OneWayToSource Binding seems broken in .NET 4.0

Question

OneWayToSource Binding seems broken in .NET 4.0

I have this simple piece of Xaml

Answer 1

Bug, definitely.

if it's a "feature", it's a very bad one...

it seems they have added a call to the get() function after the set() is done, even in the OneWayToSource mode... can anybody explain why ?

also, thanks for pointing this out, it explains an issue I have had since I upgraded my project to .net 4.0 and that I could not explain until now...

just a side note: I have solved this by using dependency properties in the end.