WPF中實現兩個窗口之間傳值

在使用WPF的時候，我們經常會用到窗體之間傳值，下面示例主窗口傳值到子窗口，子窗口傳值到主窗口的方法。

 

一、主窗口向子窗口傳值

主窗口向子窗口傳值主要方法就是在子窗口建立一個接收主窗口值的變量，然后實現傳值。

主窗口的Xaml：

<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="向子窗體傳值" FontSize="20" HorizontalAlignment="Left" Margin="342,179,0,0" VerticalAlignment="Top" Width="124" Height="34" Click="Button_Click"/>
</Grid>

視圖：

主窗口的后台：

    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();
        }
    }

 

子窗口的Xaml：

    <Grid>
        <TextBlock x:Name="tb_receive" HorizontalAlignment="Left" Margin="339,75,0,0" TextWrapping="Wrap" Text="" VerticalAlignment="Top" Height="29" Width="316"/>
        <Button Content="接收來至主窗口傳來的值：" FontSize="15" HorizontalAlignment="Left" Margin="83,75,0,0" VerticalAlignment="Top" Width="189" Height="29" Click="Button_Click"/>
    </Grid>

視圖：

子窗口后台：

    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;
        }
    }

 

傳值效果圖：

 

 

二、子窗口向主窗口傳值

子窗體向主窗體傳值主要是通過委托來執行的。

主窗體的Xaml：

<Grid>
        <Button Content="打開子窗口：" 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>

視圖：

主窗體的后台：

    public partial class MainWindow : Window
    {
        public void Recevie(string value)
        {
            tb_recevie.Text = value;
        }

        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            child_window child_Window = new child_window();
            child_Window.sendMessage = Recevie;
            child_Window.Show();
        }
    }

 

子窗體的Xaml：

    <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="向主窗體傳值" FontSize="15" HorizontalAlignment="Left" Margin="317,181,0,0" VerticalAlignment="Top" Width="164" Height="27" Click="Button_Click"/>
    </Grid>

視圖：

后台代碼：

    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);
        }
    }