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PropertyMetadata.CoerceValueCallback Property

Gets or sets a reference to a CoerceValueCallback implementation specified in this metadata.

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

public CoerceValueCallback CoerceValueCallback { get; set; }
You cannot set this property in XAML.

Property Value

Type: System.Windows.CoerceValueCallback
A CoerceValueCallback implementation reference.

ExceptionCondition
InvalidOperationException

Cannot set a metadata property once it is applied to a dependency property operation.

The callbacks in property metadata are not typically public members on the containing type, so the value of this property is not important for most scenarios that just consume an existing dependency property's metadata. One reason this property is exposed is so that metadata subclasses can perform their desired merge logic if both base metadata and overriding/adding metadata specify a CoerceValueCallback. However, the default merge logic for a CoerceValueCallback is to replace the previous one.

CoerceValueCallback is defined in the object model as read-write. This is so CoerceValueCallback 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 CoerceValueCallback once IsSealed is true on this metadata instance will raise an exception.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

.NET Framework

Supported in: 3.5, 3.0

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