DependencyObject Class
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DependencyObject Class


Represents an object that participates in the dependency property system.

Namespace:   System.Windows
Assembly:  WindowsBase (in WindowsBase.dll)

[NameScopePropertyAttribute("NameScope", typeof(NameScope))]
public class DependencyObject : DispatcherObject


Initializes a new instance of the DependencyObject class.


Gets the DependencyObjectType that wraps the CLR type of this instance. 


Gets the Dispatcher this DispatcherObject is associated with. (Inherited from DispatcherObject.)


Gets a value that indicates whether this instance is currently sealed (read-only).


Determines whether the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.)


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


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


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


Determines whether a provided DependencyObject is equivalent to the current DependencyObject.(Overrides Object.Equals(Object).)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Gets a hash code for this DependencyObject.(Overrides Object.GetHashCode().)


Creates a specialized enumerator for determining which dependency properties have locally set values on this DependencyObject.


Gets the Type of the current instance.(Inherited from Object.)


Returns the current effective value of a on this instance of a DependencyObject. GTMT


Re-evaluates the effective value for the specified dependency property


Creates a shallow copy of the current Object.(Inherited from Object.)


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


Returns the local value of a , if it exists. GTMT

System_CAPS_pubmethodSetCurrentValue(DependencyProperty, Object)

Sets the value of a without changing its value source. GTMT

System_CAPS_pubmethodSetValue(DependencyProperty, Object)

Sets the local value of a , specified by its dependency property identifier. GTMT

System_CAPS_pubmethodSetValue(DependencyPropertyKey, Object)

Sets the local value of a read-only , specified by the DependencyPropertyKey identifier of the dependency property. GTMT


Returns a value that indicates whether serialization processes should serialize the value for the provided .GTMT


Returns a string that represents the current object.(Inherited from Object.)


Enforces that the calling thread has access to this DispatcherObject.(Inherited from DispatcherObject.)

The DependencyObject class enables Windows Presentation Foundation (WPF) property system services on its many derived classes.

The property system's primary function is to compute the values of properties, and to provide system notification about values that have changed. Another key class that participates in the property system is DependencyPropertyDependencyProperty enables the registration of dependency properties into the property system, and provides identification and information about each dependency property, whereas DependencyObject as a base class enables objects to use the dependency properties.

DependencyObject services and characteristics include the following:

  • Dependency property hosting support. You register a dependency property by calling the Register method, and storing the method's return value as a public static field in your class.

  • Attached property hosting support. You register an attached property by calling the RegisterAttached method, and storing the method's return value as a public static read-only field in your class. (There are also additional member requirements; note that this represents a WPF specific implementation for attached properties. For details, see Attached Properties Overview.) Your attached property can then be set on any class that derives from DependencyObject.

  • Get, set, and clear utility methods for values of any dependency properties that exist on the DependencyObject.

  • Metadata, coerce value support, property changed notification, and override callbacks for dependency properties or attached properties. Also, the DependencyObject class facilitates the per-owner property metadata for a dependency property.

  • A common base class for classes derived from ContentElement, Freezable, or Visual. (UIElement, another base element class, has a class hierarchy that includes Visual.)

The following example derives from DependencyObject to create a new abstract class. The class then registers an attached property and includes support members for that attached property.

.NET Framework
Available since 3.0
Available since 2.0
Windows Phone Silverlight
Available since 7.0

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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