WPF XAML 在不同 window 上更改 webbrowser url 的两个按钮

Question

我似乎无法在 Window2 上使用我的两个按钮来成功更改主 window 上的网络浏览器 url。我想做的就是单击第一个按钮转到一个地址，然后单击另一个按钮转到另一个地址。我试过绑定但没有成功，我试过将 MainWindow webbrowser 设置为新的 Uri，但这也不起作用。我得到一个错误：'NullReferenceException was unhandled' "Object reference not set to an instance of an object."

不确定我做错了什么，如有任何帮助，我们将不胜感激。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using System.Timers;
using System.Threading;



namespace _2CAMS
{
/// <summary>
/// Interaction logic for Window2.xaml
/// </summary>
/// 

public partial class Window2 : Window
{
    MainWindow mw;

    public Window2()
    {
        InitializeComponent();

    }

    private void Window_Loaded(object sender, RoutedEventArgs e)
    {
        this.ShowActivated = true;
        this.MouseLeftButtonDown += delegate { this.DragMove(); };
    }

    private void Button1_Checked(object sender, RoutedEventArgs e)
    {

    }

    private void button2_Click(object sender, RoutedEventArgs e)
    {
        this.Close();
        Application.Current.Shutdown();
    }

    private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        //this.DragMove();
    }

    private void Image1_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        System.Diagnostics.Process.Start("http://www.website.com");

    }

    private void button3_Click(object sender, RoutedEventArgs e)
    {
        Application.Current.MainWindow.WindowState = System.Windows.WindowState.Minimized;

        //App.Current.MainWindow.Hide();
        Window3 win3 = new Window3();
        win3.Show();
        this.WindowState = System.Windows.WindowState.Minimized;
    }

    private void button4_Click(object sender, RoutedEventArgs e)
    {
        mw.webBrowser1.Navigate(new Uri("http://www.address1.com"));

    }

    private void button5_Click(object sender, RoutedEventArgs e)
    {

        mw.webBrowser1.Navigate(new Uri("http://www.address2.com"));
    }

}
}

Answer 1

((MainWindow)App.Current.MainWindow).webBrowser1.Navigate(new Uri("http://address1.com"));

是否有效，或者会抛出 InvalidCastException？

WPF XAML 在不同 window 上更改 webbrowser url 的两个按钮

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