Wpf usercontrol dependency property not updating cugini carnali film 1974 online dating
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.
If you replace Content Presenters with Content Controls, the system works as expected.
property in WPF is extremely handy, because it is automatically inherited by all children of the element where you assign it; therefore you don’t need to set it again on each element you want to bind.
I often get questions about WPF binding behaving differently than people expect in their usage case so here is post to help out with that.
When you bind to properties in WPF with for example: Value=”” the binding update behavior, i.e the trigger for value update, is controlled by the defaults set on the Dependency Property.
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.
For the default view where it would be the full version of the control the mode would be “Full” and for where I was using it as a child control the mode would be “Compact”. After some googling around though the general consensus seemed to be that you should just incorporate this into your new view model. Fortunately my Stack Overflow foo seemed to be working with me and I found the right answer.
The other solution is setting the value of the first member to a positive value, which makes the code work: Now you might think: What’s the difference, the first time it tries to convert –1 to On Off, and the second time it tried to convert 0 to On Off, and it both cases it the value doesn’t exist in the enum.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…Well, if you used Content Presenters in your User Control, you would see this, instead: You would also see strange binding errors in the console System. Data Error: 40 : Binding Expression path error: 'Content Two Template' property not found on 'object' ''String' (Hash Code=-1506748533)'.Binding Expression: Path=Content Two Template; Data Item='String' (Hash Code=-1506748533); target element is 'Content Presenter' (Name=''); target property is 'Content Template' (type 'Data Template') System. Data Error: 40 : Binding Expression path error: 'Content Two Template Selector' property not found on 'object' ''String' (Hash Code=-1506748533)'.