Wpf binding not updating when source changes

This is tidier in my opinion than the if(Property Changed ! We get a strange new requirement that every second change should be ignored.(The actual business requirement was more sensible. If the previous entity wasn’t saved, the user would be presented with a save dialog and standard “yes/no/cancel” options.It can be very difficult then to bind a property on those elements…

wpf binding not updating when source changes-82wpf binding not updating when source changes-86wpf binding not updating when source changes-32

This indicates to the binding that we’re only going to be updating the binding target (the Combo Box’s Items collection in this case).

Binding Expression: Path=Show Price; Data Item=null; target element is ‘Data Grid Text Column’ (Hash Code=32685253); target property is ‘Visibility’ (type ‘Visibility’) But none of these workarounds seems to work, we always get the same result…

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…

User controls are a great way couple logic and XAML in an encapsulated way. A user control contrasts with a custom control in that a custom control contains no XAML. And though it says you may safely continue, it doesn’t continue safely at all. It means the binding target isn’t a dependency property!

You can reuse a user control over and over and the logic is isolated from the general flow of your program. Custom control can be (and is sometimes are required to be) templated (for example, a Data Template). This is confusing to XAML developers because they are accustomed to binding to CLR properties that implement INotify Property Changed in their view models. A data binding source source CAN be a CLR-type property.

418

Leave a Reply