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Metodo DependencyObject.ClearValue (DependencyProperty)

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

Spazio dei nomi: System.Windows
Assembly: WindowsBase (in windowsbase.dll)

public void ClearValue (
	DependencyProperty dp
)
public void ClearValue (
	DependencyProperty dp
)
public function ClearValue (
	dp : DependencyProperty
)
Non è possibile utilizzare metodi in XAML.

Parametri

dp

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

Tipo di eccezioneCondizione

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 è supportato in Windows Vista, Microsoft Windows XP SP2 e Windows Server 2003 SP1.

.NET Framework

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