Making Command 1-time-executable

Question

what is best practice to make a DelegateCommand from Prism framework in MVVM only one time executable in order to prevent click-spamming the button which may result in application crashes. many thanks!

Answer 1

Here is what I normally do:

• You should have a property for what you are deleting. Use CanExecute
• in your delegate command, watch the property if it is null? Use
• ObserveProperty in your DelegateCommand and set it to What you are
• deleting. In your DeleteCommandExecute set the property to null after deleting.

here is an example

    private Class object;
    public Class Object
    {
        get { return object; }
        set { SetProperty(ref object, value); }
    }
    private DelegateCommand _delete;
    public DelegateCommand Delete =>
        _delete ?? (_delete = new DelegateCommand(ExecuteDelete, CanExecuteDelete)).ObservesProperty(()=> Object);

    void ExecuteDelete()
    {
        MyServices.Delete(Object);
        Object = null;
    }

    bool CanExecuteDelete()
    {
        return Object != null;
    }