Fire event in page from mainwindow

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I have a Window that hosts a Page. I want to fire an event on the Page when the user clicks cancel when closing the MainWindow. At the moment I am struggling to work out how to fire the event on the Page from Window. Here is the event on the Page;

C#

public void OnChangeUserEvent()
{
    var _employeeSelectionWindow = new EmployeeSelectionWindow();
    _employeeSelectionWindow.ReturnEmployeeDetails += LoadSelectedEmployeeAsLoggedInUser;
    _employeeSelectionWindow.ShowDialog();
}

And here is when I would like to fire it (this method is in a Window, hosting the page);

C#

private void OnWindowClosed(object sender, System.ComponentModel.CancelEventArgs e)
{
    var result = MessageBox.Show(@"Are you sure you want to exit the database?" + Environment.NewLine + "Click cancel to change user.",
                                "", MessageBoxButton.YesNoCancel);
    if (result == MessageBoxResult.Yes)
    {
        Environment.Exit(0);
    }
    else if (result == MessageBoxResult.Cancel)
    {
        //Fire the event on the page here!
        e.Cancel = true;
    }
    else
    {
        e.Cancel = true;
    }
}

What I have tried:

I've tried using something like;

C#

((LoginPage)e.Content).UserChangeEvent+= new EventHandler(MainWindow_NewRecordSaved);

nothing has worked for me so far.

Posted 4-Sep-16 22:53pm

DRD94

Updated 5-Sep-16 0:30am

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njammy · Accepted Answer · 2016-09-05T00:30:00

Try this following sample:

Main window markup

XML

<Window x:Class="WpfApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Button x:Name="ShowPageButton" Content="Show Page" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="75" Click="ShowPageButton_Click"/>
        <Frame x:Name="frame" Content="Frame" HorizontalAlignment="Left" Height="247" Margin="10,37,0,0" VerticalAlignment="Top" Width="507"/>
        <Button x:Name="CancelButton" Content="Cancel" HorizontalAlignment="Left" Margin="414,300,0,0" VerticalAlignment="Top" Width="76" Click="CancelButton_Click"/>
    </Grid>
</Window>

Main window Code

C#

public partial class MainWindow : Window
    {
        private Page1.OnMainWindowEvent CancelEvent;
        private Page1 page1;

        public MainWindow()
        {
            InitializeComponent();
        }

        private void ShowPageButton_Click(object sender, RoutedEventArgs e)
        {
            CancelEvent = new Page1.OnMainWindowEvent(OnCancelClicked);
            page1 = new Page1();
            page1.RegisterMainWindowEvent(CancelEvent);
            frame.Content = page1;
        }

        private void CancelButton_Click(object sender, RoutedEventArgs e)
        {
            OnCancelClicked("Cancel clicked on main window.");
        }

        private void OnCancelClicked(string message)
        {
            page1.DoSomething(message);
        }
    }

Page1 markup

XML

<Page x:Class="WpfApp.Page1"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:WpfApp"
      mc:Ignorable="d" 
      d:DesignHeight="300" d:DesignWidth="300"
      Title="Page1">

    <Grid>
        <Label x:Name="label" Content="Hi I am Page1" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top"/>

    </Grid>
</Page>

Page1 code

C#

public partial class Page1 : Page
    {
        public delegate void OnMainWindowEvent(string eventName);
        private event OnMainWindowEvent MainWindowEvent;

        public Page1()
        {
            InitializeComponent();
        }

        public void RegisterMainWindowEvent(OnMainWindowEvent eventHandler)
        {
            MainWindowEvent = eventHandler;
        }

        public void DoSomething(string someMessage)
        {
            MessageBox.Show(someMessage);
            label.Content = someMessage;
        }
    }