DefaultValue Property

PropertyMetadata.DefaultValue Property

 

Gets or sets the default value of the dependency property.

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

public object DefaultValue { get; set; }

Property Value

Type: System.Object

The 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.

Members of this type are not typically used in XAML.

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