FrameworkElement.ActualHeight FrameworkElement.ActualHeight FrameworkElement.ActualHeight FrameworkElement.ActualHeight Property

Définition

Obtient la hauteur rendue de cet élément.Gets the rendered height of this element.

public:
 property double ActualHeight { double get(); };
public double ActualHeight { get; }
member this.ActualHeight : double
Public ReadOnly Property ActualHeight As Double

Valeur de propriété

Hauteur de l'élément, exprimée en unités indépendantes des appareils (1/96e de pouce par unité)device-independent units (1/96th inch per unit).The element's height, as a value in unités indépendantes des appareils (1/96e de pouce par unité)device-independent units (1/96th inch per unit). La valeur par défaut est 0 (zéro).The default value is 0 (zero).

Exemples

L’exemple suivant affiche les différentes propriétés de hauteur.The following example displays various height properties.

private void changeHeight(object sender, SelectionChangedEventArgs args)
{
    ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);
    Double sz1 = Double.Parse(li.Content.ToString());
    rect1.Height = sz1;
    rect1.UpdateLayout();
    txt1.Text= "ActualHeight is set to " + rect1.ActualHeight;
    txt2.Text= "Height is set to " + rect1.Height;
    txt3.Text= "MinHeight is set to " + rect1.MinHeight;
    txt4.Text= "MaxHeight is set to " + rect1.MaxHeight;
}
private void changeMinHeight(object sender, SelectionChangedEventArgs args)
{
    ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);
    Double sz1 = Double.Parse(li.Content.ToString());
    rect1.MinHeight = sz1;
    rect1.UpdateLayout();
    txt1.Text= "ActualHeight is set to " + rect1.ActualHeight;
    txt2.Text= "Height is set to " + rect1.Height;
    txt3.Text= "MinHeight is set to " + rect1.MinHeight;
    txt4.Text= "MaxHeight is set to " + rect1.MaxHeight;
}
private void changeMaxHeight(object sender, SelectionChangedEventArgs args)
{
    ListBoxItem li = ((sender as ListBox).SelectedItem as ListBoxItem);
    Double sz1 = Double.Parse(li.Content.ToString());
    rect1.MaxHeight = sz1;
    rect1.UpdateLayout();
    txt1.Text= "ActualHeight is set to " + rect1.ActualHeight;
    txt2.Text= "Height is set to " + rect1.Height;
    txt3.Text= "MinHeight is set to " + rect1.MinHeight;
    txt4.Text= "MaxHeight is set to " + rect1.MaxHeight;
}
Private Sub changeHeight(ByVal sender As Object, ByVal args As SelectionChangedEventArgs)
    Dim li As ListBoxItem = CType(CType(sender, ListBox).SelectedItem, ListBoxItem)
    Dim sz1 As Double = Double.Parse(li.Content.ToString())
    rect1.Height = sz1
    rect1.UpdateLayout()
    txt1.Text = "ActualHeight is set to " + rect1.ActualHeight.ToString
    txt2.Text = "Height is set to " + rect1.Height.ToString
    txt3.Text = "MinHeight is set to " + rect1.MinHeight.ToString
    txt4.Text = "MaxHeight is set to " + rect1.MaxHeight.ToString
End Sub
Private Sub changeMinHeight(ByVal sender As Object, ByVal args As SelectionChangedEventArgs)

    Dim li As ListBoxItem = CType(CType(sender, ListBox).SelectedItem, ListBoxItem)
    Dim sz1 As Double = Double.Parse(li.Content.ToString())
    rect1.MinHeight = sz1
    rect1.UpdateLayout()
    txt1.Text = "ActualHeight is set to " + rect1.ActualHeight.ToString
    txt2.Text = "Height is set to " + rect1.Height.ToString
    txt3.Text = "MinHeight is set to " + rect1.MinHeight.ToString
    txt4.Text = "MaxHeight is set to " + rect1.MaxHeight.ToString
End Sub
Private Sub changeMaxHeight(ByVal sender As Object, ByVal args As SelectionChangedEventArgs)

    Dim li As ListBoxItem = CType(CType(sender, ListBox).SelectedItem, ListBoxItem)
    Dim sz1 As Double = Double.Parse(li.Content.ToString())
    rect1.MaxHeight = sz1
    rect1.UpdateLayout()
    txt1.Text = "ActualHeight is set to " + rect1.ActualHeight.ToString
    txt2.Text = "Height is set to " + rect1.Height.ToString
    txt3.Text = "MinHeight is set to " + rect1.MinHeight.ToString
    txt4.Text = "MaxHeight is set to " + rect1.MaxHeight.ToString
End Sub

Remarques

Cette propriété est une valeur calculée basée sur les autres entrées de hauteur et le système de disposition.This property is a calculated value based on other height inputs, and the layout system. La valeur est définie par le système de disposition lui-même, selon une passe de rendu et peut donc rester légèrement derrière la valeur définie des propriétés telles que Height qui constituent la base de la modification d’entrée.The value is set by the layout system itself, based on an actual rendering pass, and may therefore lag slightly behind the set value of properties such as Height that are the basis of the input change.

Étant donné que ActualHeight est une valeur calculée, vous devez être conscient qu’il peut y avoir plusieurs ou incrémentielles signalées modifications à la suite de diverses opérations par le système de disposition.Because ActualHeight is a calculated value, you should be aware that there could be multiple or incremental reported changes to it as a result of various operations by the layout system. Celui-ci peut en effet calculer l’espace de mesure requis pour les éléments enfants, les contraintes de l’élément parent, et ainsi de suite.The layout system may be calculating required measure space for child elements, constraints by the parent element, and so on.

Bien que vous ne pouvez pas définir cette propriété à partir de XAMLXAML, vous pouvez baser un Trigger sur sa valeur dans un style.Although you cannot set this property from XAMLXAML, you can base a Trigger upon its value in a style.

Informations sur les propriétés de dépendanceDependency Property Information

Champ d’identificateurIdentifier field ActualHeightProperty
La valeur des propriétés de métadonnées trueMetadata properties set to true Aucun.None

S’applique à