Class DependencyObject

Represents an object that participates in the Silverlight dependency property system. DependencyObject is the immediate base class of several other important Silverlight classes, such as UIElement, Geometry, FrameworkTemplate, Style, and ResourceDictionary.

Inheritance

System.Object

DependencyObject

ComparisonCondition

ConditionalExpression

DependencyObjectCollection<T>

PresentationFrameworkCollection<T>

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: System.Windows

Assembly: OpenSilver.dll

Syntax

public class DependencyObject : IDependencyObject

Constructors

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DependencyObject()

Initializes a new instance of the DependencyObject class.

Declaration

public DependencyObject()

Properties

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Dispatcher

Gets the Dispatcher this object is associated with.

Declaration

public Dispatcher Dispatcher { get; }

Property Value

Type	Description
Dispatcher	The Dispatcher this object is associated with.

Methods

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CheckAccess()

Determines whether the calling thread has access to this object.

Declaration

[NotImplemented]
public bool CheckAccess()

Returns

Type	Description
System.Boolean	true if the calling thread has access to this object; otherwise, false.

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ClearValue(DependencyProperty)

Clears the local value of a dependency property.

Declaration

public void ClearValue(DependencyProperty dp)

Parameters

Type	Name	Description
DependencyProperty	dp	The DependencyProperty identifier of the property to clear the value for.

Exceptions

Type	Condition
System.ArgumentNullException	dp is null.

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ClearValue(DependencyPropertyKey)

Clears the local value of a read-only property. The property to be cleared is specified by a DependencyPropertyKey.

Declaration

public void ClearValue(DependencyPropertyKey key)

Parameters

Type	Name	Description
DependencyPropertyKey	key	The key for the dependency property to be cleared.

Exceptions

Type	Condition
System.ArgumentNullException	key is null.

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CoerceValue(DependencyProperty)

Coerces the value of the specified dependency property. This is accomplished by invoking any CoerceValueCallback function specified in property metadata for the dependency property as it exists on the calling DependencyObject.

Declaration

public void CoerceValue(DependencyProperty dp)

Parameters

Type	Name	Description
DependencyProperty	dp	The identifier for the dependency property to coerce.

Exceptions

Type	Condition
System.ArgumentNullException	dp is null.

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GetAnimationBaseValue(DependencyProperty)

Returns any base value established for a Silverlight dependency property, which would apply in cases where an animation is not active.

Declaration

public object GetAnimationBaseValue(DependencyProperty dp)

Parameters

Type	Name	Description
DependencyProperty	dp	The identifier for the desired dependency property.

Returns

Type	Description
System.Object	The returned base value.

Exceptions

Type	Condition
System.ArgumentNullException	dp is null.

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GetValue(DependencyProperty)

Returns the current effective value of a dependency property from a DependencyObject.

Declaration

public object GetValue(DependencyProperty dependencyProperty)

Parameters

Type	Name	Description
DependencyProperty	dependencyProperty	The DependencyProperty identifier of the property to retrieve the value for.

Returns

Type	Description
System.Object	Returns the current effective value.

Exceptions

Type	Condition
System.ArgumentNullException	dependencyProperty is null.

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INTERNAL_OnAttachedToVisualTree()

Declaration

protected virtual void INTERNAL_OnAttachedToVisualTree()

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INTERNAL_OnDetachedFromVisualTree()

Declaration

protected virtual void INTERNAL_OnDetachedFromVisualTree()

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OnPropertyChanged(DependencyPropertyChangedEventArgs)

Invoked whenever the effective value of any dependency property on this DependencyObject has been updated. The specific dependency property that changed is reported in the event data.

Declaration

protected virtual void OnPropertyChanged(DependencyPropertyChangedEventArgs e)

Parameters

Type	Name	Description
DependencyPropertyChangedEventArgs	e	Event data that will contain the dependency property identifier of interest, the property metadata for the type, and old and new values.

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ReadLocalValue(DependencyProperty)

Returns the local value of a dependency property, if a local value is set.

Declaration

public object ReadLocalValue(DependencyProperty dp)

Parameters

Type	Name	Description
DependencyProperty	dp	The DependencyProperty identifier of the property for which to retrieve the local value.

Returns

Type	Description
System.Object	Returns the local value, or returns the sentinel value UnsetValue if no local value is set.

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SetCurrentValue(DependencyProperty, Object)

Sets the value of a dependency property without changing its value source.

Declaration

public void SetCurrentValue(DependencyProperty dp, object value)

Parameters

Type	Name	Description
DependencyProperty	dp	The identifier of the dependency property to set.
System.Object	value	The new local value.

Exceptions

Type	Condition
System.ArgumentNullException	dp is null.
System.ArgumentException	value was not the correct type as registered for the dp property.

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SetValue(DependencyProperty, Object)

Sets the local value of a dependency property on a DependencyObject.

Declaration

public void SetValue(DependencyProperty dp, object value)

Parameters

Type	Name	Description
DependencyProperty	dp	The identifier of the dependency property to set.
System.Object	value	The new local value.

Exceptions

Type	Condition
System.ArgumentNullException	dp is null.
System.ArgumentException	value was not the correct type as registered for the dp property.

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SetValue(DependencyPropertyKey, Object)

Sets the local value of a read-only dependency property on a DependencyObject.

Declaration

public void SetValue(DependencyPropertyKey key, object value)

Parameters

Type	Name	Description
DependencyPropertyKey	key	The DependencyPropertyKey identifier of the property to set.
System.Object	value	The new local value.

Exceptions

Type	Condition
System.ArgumentNullException	key is null.
System.ArgumentException	value was not the correct type as registered for the property.

Extension Methods

DependencyObjectHelper.GetSelfAndAncestors(DependencyObject)

VisualTreeExtensions.GetVisualAncestors(DependencyObject)

VisualTreeExtensions.GetVisualAncestorsAndSelf(DependencyObject)

VisualTreeExtensions.GetVisualChildren(DependencyObject)

VisualTreeExtensions.GetVisualChildrenAndSelf(DependencyObject)

VisualTreeExtensions.GetVisualDescendants(DependencyObject)

VisualTreeExtensions.GetVisualDescendantsAndSelf(DependencyObject)

VisualTreeExtensions.GetVisualSiblings(DependencyObject)

VisualTreeExtensions.GetVisualSiblingsAndSelf(DependencyObject)