WPF:多个窗体之间传值

操作演示:

主窗体:

点击"打开子窗体"按钮打开另一个窗体:

子窗体中输入内容, 点击"将值传向父窗体"

下面放代码:

Main Window.xaml:

Main Window.xaml.cs:

    /// 

    /// MainWindow.xaml 的交互逻辑
    /// 
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        /// 

        /// 点击父窗体上的按钮打开子窗体
        /// 
        /// 
        /// 
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            //实例化一个子窗体
            ChildWindow child = new ChildWindow();
            child.sendMessage += ReceivedMessage;
            child.ShowDialog();
        }

        /// 

        /// 接收值
        /// 
        private void ReceivedMessage(string value)
        {
            ParentTb.Text = value;
        }
    }

ChildWindow.xaml:

ChildWindow.xaml.cs:

    /// 

    /// ChildWindow.xaml 的交互逻辑
    /// 
    public partial class ChildWindow : Window
    {
        // 在子窗体中声明一个委托(带string类型的参数的委托)
        public delegate void SendMessage(string str);

        public SendMessage sendMessage;
        public ChildWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            // 获取子窗体输入的值
            var childText = childInput.Text;
            // 通过委托将输入的值传回主窗体
            sendMessage(childText);
        }

    }