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How to: Make a Freezable Read-Only

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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 XAML Resources.

  • 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.

Example

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;

Dim myButton As New Button()
Dim myBrush As New SolidColorBrush(Colors.Yellow)

If myBrush.CanFreeze Then
    ' Makes the brush unmodifiable.
    myBrush.Freeze()
End If

myButton.Background = myBrush

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

See also