How to call MahApps Metro Dialog box in Usercontrol in Wpf

问题:

When I tried to call MahApps Metro Dialog Boxes I am getting error while Passing Values

while calling Dialog Control when Passing parameters I need to pass Metrowindow parameter

But I need to call it in User control

Below is the Method I will call when I need Dialog control

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();         } 

回答1:

ShowMessageAsync is an extension method for MetroWindow, so this code should work:

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

回答2:

Let me give you a reallife example based on Rajesh answer.

 async void LoadData()         {             var metroWindow = (Application.Current.MainWindow as MetroWindow);             var controller = await metroWindow.ShowProgressAsync("Procesando", "Obtener datos de la base de datos",                  false, new MetroDialogSettings() { AnimateShow = true, ColorScheme = MetroDialogColorScheme.Theme});             controller.SetIndeterminate();              await viewModel.LoadData();              await Dispatcher.BeginInvoke((Action)(async () =>              {                  DataGrid1.ItemsSource = viewModel.AModels;                   await controller.CloseAsync();              }));         } 

回答3:

@Rajesh code does null exception for me inside usercontrol. Even though my MainWindow is a MetroWindow class. However, the below worked for my configuration;

        #region try show Message         try         {              #region ok, lets show message             foreach (System.Windows.Window window in System.Windows.Application.Current.Windows)             {                 if (window.GetType() == typeof(MainWindow))                 {                      var controller = await (window as MainWindow).ShowProgressAsync("My Title", "My long message content text.",                     false, new MetroDialogSettings() { AnimateShow = true, ColorScheme = MetroDialogColorScheme.Theme });                  }             }             #endregion ok, lets show message          }         catch (Exception ex)         {              #region error block               #endregion error block          }         #endregion try show Message 

回答4:

This is a another option because i was try with Rajesh Akshith answer but it is not work for me.

In usercontrol,

using MahApps.Metro.Controls.Dialogs;  private IDialogCoordinator dialogCoordinator; public async Task ShowMessageAsync()         {             dialogCoordinator = DialogCoordinator.Instance;             await dialogCoordinator.ShowMessageAsync(this,"Header","Body");         } 

I was reference from Mahapps Dialog .I think this was more useful and It also can write in helper class and you can call this from anywhere.

文章来源: How to call MahApps Metro Dialog box in Usercontrol in Wpf