将一个control freeze后能够提高其性能。
If you try to modify a frozen Freezable object, it throws an 'Invalid Operation' Exception. To avoid throwing this exception, use the "IsFrozen" property of the Freezable object 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;