How to update list on one window when some event trigger on another window in WPF

Question

How to update list on one window when some event trigger on another window in WPF. i just want to know how to listen to the event of one window from another window.

Answer 1

You'll have to pass the object to the new window and then create a new event handler for it on the second window.

First Window Code:

public FirstWindow()
{
    InitializeComponent();
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    SecondWindow sWindow = new SecondWindow(btnFirstWindow);
    sWindow.Show();
}

Second Window Code:

private Button firstWindowButton;
public SecondWindow(Button firstWindowButton)
{
    this.firstWindowButton = firstWindowButton;

    InitializeComponent();
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    firstWindowButton.Click += firstWindowButton_Click;
}

void firstWindowButton_Click(object sender, RoutedEventArgs e)
{
    lblShowUser.Content = "First window button clicked on: " + DateTime.Now.ToString();
}

I've added a list to the first window and events on the second window for you:

Here is the first windows code:

public FirstWindow()
{
    InitializeComponent();
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    String[] items = { "Item 1", "Item 2", "Item 3" };
    listItems.ItemsSource = items;

    SecondWindow sWindow = new SecondWindow(btnFirstWindow, listItems);
    sWindow.Show();
}

Second windows code:

private Button firstWindowButton;
private ListBox firstWindowListBox;

public SecondWindow(Button firstWindowButton, ListBox firstWindowListBox)
{
    this.firstWindowButton = firstWindowButton;
    this.firstWindowListBox = firstWindowListBox;
    InitializeComponent();
}

private void Window_Loaded(object sender, RoutedEventArgs e)
{
    firstWindowButton.Click += firstWindowButton_Click;
    firstWindowListBox.MouseDoubleClick += firstWindowListBox_MouseDoubleClick;
}

void firstWindowListBox_MouseDoubleClick(object sender, MouseButtonEventArgs e)
{
    if (firstWindowListBox.SelectedItem != null)
    {
        lblShowUser.Content = "First window list box selected item: " + firstWindowListBox.SelectedItem.ToString();
    }
}

void firstWindowButton_Click(object sender, RoutedEventArgs e)
{
    lblShowUser.Content = "First window button clicked on: " + DateTime.Now.ToString();
}