Add a reference to the assembly System.Windows.Interactivity then declare it in XAML as xmlns:i=”clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity” or use it if you have Blend SDK installed xmlns:i=”http://schemas.microsoft.com/expression/2010/interactivity” and use it in XAML as <i:Interaction.Triggers> <i:EventTrigger> </i:EventTrigger> </i:Interaction.Triggers>
I just want to reiterate a solution that Bradley Uffner mentioned buried in the comments above. Close Visual Studio Delete the hidden .vs folder Open Visual Studio and rebuild your project Keep in mind that this is a very generic error that has multiple causes and solutions, so this may not work for you, but … Read more
For future stumblers on this question, this page is what ultimately worked for me: http://blog.alner.net/archive/2010/04/25/cancelling-selection-change-in-a-bound-wpf-combo-box.aspx It’s for a combobox, but works for a listbox just fine, since in MVVM you don’t really care what type of control is calling the setter. The glorious secret, as the author mentions, is to actually change the underlying value … Read more
Unfortunately, only ButtonBase derived controls have the possibility for binding ICommand objects to their Command properties (for the Click event). However, you can use an API provided by Blend to map an event (like in your case MouseDoubleClick on the ListBox) to an ICommand object. <ListBox> <i:Interaction.Triggers> <i:EventTrigger EventName=”MouseDoubleClick”> <i:InvokeCommandAction Command=”{Binding YourCommand}”/> </i:EventTrigger> </i:Interaction.Triggers> </ListBox> … Read more
Isak’s answer did not work for me, because it did not solve the problem of how to act when the actual wait is over for the user. I ended up doing this: Everytime I start doing something timeconsuming, I call a helper-method. This helper method changes the cursor and then creates a DispatcherTimer that will … Read more
I’ve written a framework that represents my explorations in this question called ReactiveUI It implements both an Observable ICommand, as well as ViewModel objects who signal changes via an IObservable, as well as the ability to “assign” an IObservable to a property, who will then fire INotifyPropertyChange whenever its IObservable changes. It also encapsulates a … Read more
You are calling secVMFactory outside of your FirstViewModel constructor so by that time the ResolveOperation is disposed and in your factory method the c.Resolve will throw the exception. Luckily the exception message is very descriptive and telling you what to do: When registering components using lambdas, the IComponentContext ‘c’ parameter to the lambda cannot be … Read more
@lhildebrandt’s answer is generally right, but in my case this solution produces errors that totally disable displaying the view in designer. Specifying <d:Style.DataContext> inside <Style> tag helped me. <Style> <d:Style.DataContext> <x:Type Type=”local:MyTreeItem” /> </d:Style.DataContext> <!–usual setters, triggers, etc.–> </Style> In this way d:DataContext can also be specified for controls, and we can provide it interfaces, … Read more