如何从主窗口中的页面运行线程？ （WPF）

Question

I created a page and added a button to this page.

And I put this page in a frame in the main window.

MainUi.Content = new Page1();

I want to start a thread in mainwindow when I click the button.

In MainWindow

namespace WpfApp3
{

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
    }

    public void SendMessage()
    {
        MessageBox.Show("This is a test massage.");
        //And more
    }
}

In Page

namespace WpfApp3.Pages
{

    public partial class Page1: Page
    {
        public Page1()
        {
            InitializeComponent();
        }

        private void SendMessage_Click(object sender, RoutedEventArgs e)
        {
             SendMessage(); 
             //I want run this thread from here
        }
    }
}

Thanks.

Answer 1

You could inject the Page with a reference to the window as suggested by @Nawed Nabi Zada, or you could get a reference to the parent window of the page using the static Window.GetWindow method:

private void SendMessage_Click(object sender, RoutedEventArgs e)
{
    MainWindow win = Window.GetWindow(this) as MainWindow;
    win.SendMessage();
}

Answer 2

In your Page constructor add a parameter for MainWindow

private MainWindow _mainWindow;
public Page1(MainWindow mainWindow)
{
     InitializeComponent();
    _mainWindow   = mainWindow;     
}

Then you can call the message from there:

private void SendMessage_Click(object sender, RoutedEventArgs e)
{
    SendMessage(); 
    //I want run this thread from here

    _mainWindow.SendMessage();
}

Alternative:

Make your method static:

public static void SendMessage()
{
    MessageBox.Show("This is a test massage.");
    //And more
}

private void SendMessage_Click(object sender, RoutedEventArgs e)
    {
         MainWindow.SendMessage(); 
         //I want run this thread from here
    }