Manual data binding update in WPF MVVM

Question

My ViewModel:

class ViewModel
{
public string FileName {get;set;}
}

and in mine ViewI bind the contents of the label to the ViewModel FileName.

now When I drag a file into my view, how can I update the label property Contentso that the ViewMode is FileNamealso updated via the binding?

Directly setting the label property Contentwill not work, just just clear the binding.

Answer 1

3 quick choices ... (make sure the class implements INotifyPropertyChanged, and FileName is an event.)

• You can simply pull the VM out of the View DataContext, and set the FileName property to the ViewModel during the Drag-and-Drop event.

• AttachedBehavior, Event (Drag-and-Drop) Command (http://geekswithblogs.net/HouseOfBilz/archive/2009/08/27/adventures-in-mvvm-ndash-binding-commands-to-any-event.aspx)

• Messenger, MVVMLight Messenger, ViewModel , .