icommand

How can I cancel exiting from particular form after Cancel button (or X at the top right corner, or Esc) was clicked? WPF: <Window ... x:Class="MyApp.MyView" ... /> <Button Content="Cancel" Command="{Binding CancelCommand}" IsCancel="True"/> </Window> ViewModel: public class MyViewModel : Screen { private CancelCommand cancelCommand; public CancelCommand CancelCommand { get { return cancelCommand; } } public MyViewModel() { cancelCommand = new CancelCommand(this); } } public class CancelCommand : ICommand { public CancelCommand(MyViewModel viewModel) { this.viewModel = viewModel; } public

I have a form with a textbox and a button. When that textbox has it's value changed, the button command doesn't call the CanExecute method of it's command. The command parameter is set but doesn't seem to change. After load the window, the button remains disabled. <TextBox Text="{Binding Name, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" /> <Button Content="Save" Command="{Binding SaveChangesCommand}" CommandParameter="{Binding Name}" /> I know the binding is working because I created a behavior that receives a target binding and raise the CanExecute when the the binding changes. With

I have a canvas, e.g. similar to this solution or many others using the ItemsControl . Now I want a button which should be bound to an ICommand. This command should call a method of ViewModel class which can save the image. The saving method is clear, but how do I do the binding following the MVVM pattern? You could pass the Canvas to the ViewModel's Save method using a CommandParameter <Button Content="Save" Command="{Binding SaveCanvasCommand}" CommandParameter="{Binding ElenementName=myCanvas}" ?> <Canvas x:Name="myCanvas"> <!-- Stuff to save --> </Canvas> And somewhere in you ViewModel or

I am adopting MVVM pattern in WPF and have learned the use of Command . But in my implementation, the delegate I assigned to implement CanExecute is always called. I mean if I put a break point inside the delegate function, it shows that this function keeps getting called. To my understanding (and a natural way of thinking, but of course I can be wrong), this delegate only gets called when I somehow notifies the change of the state and that's when the CommandManager (re)checks the CanExecute property and modify the IsEnabled property of the UI element. Here is my implementation of VB.NET,

I have a tricky problem where I am binding a ContextMenu to a set of ICommand -derived objects, and setting the Command and CommandParameter properties on each MenuItem via a style: <ContextMenu ItemsSource="{Binding Source={x:Static OrangeNote:Note.MultiCommands}}"> <ContextMenu.Resources> <Style TargetType="MenuItem"> <Setter Property="Header" Value="{Binding Path=Title}" /> <Setter Property="Command" Value="{Binding}" /> <Setter Property="CommandParameter" Value="{Binding Source={x:Static OrangeNote:App.Screen}, Path=SelectedNotes}" /> ... However, while ICommand.Execute( object ) gets