To avoid the possibility of an InvalidOperationException when calling this method, check the CanFreeze property to determine whether the Freezable can be made unmodifiable before calling this method.

This method uses the FreezeCore method to make the Freezable unmodifiable. To modify freezing behavior, override the FreezeCore method.

This example shows how to make a Freezable read-only by calling its Freeze method.

You cannot freeze a Freezable object if any one of the following conditions is true about the object:

• It has animated or data bound properties.

• It has properties that are set by a dynamic resource. For more information about dynamic resources, see the Resources Overview.

• It contains Freezable sub-objects that cannot be frozen.

If these conditions are false for your Freezable object and you do not intend to modify it, consider freezing it to gain performance benefits.

The following example freezes a SolidColorBrush, which is a type of Freezable object.

Button myButton = new Button();
SolidColorBrush myBrush = new SolidColorBrush(Colors.Yellow);          

if (myBrush.CanFreeze)
{
    // Makes the brush unmodifiable.
    myBrush.Freeze();
}

myButton.Background = myBrush;  

For more information about Freezable objects, see the Freezable Objects Overview.

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

.NET Framework

Reference