Windows Diary

Didelegcommand.canexecutechanged Memory Leak Problems?

Posted on by William Vaux

 

If you get a “delegatecommand.canexecutechanged Memory Leak” error, this blog post should help.

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    • I recently completed work on desktop applications written in WPF and C # using MVVM patterns. In this mobile app, I used the Delegate Command implementation to wrap the ICommands properties presented in my ModelView. The problem is that these DelegateCommands prevent some ModelViews from being unnecessary after the view is closed. So it stays hidden until I cancel the entire form submission. I am profiling the application I am meeting with.How can I avoid this kind of situation and is it internally related to the mvvm template or is it a template implantation ?. Thanks.

    delegatecommand.canexecutechanged memory leak

    Edit: This is a small but successful but complete part of my partner’s MVVM implementation

    delegatecommand.canexecutechanged memory leak

      DelegateCommand class: ICommand    complete publpersonal action ;    private predicate  canExcute;    public DelegateCommand (Action  does the job, Predicate  canExecute)            if it is (run == null)                    throw a new exception ArgumentNullException ("execute");                this.execute is equivalent to Execute;        this.canExcute CanExecute; =    public bool CanExecute (object parameter)            provided (this.canExcute! = null)                    use canExcute (parameter) again;                returns true;        public event EventHandler CanExecuteChanged            add more CommandManager.RequerySuggested + = value;        subtract CommandManager.RequerySuggested - = value;        public Execute (parameter empty parameters)            this.execute (parameter);     

    delegatecommand.canexecutechanged memory leak
    

      public class ViewModel: DependencyObject, INotifyPropertyChanged   Private DelegateCommand printCommand;    Public ICommand PrintCommand            will                    as if (printCommand == null)                            printCommand = new DelegateCommand (Print, CanExecutePrint);                        return printCommand;                Print area (object-object)            Console.WriteLine ("Print Order");        bool CanExecutePrint (obj object)            returns true;        PropertyChangedEventHandler PropertyChanged public event    private void OnProeprtyChanged (string propertyName)            if (PropertyChanged! iszero)                    PropertyChanged (this, the new PropertyChangedEventArgs (property_name));             
    

      public MainWindow ()            Initialize component ();       Base .DataContext = new ViewModel ();    
    

              
    

     
    

     
    
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