The default value (as set by the FrameworkPropertyMetadata object)
2. The inherited value (if the FrameworkPropertyMetadata.Inherits flag is set and a value
has been applied to an element somewhere up the containment hierarchy)
3. The value from a theme style (as discussed in Chapter 15)
4. The value from a project style (as discussed in Chapter 12)
5. The local value (in other words, a value you??™ve set directly on this object using code
or XAML)
As this list shows, you override the entire hierarchy by applying a value directly. If you
don??™t, the value is determined by the next applicable item up on the list.
nNote One of the advantages of this system is that it??™s very economical. If the value of a property has not
been set locally, WPF will retrieve its value from a style, another element, or the default. In this case, no
memory is required to store the value. You can quickly see the savings if you add a few buttons to a form.
Each button has dozens of properties which, if they are set through one of these mechanisms, use no
memory at all.
CHAPTER 6 n DEPENDENCY PROPERTIES AND ROUTED EVENTS 150
WPF follows the previous list to determine the base value of a dependency property. However,
the base value is not necessarily the final value that you??™ll retrieve from a property. That??™s
because WPF considers several other providers that can change a property??™s value.
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