        get
        {
            return m_bDesignMode;
        }
    }

    public virtual string Name
    {
        get
        {
            return m_ISBNCmpName;
        }

        set
        {
            m_ISBNCmpName = value;
        }
    }

    //Support the IServiceProvider interface.
    public virtual object GetService(Type serviceType)
    {
        //This example does not use any service object.
        return null;
    }

}

// The BookComponent class represents the book component of the library container.

// This class implements the IComponent interface.

class BookComponent : IComponent
{
    public event EventHandler Disposed;
    private ISite m_curISBNSite;
    private string m_bookTitle;
    private string m_bookAuthor;

    public BookComponent(string Title, string Author)
    {
        m_curISBNSite = null;
        Disposed = null;
        m_bookTitle = Title;
        m_bookAuthor = Author;
    }

    public string Title
    {
        get
        {
            return m_bookTitle;
        }
    }

    public string Author
    {
        get
        {
            return m_bookAuthor;
        }
    }

    public virtual void Dispose()
    {    
        //There is nothing to clean.
        if(Disposed != null)
            Disposed(this,EventArgs.Empty);
    }

    public virtual ISite Site
    {
        get
        {
            return m_curISBNSite;
        }
        set
        {
            m_curISBNSite = value;
        }
    }

    public override bool Equals(object cmp)
    {
        BookComponent cmpObj = (BookComponent)cmp;
        if(this.Title.Equals(cmpObj.Title) && this.Author.Equals(cmpObj.Author))
            return true;

        return false;
    }

    public override int GetHashCode()
    {
        return base.GetHashCode();
    }
}

/// <summary>
/// The following example demonstrates the implementation of 
/// ISite, IComponent, and IContainer for use in a simple library container.
/// This example uses the System, System.ComponentModel, and System.Collections
/// namespaces.
/// </summary>

// This code segment implements the ISite and IComponent interfaces.
// The implementation of the IContainer interface can be seen in the 
// documentation of IContainer.

// Implement the ISite interface.
// The ISBNSite class represents the ISBN name of the book component
class ISBNSite implements ISite
{
    private IComponent mCurComponent;
    private IContainer mCurContainer;
    private boolean mbDesignMode;
    private String mISBNCmpName;

    public ISBNSite(IContainer actvCntr, IComponent prntCmpnt)
    {
        mCurComponent = prntCmpnt;
        mCurContainer = actvCntr;
        mbDesignMode = false;
        mISBNCmpName = null;
    } //ISBNSite

    //Support the ISite interface.
    /** @property 
     */
    public IComponent get_Component()
    {
        return mCurComponent;
    } //get_Component

    /** @property 
     */
    public IContainer get_Container()
    {
        return mCurContainer;
    } //get_Container

    /** @property 
     */
    public boolean get_DesignMode()
    {
        return mbDesignMode;
    } //get_DesignMode

    /** @property 
     */
    public String get_Name()
    {
        return mISBNCmpName;
    } //get_Name

    /** @property 
     */
    public void set_Name(String value)
    {
        mISBNCmpName = value;
    } //set_Name

    // Support the IServiceProvider interface.
    public Object GetService(Type serviceType)
    {
        // This example does not use any service object.
        return null;
    } //GetService
} //ISBNSite

// The BookComponent class represents the book component of the library 
// container. This class implements the IComponent interface.
class BookComponent implements IComponent
{
    public EventHandler disposed = null;

    /** @event 
     */
    public void add_Disposed(EventHandler p)
    {
        disposed = (EventHandler)System.Delegate.Combine(disposed, p);
    } //add_Disposed

    /** @event 
     */
    public void remove_Disposed(EventHandler p)
    {
        disposed = (EventHandler)System.Delegate.Remove(disposed, p);
    } //remove_Disposed

    private ISite mCurISBNSite;
    private String mBookTitle;
    private String mBookAuthor;

    public BookComponent(String title, String author)
    {
        mCurISBNSite = null;
        disposed = null;
        mBookTitle = title;
        mBookAuthor = author;
    } //BookComponent

    /** @property 
     */
    public String get_Title()
    {
        return mBookTitle;
    } //get_Title

    /** @property 
     */
    public String get_Author()
    {
        return mBookAuthor;
    } //get_Author

    public void Dispose()
    {
        // There is nothing to clean.
        if (disposed != null) {
            disposed.Invoke(this, EventArgs.Empty);
        }
    } //Dispose

    /** @property 
     */
    public ISite get_Site()
    {
        return mCurISBNSite;
    } //get_Site

    /** @property 
     */
    public void set_Site(ISite value)
    {
        mCurISBNSite = value;
    } //set_Site

    public boolean Equals(Object cmp)
    {
        BookComponent cmpObj = (BookComponent)cmp;
        if (this.get_Title().Equals(cmpObj.get_Title()) && this.get_Author().
                Equals(cmpObj.get_Author())) {
            return true;
        }
        return false;
    } //Equals

    public int GetHashCode()
    {
        return super.GetHashCode();
    } //GetHashCode
} //BookComponent

Plattformen

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile für Pocket PC, Windows Mobile für Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

.NET Framework unterstützt nicht alle Versionen sämtlicher Plattformen. Eine Liste der unterstützten Versionen finden Sie unter Systemanforderungen.

Versionsinformationen

.NET Framework

Unterstützt in: 2.0, 1.1, 1.0

.NET Compact Framework

Unterstützt in: 2.0, 1.0

Siehe auch

Referenz

IComponent-Member
System.ComponentModel-Namespace
Container-Klasse
IContainer
ISite
System.Windows.Forms.Control