VisualCollection Classe

Definizione

public ref class VisualCollection sealed : System::Collections::ICollection

public sealed class VisualCollection : System.Collections.ICollection

type VisualCollection = class
    interface ICollection
    interface IEnumerable

Public NotInheritable Class VisualCollection
Implements ICollection

Ereditarietà

Object

VisualCollection

Implementazioni

ICollection IEnumerable

Esempio

Nell'esempio seguente viene illustrato come creare un VisualCollection oggetto e aggiungervi membri.

// Create a host visual derived from the FrameworkElement class.
// This class provides layout, event handling, and container support for
// the child visual objects.
public class MyVisualHost : FrameworkElement
{
    // Create a collection of child visual objects.
    private VisualCollection _children;

    public MyVisualHost()
    {
        _children = new VisualCollection(this);
        _children.Add(CreateDrawingVisualRectangle());
        _children.Add(CreateDrawingVisualText());
        _children.Add(CreateDrawingVisualEllipses());

        // Add the event handler for MouseLeftButtonUp.
        this.MouseLeftButtonUp += new System.Windows.Input.MouseButtonEventHandler(MyVisualHost_MouseLeftButtonUp);
    }

' Create a host visual derived from the FrameworkElement class.
' This class provides layout, event handling, and container support for
' the child visual objects.
Public Class MyVisualHost
    Inherits FrameworkElement
    ' Create a collection of child visual objects.
    Private _children As VisualCollection

    Public Sub New()
        _children = New VisualCollection(Me)
        _children.Add(CreateDrawingVisualRectangle())
        _children.Add(CreateDrawingVisualText())
        _children.Add(CreateDrawingVisualEllipses())

        ' Add the event handler for MouseLeftButtonUp.
        AddHandler MouseLeftButtonUp, AddressOf MyVisualHost_MouseLeftButtonUp
    End Sub

Commenti

Un VisualCollection oggetto ha un'affinità di contesto implicita. Se una routine tenta di accedere VisualCollection a da un contesto diverso rispetto al contesto del proprietario ContainerVisual, viene generata un'eccezione.