How to call MahApps Metro Dialog box in Usercontrol in Wpf - wpf

Question

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();
}

Answer 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);

Answer 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();
}));
}

Answer 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

Answer 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.

Answer 5

In my MainWindow:
public async void ShowMessagesDialog(string title, string message)
{
logger.Add("ShowMessagesDialog: " + message);
var messageDialogSettings = new MetroDialogSettings
{
AffirmativeButtonText = "Aceptar",
OwnerCanCloseWithDialog = false,
ColorScheme = this.MetroDialogOptions.ColorScheme,
};
await this.ShowMessageAsync(title, message, MessageDialogStyle.Affirmative, messageDialogSettings);
}
In my UserControl:
(Application.Current.MainWindow as MainWindow).ShowMessagesDialog("Información", "No ha seleccionado un archivo");