PropertyMetadata.DefaultValue Property
Gets or sets the default value of the dependency property.
Namespace: System.Windows
Assembly: WindowsBase (in WindowsBase.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
Members of this type are not typically used in XAML.
Property Value
Type: System.ObjectThe default value of the property. The default value on a PropertyMetadata instance created with the parameterless constructor will be UnsetValue; see Remarks.
| Exception | Condition |
|---|---|
| ArgumentException | Cannot be set to the value UnsetValue once created; see Remarks. |
| InvalidOperationException | Cannot set a metadata property once it is applied to a dependency property operation. |
DefaultValue is defined in the object model as read-write. This is so DefaultValue can be adjusted after initialization of the PropertyMetadata object itself. However, once the metadata is consumed as part of a call to Register, AddOwner, or OverrideMetadata, the property system will seal that metadata instance and the properties are now considered immutable. Attempting to set DefaultValue once IsSealed is true on this metadata instance will raise an exception.
Although it is the default per the parameterless constructor, a defaultValue of UnsetValue cannot be set using either DefaultValue or the constructor. Attempting to do so will raise an exception.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
