Wpf usercontrol binding not updating
You have to manually bind your dependency property to the property on your view model.It should have been obvious and I’m not sure why I hit on so many wrong answers but here is my solution: Add the dependency property to My View that will bind to the view model This manually sets the binding to a property “View Mode” that is in my view model.The Observable Collection on the other hand is very easy to deal with - it simply requires you to use this specific list type in those situations where you want changes to the source list reflected in a binding destination.UPDATE 07/30/2014: Please be sure to check out the second part to this at Binding a Dependency Property of a View to its View Model, part Deux which contains a working sample solution of the code here.I don’t know the exact mechanism that enables this behavior, but we’re going to take advantage of it to make our binding work…So far in this tutorial, we have mostly created bindings between UI elements and existing classes, but in real life applications, you will obviously be binding to your own data objects.To do this I needed a way to define a “View Mode” of the user control. That much is obvious but that there wasn’t some easy, obvious solution on how to bind a dependency property to a property in the view model.
It's called Observable Collection, and you use it much like a regular List - that's all it takes!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.see order to bind the property, it needs to be a Dependency Property, but not just that!
You also need a control in XAML binding to your property.
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.