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DependencyObject.ClearValue, méthode (DependencyProperty)

Clears the local value of a property. The property to be cleared is specified by a DependencyProperty identifier.

Espace de noms: System.Windows
Assembly : WindowsBase (dans windowsbase.dll)

public void ClearValue (
	DependencyProperty dp
)
public void ClearValue (
	DependencyProperty dp
)
public function ClearValue (
	dp : DependencyProperty
)
Vous ne pouvez pas utiliser des méthodes dans XAML.

Paramètres

dp

The dependency property to be cleared, identified by a DependencyProperty object reference.

Type d'exceptionCondition

InvalidOperationException

Attempted to call ClearValue on a sealed DependencyObject.

Clearing the property value by calling ClearValue does not necessarily give a dependency property the default value that is specified in the dependency property metadata; it only specifically clears whatever local value may have been applied. For more information, see Dependency Property Value Precedence.

The following example iterates all properties that have local values set on an object, then calls ClearValue to clear the values of each such property.

void RestoreDefaultProperties(object sender, RoutedEventArgs e)
{
    UIElementCollection uic = Sandbox.Children;
    foreach (Shape uie in uic)
    {
        LocalValueEnumerator locallySetProperties = uie.GetLocalValueEnumerator();
        while (locallySetProperties.MoveNext())
        {
            DependencyProperty propertyToClear = (DependencyProperty)locallySetProperties.Current.Property;
            if (!propertyToClear.ReadOnly) { uie.ClearValue(propertyToClear); }
        }
    }
}

Microsoft .NET Framework 3.0 est pris en charge sur Windows Vista, Microsoft Windows XP SP2 et Windows Server 2003 SP1.

.NET Framework

Prise en charge dans : 3.0

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