WPF Check box Check changed handling

Question

In WPF data binding  I can bind the IsChecked property to some data  e g  user setting  but I need to handle  CheckChanged  event  I know I can seperately handle Checked  Unchecked event  but is there any way to get notified when this value is changed    lt CheckBox Content  Case Sensitive  IsChecked   Binding bSearchCaseSensitive            Source  x Static Properties Settings Default      gt    Note  I don t care if it is checked or unchecked  I just want to be notified when it is changed

User · Answer

That you can handle the checked and unchecked events seperately doesn t mean you have to  If you don t want to follow the MVVM pattern you can simply attach the same handler to both events and you have your change signal    lt CheckBox Checked  CheckBoxChanged  Unchecked  CheckBoxChanged   gt    and in Code-behind   private void CheckBoxChanged object sender  RoutedEventArgs e      MessageBox Show  Eureka  it changed         Please note that WPF strongly encourages the MVVM pattern utilizing INotifyPropertyChanged and or DependencyProperties for a reason  This is something that works  not something I would like to encourage as good programming habit

User · Answer

Im putting this in an answer because it s too long for a comment   If you need the VM to be aware when the CheckBox is changed  you should really bind the CheckBox to the VM  and not a static value   public class ViewModel       private bool  caseSensitive      public bool CaseSensitive               get   return  caseSensitive            set                        caseSensitive   value              NotifyPropertyChange      gt  CaseSensitive                Settings Default bSearchCaseSensitive   value                      XAML    lt CheckBox Content  Case Sensitive  IsChecked   Binding CaseSensitive    gt

User · Answer

A simple and proper way I ve found to Handle Checked Unchecked events using MVVM pattern is the Following  with Caliburn Micro      lt CheckBox IsChecked   Binding IsCheckedBooleanProperty   Content   DynamicResource DisplayContent   cal Message Attach   Event Checked     Action CheckBoxClicked      Event Unchecked     Action CheckBoxClicked       gt    And implement a Method CheckBoxClicked   in the ViewModel  to do stuff you want

User · Answer

I know this is an old question  but how about just binding to Command if using MVVM   ex    lt CheckBox Content  Case Sensitive  Command   Binding bSearchCaseSensitive    gt    For me it triggers on both Check and Uncheck

User · Answer

What about the Checked event  Combine that with AttachedCommandBehaviors or something similar  and a DelegateCommand to get a function fired in your viewmodel everytime that event is called

User · Answer

As a checkbox click   a checkbox change the following will also work    lt CheckBox Click  CheckBox Click    gt    private void CheckBox Click object sender  RoutedEventArgs e               do some stuff     It has the additional advantage of working when IsThreeState  True  whereas just handling Checked and Unchecked does not

[c#] WPF Check box: Check changed handling

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