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DependencyObject.ClearValue Method (DependencyPropertyKey)

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

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

public void ClearValue(
	DependencyPropertyKey key
)

Parameters

key
Type: System.Windows.DependencyPropertyKey
The key for the dependency property to be cleared.

ExceptionCondition
InvalidOperationException

Attempted to call ClearValue on a sealed DependencyObject.

A DependencyPropertyKey identifies a read-only dependency property for property system operations. Classes that define read-only dependency properties should not expose this key with public access. A publicly exposed key would provide a public code pathway that negated the read-only character of the property, if methods such as ClearValue or SetValue could be called outside the class or assembly, referencing the key.

Clearing the property value by calling ClearValue does not necessarily give a dependency property the default value that is specified in the dependency property metadata. Clearing the value only specifically clears whatever local value may have been applied. For more information, see Dependency Property Value Precedence.

.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.

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