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Changed Event
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Freezable.Changed Event

Occurs when the Freezable or an object it contains is modified.

Namespace:  System.Windows
Assembly:  WindowsBase (in WindowsBase.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

public event EventHandler Changed
<object Changed="EventHandler" .../>

If you attempt to add or remove event handlers when the current object is not modifiable (when the IsFrozen property is true), an exception is thrown.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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