PropertyMetadata.CoerceValueCallback Property (System.Windows)

CoerceValueCallback Property

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Microsoft Visual Studio 2010/.NET Framework 4

Other versions are also available for the following:

.NET Framework Class Library

PropertyMetadata..::.CoerceValueCallback Property

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

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

Syntax

Visual Basic

Public Property CoerceValueCallback As CoerceValueCallback
    Get
    Set

public CoerceValueCallback CoerceValueCallback { get; set; }

Visual C++

public:
property CoerceValueCallback^ CoerceValueCallback {
    CoerceValueCallback^ get ();
    void set (CoerceValueCallback^ value);
}

member CoerceValueCallback : CoerceValueCallback with get, set

Property Value

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

Exceptions

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

Remarks

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.

Version Information

.NET Framework

Supported in: 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

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.

Reference

PropertyMetadata Class

System.Windows Namespace

Other Resources

Dependency Property Metadata