How to prevent CommandManager from invoking CanExecute whenever there is UI interaction?
A solution might be to implement a simpler version of the RelayCommand class that simply stores the event handlers itself and exposes a public method to fire them when appropriate: public class RelayCommand : ICommand { public event EventHandler CanExecuteChanged; // Further ICommand implementation omitted... public void Invalidate() { var...
Invoking command on TextChange is not updating Text Source Immediately
mvvm-light,windows-phone-8.1,relaycommand,commandbinding
OK, so based on the comments, here's the answer - don't use the InvokeCommandAction but the two-way binding. <TextBox Text="{Binding SearchText, Mode=TwoWay,UpdateSourceTrigger=PropertyChanged}" /> In the viewmodel behind this, there's a property called SearchText which has a setter that can call the LoadContents method, something like this... public string SearchText {...
WPF - Pass parameter to relaycommand within ItemsControl
c#,wpf,xaml,itemscontrol,relaycommand
Currently, you have the button DataContext set to a string "ChromaGUI.MainWindow" : <Button DataContext="ChromaGUI.MainWindow" ....... Command="{Binding RelativeSource= {RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.SendMessageCommand}" CommandParameter="{Binding FullCommandString}"/> String doesn't have property FullCommandString, so your command parameter binding will fail. Simply remove DataContext setting in the button to make it use default DataContext which...
Is it possible to set e.Handled = true in a RelayCommand?
c#,wpf,mvvm,icommand,relaycommand
I am going to presume you're using MVVM and ideally you want to be able to 'handle' the click of the hyperlink in the ViewModel and not in the View - which is the correct way to do this. In which you are probably best using a normal WPF button...
Weird behavior of canExecute in Mvvmlight RelayCommand
c#,mvvm-light,relaycommand,canexecute
Are you declaring p on the stack in this line and does it still exist when the handler is called? CommandConfirm = new RelayCommand<object>((p) => ConfirmExecute(p), (p) => ConfirmCanExecute(p)); Because an incorrect command binding would certainly cause this to return null, creating the error you're seeing. var passwordBox = parameter...
CanExecute on Relay Command not working
Thanks for your inputs ,I have solved my problem by adding CommandManager.InvalidateRequerySuggested in my relaycommand implementation. [DebuggerStepThrough] public bool CanExecute(object parameter) { bool result = true; if (_canExecute != null) { result = _canExecute(); CommandManager.InvalidateRequerySuggested(); } return result; } ...
How to find out which button I pressed?
c#,wpf,stackpanel,icommand,relaycommand
You should use CommandParameter property of the button by assigning unique identifier of each notification to it. I'm assuming your notification has an unique integer id: //Add a delete button: var del = new Button(); del.Content = "Slet"; del.FontSize = 24; del.Command = DeleteNotificationCommand; del.CommandParameter = notification.Id; // <-- unique...
WPF Multibinding - Need to use Relaycommand
c#,wpf,mvvm,multibinding,relaycommand
you said: However, this wont work when its multivalue This assumption is wrong. It does work! When your multiconverter returns array of values, then this array is passed as a parameter to Command.Execute method. new RelayCommand(EnemyPopupTooltipEx, null); public void EnemyPopupTooltipEx(object parameter){ var values = (object[])parameters; } however, this is very...
Moving from RelayCommand to ReactiveCommand
How about this: var canExecute = this.WhenAny(x => x.kvartal.KanGodkendeBilag, x => x.IsBusy, (bilag, busy) => bilag.Value && !busy.Value); GodkendeBilagCommand = ReactiveCommand.Create(canExecute); ...
WPF command binding with input validation - how to enable the “save” button only if all input is valid
wpf,mvvm,icommand,idataerrorinfo,relaycommand
You haven't really added enough code for us to accurately tell you what your problem is. However, you are taking the correct approach. I also use the IDataErrorInfo interface, but I added some extra properties into my base class that implements it: public string Error // actual IDataErrorInfo Member {...