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How to: Determine Whether a Freezable Is Frozen
Visual Studio 2010
This example shows how to determine whether a Freezable object is frozen. If you try to modify a frozen Freezable object, it throws an InvalidOperationException. To avoid throwing this exception, use the IsFrozen property of the Freezable object to determine whether it is frozen.
The following example freezes a SolidColorBrush and then tests it by using the IsFrozen property to determine whether it is frozen.
Button myButton = new Button(); SolidColorBrush myBrush = new SolidColorBrush(Colors.Yellow); if (myBrush.CanFreeze) { // Makes the brush unmodifiable. myBrush.Freeze(); } myButton.Background = myBrush; if (myBrush.IsFrozen) // Evaluates to true. { // If the brush is frozen, create a clone and // modify the clone. SolidColorBrush myBrushClone = myBrush.Clone(); myBrushClone.Color = Colors.Red; myButton.Background = myBrushClone; } else { // If the brush is not frozen, // it can be modified directly. myBrush.Color = Colors.Red; }
For more information about Freezable objects, see the Freezable Objects Overview.
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