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PropertyMetadata Constructor (Object, PropertyChangedCallback)

Initializes a new instance of the PropertyMetadata class with the specified default value and PropertyChangedCallback implementation reference.

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

public PropertyMetadata(
	Object defaultValue,
	PropertyChangedCallback propertyChangedCallback


Type: System.Object
The default value of the dependency property, usually provided as a value of some specific type.
Type: System.Windows.PropertyChangedCallback
Reference to a handler implementation that is to be called by the property system whenever the effective value of the property changes.


defaultValue cannot be set to the value UnsetValue; see Remarks.

The type of the value provided defaultValue must be match or be related to the type specified in the original registration of the dependency property that this metadata will be applied to. Mismatches between metadata default value type and the type of the dependency property it is being applied to can be difficult to debug, because the mismatch is not detectable during compilation (the mismatch will raise a run-time exception).

Although it is the default per the parameterless constructor, a defaultValue of UnsetValue cannot be specified. Attempting to do so will raise an exception.

static PropertyMetadata pm;


pm = new PropertyMetadata(
    new PropertyChangedCallback(OnCurrentReadingChanged)

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.