Cancel opening dialog in dialog view model

Question

I use Prism 7.2.0. I wonder if it is possible to cancel opening dialog in a view model, which implements IDialogAware in case of invalid parameters. I tried the

Answer 1

I don't have a sufficient reputation to add a comment. The solution from thatguy is good, but I've made some changes for memory optimization.

I've switched the ConfigureDialogWindowContent and ConfigureDialogWindowEvents methods, because I don't want to have the events registered.

The check itself I've moved to ConfigureDialogWindowContent method. If It not passed, I return ButtonResult.Abort.

My validation Interface is called IDialogAwareEx, but can be changed for IDialogParametersValidator from thatguy post

 void ShowDialogInternal(string name, IDialogParameters parameters, Action callback, bool isModal, string windowName = null)
    {
        IDialogWindow dialogWindow = CreateDialogWindow(windowName);
        if (!ConfigureDialogWindowContent(name, dialogWindow, parameters))
        {
            callback?.Invoke(new DialogResult(ButtonResult.Abort));
            return;
        }
        ConfigureDialogWindowEvents(dialogWindow, callback);

        if (isModal)
            dialogWindow.ShowDialog();
        else
            dialogWindow.Show();

    }

 protected virtual bool ConfigureDialogWindowContent(string dialogName, IDialogWindow window, IDialogParameters parameters)
    {
        var content = _containerExtension.Resolve