Realize the mutual value transfer between main window and sub window in WPF

In the use of WPF When , We often use the transfer of values between forms , The following example transfers values from the main window to the sub window , The method of transferring values from the sub window to the main window .

One 、 The main window transfers values to the sub window

The main method of transferring values from the main window to the sub window is to create a variable in the sub window to receive the values of the main window , Then realize the value transmission .

In the main window Xaml Code ：

<Grid>
    <TextBox x:Name="tb_message" HorizontalAlignment="Left" Height="35" Margin="232,80,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Width="360" FontSize="16"/>
    <Button Content=" Pass values to subform " FontSize="20" HorizontalAlignment="Left" Margin="342,179,0,0" VerticalAlignment="Top" Width="124" Height="34" Click="Button_Click"/>
</Grid>

View ：

Main window background code ：

public partial class MainWindow : Window
{
   public MainWindow()
   {
       InitializeComponent();
   }
   private void Button_Click(object sender, RoutedEventArgs e)
   {
        child_window child_Window = new child_window();
        child_Window.test_str = tb_message.Text;
        child_Window.Show();
        this.Close();
    }
}

Of a child window Xaml Code ：

<Grid>
    <TextBlock x:Name="tb_receive" HorizontalAlignment="Left" Margin="249,75,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Height="29" Width="316"/>
    <Button Content=" Receive the value from the main window ：" FontSize="15" HorizontalAlignment="Left" Margin="319,168,0,0" VerticalAlignment="Top" Width="189" Height="29" Click="Button_Click"/>
</Grid>

View ：

Sub window background code ：

public partial class child_window : Window
{
   public string test_str { get; set; }
   public child_window()
   {
      InitializeComponent();
   } 
   private void Button_Click(object sender, RoutedEventArgs e)
   {
      tb_receive.Text = test_str;
   }
}

Demonstration of value transfer effect from main window to sub window ：

 

Two 、 The sub window transfers values to the main window

The transfer of values from the sub form to the main form is mainly executed through delegation .

Of the main form Xaml Code ：

<Grid>
    <Button Content=" Open sub window ：" FontSize="15" HorizontalAlignment="Left" Margin="43,78,0,0" VerticalAlignment="Top" Width="287" Height="39" RenderTransformOrigin="0.5,0.5" Click="Button_Click"></Button>
    <TextBlock x:Name="tb_recevie" HorizontalAlignment="Left" Margin="395,78,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Height="39" Width="349"/>
</Grid>

View ：

Main window background code ：

public partial class MainWindow : Window
{
   public MainWindow()
   {
      InitializeComponent();
   }
   public void Recevie(string value)
   {
       tb_recevie.Text = value;
   }
    private void Button_Click(object sender, RoutedEventArgs e)
    {
       child_window child_Window = new child_window();
       child_Window.sendMessage = Recevie;
       child_Window.Show();
    }
}

Of a child window Xaml Code ：

<Grid>
     <TextBox x:Name="tb_send" HorizontalAlignment="Left" Height="33" Margin="230,101,0,0" TextWrapping="Wrap" Text="TextBox" VerticalAlignment="Top" Width="329"/>
     <Button Content=" Pass values to the main form " FontSize="15" HorizontalAlignment="Left" Margin="317,181,0,0" VerticalAlignment="Top" Width="164" Height="27" Click="Button_Click"/>
</Grid>

View ：

Sub window background code ：

public partial class child_window : Window
{
   public delegate void SendMessage(string value);
   public SendMessage sendMessage;
   public child_window()
   {
      InitializeComponent();
   }
   private void Button_Click(object sender, RoutedEventArgs e)
   {
      sendMessage(tb_send.Text);
   }
}

Demonstration of value transfer effect from sub window to main window ：