Data binding manually update in WPF MVVM
binding, drag-and-drop, mvvm
Solution
3 quick choices... (Make sure the class implements INotifyPropertyChanged, and FileName is raising this event.)
You can simply pull the VM out of the View's DataContext and during the Drag-and-Drop event set the FileName property of the ViewModel.
Use an AttachedBehavior to allow the Event (Drag-and-Drop) to be used like a Command (Link)
Use a Messenger pattern, like MVVMLight's Messenger, to send a Message from the View to the ViewModel and handle the Message on the VM like you would a Command Action.
Problem
My ViewModel: ``` class ViewModel { public string FileName {get;set;} } ``` and in my `View` I bind a label's content to ViewModel's `FileName`. now When I do drag-drop a file to my View, How can I update the label's `Content` property, so that the ViewMode's `FileName` also get updated via binding? Directly set the label's `Content` property won't work, it just simply clear the binding.