It is possible to close Window1 when Window2 is open WPF?

Question

I have an WPF application and I want to close Window1 when Window2 is open from UserControl library.
How to do ?

Answer 1

Hi,@B M-A . Viorel-1's answer is good, I made the example below. Please let me know if there are any questions.

Project structure:

Add reference WpfApp2 for WpfControlLibrary1 :
Right click on the References of WpfControlLibrary1 -> select Add References... -> check WpfApp2 and click OK.

UserControl:

<UserControl x:Class="WpfControlLibrary1.UserControl1"  
         ...  
            >  
    <StackPanel Background="AliceBlue">  
        <Button x:Name="window1" Content="window1" Click="window1_Click" Width="100" Height="40"/>  
        <Button x:Name="window2"  Content="window2" Click="window2_Click" Width="100" Height="40"/>  
  
    </StackPanel>  
</UserControl>  

UserControl.xaml.cs:

 public partial class UserControl1 : UserControl  
    {  
        public UserControl1()  
        {  
            InitializeComponent();  
        }  
        Window2 win2;  
        Window1 win1 ;  
        private void window1_Click(object sender, RoutedEventArgs e)  
        {  
            win1 = new Window1();  
            win1.Show();  
        }  
  
        private void window2_Click(object sender, RoutedEventArgs e)  
        {  
            win2 = new Window2();  
            win2.Show();  
            win1.Close();  
  
        }  
    }  

Add reference WpfControlLibrary1 for WpfApp3 :

Right click on the References of WpfApp3->select Add References...->check WpfControlLibrary1 and click OK.

<Window x:Class="WpfApp3.MainWindow"  
         
  
       >  
    <Grid>  
        <uc:UserControl1 Width="300" Height="160"/>  
    </Grid>  
</Window>  

The result:

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Answer 2

After displaying the Window2 in your User Control, try executing these lines:

Window w1 = Window.GetWindow( this );  
w1.Close( );  

This assumes that the User Control is inside Window1.