如何在Wpf中的Usercontrol中调用MahApps Metro对话框

Question

当我尝试调用MahApps Metro对话框时，传递值时出现错误

在传递参数时调用对话框控件时，我需要传递Metrowindow参数

但是我需要在用户控件中调用它

下面是我需要对话框控制时将调用的方法

public async void ShowMessageDialog(object sender, RoutedEventArgs e)
        {
            // This demo runs on .Net 4.0, but we're using the Microsoft.Bcl.Async package so we have async/await support
            // The package is only used by the demo and not a dependency of the library!
            var mySettings = new MetroDialogSettings()
            {
                AffirmativeButtonText = "Hi",
                NegativeButtonText = "Go away!",
                FirstAuxiliaryButtonText = "Cancel",
               // ColorScheme = MetroDialogOptions.ColorScheme
            };

            MessageDialogResult result = await this.ShowMessageAsync("Hello!", "Welcome to the world of metro!",
                MessageDialogStyle.AffirmativeAndNegativeAndSingleAuxiliary, mySettings);

            if (result != MessageDialogResult.FirstAuxiliary)
                await this.ShowMessageAsync("Result", "You said: " + (result == MessageDialogResult.Affirmative ? mySettings.AffirmativeButtonText : mySettings.NegativeButtonText +
                    Environment.NewLine + Environment.NewLine + "This dialog will follow the Use Accent setting."));
        }

public static Task<MessageDialogResult> ShowMessageAsync(this MetroWindow window, string title, string message, MessageDialogStyle style = MessageDialogStyle.Affirmative, MetroDialogSettings settings = null)
        {
            window.Dispatcher.VerifyAccess();
            return HandleOverlayOnShow(settings, window).ContinueWith(z =>
            {
                return (Task<MessageDialogResult>)window.Dispatcher.Invoke(new Func<Task<MessageDialogResult>>(() =>
                {
                    if (settings == null)
                    {
                        settings = window.MetroDialogOptions;
                    }

                    //create the dialog control
                    var dialog = new MessageDialog(window, settings)
                    {
                        Message = message,
                        Title = title,
                        ButtonStyle = style
                    };

                    SizeChangedEventHandler sizeHandler = SetupAndOpenDialog(window, dialog);
                    dialog.SizeChangedHandler = sizeHandler;

                    return dialog.WaitForLoadAsync().ContinueWith(x =>
                    {
                        if (DialogOpened != null)
                        {
                            window.Dispatcher.BeginInvoke(new Action(() => DialogOpened(window, new DialogStateChangedEventArgs())));
                        }

                        return dialog.WaitForButtonPressAsync().ContinueWith(y =>
                        {
                            //once a button as been clicked, begin removing the dialog.

                            dialog.OnClose();

                            if (DialogClosed != null)
                            {
                                window.Dispatcher.BeginInvoke(new Action(() => DialogClosed(window, new DialogStateChangedEventArgs())));
                            }

                            Task closingTask = (Task)window.Dispatcher.Invoke(new Func<Task>(() => dialog._WaitForCloseAsync()));
                            return closingTask.ContinueWith(a =>
                            {
                                return ((Task)window.Dispatcher.Invoke(new Func<Task>(() =>
                                {
                                    window.SizeChanged -= sizeHandler;

                                    window.RemoveDialog(dialog);

                                    return HandleOverlayOnHide(settings, window);
                                }))).ContinueWith(y3 => y).Unwrap();
                            });
                        }).Unwrap();
                    }).Unwrap().Unwrap();
                }));
            }).Unwrap();
        }

Answer 1

ShowMessageAsync是MetroWindow的扩展方法，因此此代码应该有效：

var metroWindow = (Application.Current.MainWindow as MetroWindow); 
await metroWindow.ShowMessageAsync(title, message);