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The “base” value is always passed into the Coerce Value Callback and the value returned from that method becomes the new “effective” value.In the case of the Minimum and Maximum example, if the “base” value of the Maximum property is less than the Minimum value, then the “effective” value of the Maximum property becomes equal to the Minimum value.As evidence of this, note that the pseudo-coercion within Silverlight’s native Slider control is just wrong.The Minimum property coerces the Value property upward, but does not coerce it back down correctly (and it’s likewise wrong for the Maximum property). To support value coercion in a consistent manner across your Silverlight classes, you can leverage my Framework Property Metadata class and the related Silverlight Coercion Helper class.This is done by combining the desired flags using a bitwise “OR” and then passing that value into the appropriate Dependency Property. As an example, the Width property on Framework Element is registered with the Affects Measure option.
The Affects Arrange flag will cause Invalidate Arrange() to be called on the target element when the property changes.
Specifically, these are the options used with dependency properties that affect layout. If you are not familiar with these metadata options, here’s a quick rundown…
In WPF, a dependency property on a framework element can be registered with one or more metadata options.
As such, you typically register a Property Changed Callback on the property and then explicitly call Invalidate Measure() and/or Invalidate Arrange() within your callback.
If you use my snippets, you can follow the exact same approach in Silverlight that you would use in WPF for properties that affect layout.