How to: Obtain a Writable Copy of a Read-Only Freezable

This example shows how to use the Clone method to create a writable copy of a read-only Freezable.

After a Freezable object is marked as read-only ("frozen"), you cannot modify it. However, you can use the Clone method to create a modifiable clone of the frozen object.

The following example creates a modifiable clone of a frozen SolidColorBrush object.

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

// Freezing a Freezable before it provides 
// performance improvements if you don't 
// intend on modifying it.  
if (myBrush.CanFreeze)
{
    // Makes the brush unmodifiable.
    myBrush.Freeze();
}


myButton.Background = myBrush;  

// If you need to modify a frozen brush, 
// the Clone method can be used to 
// create a modifiable copy.
SolidColorBrush myBrushClone = myBrush.Clone();

// Changing myBrushClone does not change 
// the color of myButton, because its 
// background is still set by myBrush.
myBrushClone.Color = Colors.Red;

// Replacing myBrush with myBrushClone 
// makes the button change to red.
myButton.Background = myBrushClone;

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

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