Is there another way to access MainWindow's public variables than :
MainWindow mainWindow = Application.Current.Windows.OfType<MainWindow>().FirstOrDefault();
mainWindow.variable....
this work fine, but I'm creating a WPF application and integrating a USB Webcam to my project and using this code above to access MainWindow's variables. This causes some problems like program is still running when I close MainWindow and camera won't stop.
Any suggestions?
This is an over simplified example for what i wrote in comments(you really should look at mvvm the example below is not mvvm).
public class SelectedIndexData
{
public int SelectedIndex { get; set; }
}
public partial class MainWindow : Window
{
private readonly SelectedIndexData _selectedIndexData = new SelectedIndexData();
public MainWindow()
{
InitializeComponent();
}
private void ComboBox_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
_selectedIndexData.SelectedIndex = ComboBox.SelectedIndex;
}
private void ShowChildWindow(object sender, RoutedEventArgs e)
{
new ChildWindow(_selectedIndexData).Show();
}
}
public partial class ChildWindow : Window
{
private SelectedIndexData _selectedIndexData;
public ChildWindow(SelectedIndexData selectedIndexData)
{
InitializeComponent();
_selectedIndexData = selectedIndexData; // do whatever you want with your data here
}
}
This approach work also if you are developing a dll (you can't tell the same about Application.Current.MainWindow, which is clearer then your attempt anyways)
DependencyObject ucParent = this.Parent;
while (!(ucParent is MainWindow))
{
ucParent = LogicalTreeHelper.GetParent(ucParent);
}
mainview = ucParent as MainWindow;
You can pack this inside a method, save the variables that you need and you shouldn't have problems
To make sure you application shuts down when MainWindow is closed:
public MainWindow()
{
InitializeComponent();
this.Closing += (sender, args) => Application.Current.Shutdown();
}
