Vista - DependencyObject.GetValue() and GetValueBase() - Building customcontrols.

Does anyone know if the method DependencyObject.GetValueBase() has been
removed? I can't find it anywhere in the MSDN documentation for this
class. What are we supposed to replace it with?

In any of the code I've seen that is building custom controls, they
sometimes use GetValue() and GetValueBase() without really specifying
what the difference was between the two. Now without any documentation,
I can't even learn the difference for myself!

Thanks guys, any comments would be appreciated.

Jason

The split between GetValue and GetValueBase are leftovers from the older
property system design where implementers of a DP were supposed to do their
own property value caching algorithm.

Under the old system, GetValue might return the cached value, but
GetValueBase would be sure to always call into the DP around the caching, and
was used to get values from within the get{} CLR property implementation that
performed caching.

However the current property system design has dropped the DP-owner-centric
caching, and instead the property system itself does a better job of
returning effective values. Also, on the Set side, only raises *Changed
events if the effective value really did change.

For your purposes, whatever might have used to call GetValueBase can just
call GetValue and obtain the same result.

If you want to look at some dirty laundry and see how this used to be you
can still look at the "windowssdk" version of the docs online, which is
frozen for now at the Beta1 version. e.g.:
http://windowssdk.msdn.microsoft.com...1_0bab04f6.asp
[note that it's possible that site may refresh to be more modern at any time]

"Jason Dolinger" wrote:

> Does anyone know if the method DependencyObject.GetValueBase() has been
> removed? I can't find it anywhere in the MSDN documentation for this
> class. What are we supposed to replace it with?
>
> In any of the code I've seen that is building custom controls, they
> sometimes use GetValue() and GetValueBase() without really specifying
> what the difference was between the two. Now without any documentation,
> I can't even learn the difference for myself!
>
> Thanks guys, any comments would be appreciated.
>
> Jason
>