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I’d like to highlight one more feature that is available in Silverlight if you use my code snippets.Those who watched the value coercion video might have glimpsed the following enum within the Framework Property code file: This enum provides a limited subset of the metadata options that are available in WPF.

Whenever the Maximum property value changes, it is passed through this coercion function.

If the Maximum value happens to be less than the Minimum value, the function will coerce it to be equal to the Minimum value so that it is valid.

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.

There are several metadata options in WPF that are not included in my Silverlight enum.

These are intentionally excluded because they either cannot be supported outside the native Silverlight framework (e.g., the property engine would need to be modified to support the Not Data Bindable option) or they simply don’t make sense in Silverlight (e.g., Silverlight does not currently support direct rendering via an On Render() override, so I don’t provide an Affects Render flag). WPF My latest snippets package adds value coercion support to Silverlight dependency properties.The other layout options work pretty much the same way.The Affects Arrange flag will cause Invalidate Arrange() to be called on the target element when the property changes.The property changed callback for the Minimum property looks similar to this: Notice that changes to the Minimum property also result in coercion of the Slider’s Value property.That’s because the Value property also needs to stay valid.Value coercion is used to prevent this invalid state from occuring.

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