Wpf usercontrol binding not updating theperilsofcyber dating net
However, in some cases the is not accessible: it happens for elements that are not part of the visual or logical tree.
It can be very difficult then to bind a property on those elements…
This is just as easy, but once you start doing it, you might discover something that disappoints you: Changes are not automatically reflected, like they were in previous examples.
As you will learn in this article, you need just a bit of extra work for this to happen, but fortunately, WPF makes this pretty easy.
It's called Observable Collection, and you use it much like a regular List - that's all it takes!
This will make the Add and Delete button work, but it won't do anything for the "Change name" button, because the change will happen on the bound data object itself and not the source list - the second step will handle that scenario though.
The second step is to let our custom User class implement the INotify Property Changed interface.
At this point, it seems that the only viable approach would be to change the column visibility in code-behind, which we usually prefer to avoid when using the MVVM pattern…
But I’m not going to give up so soon, at least not while there are other options to consider 😉 The solution to our problem is actually quite simple, and takes advantage of the even when they’re not in the visual or logical tree.
The Items Source of the list is assigned to a quick list of a couple of users that we create in the window constructor.