我正在努力弄清楚如何浏览页面。目前，当我按下一个按钮时，它打开一个新的空白页面，而不是我想要的页面。或者我得到这个错误：System.InvalidOperationException：'Window必须是树的根。无法将Window添加为Visual的子级。'
我正在努力让它在用户点击按钮时就能跳转到一个新的页面。我真的很感激任何能帮到我的人。
XAML（顺便说一句，这不是全部代码，我只是取了我认为重要的部分）

<Window x:Class="Movie_Appp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Movie_Appp"
        mc:Ignorable="d"
        Title="Main"
        Height="450" 
        Width="800"
        Name="Main"
        WindowStyle="None"
        ResizeMode="NoResize"
        WindowStartupLocation="CenterScreen"
        Background="Transparent"
        AllowsTransparency="True"
        MouseDown="Window_MouseDown">
<Button x:Name="BtnLogin" 
      BorderThickness="0"
      Content="Login"
      Foreground="White"
      FontSize="12"
      FontFamily="Montserrat"
      Cursor="Hand"
      Click="BtnLogin_Click"
      Margin="0, 15,0,0">

  <Button.Style>
      <Style TargetType="{x:Type Button}">
          <Setter Property="Background" Value="#462AD8"/>
          <Style.Triggers>
              <Trigger Property="IsMouseOver" Value="True">
                  <Setter Property="Background" Value="#28AEED"/>
              </Trigger>
          </Style.Triggers>
      </Style>
  </Button.Style>

  <Button.Template>
      <ControlTemplate TargetType="{x:Type Button}">
          <Border Width="150" Height="40"
                  CornerRadius="20"
                  Background="{TemplateBinding Background}">
              <ContentPresenter VerticalAlignment="Center"
                                HorizontalAlignment="Center"/>
          </Border>
      </ControlTemplate>
  </Button.Template>
</Button>

C#

using Movie_Appp.View;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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.Navigation;
using System.Windows.Shapes;

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

        private void BtnLogin_Click(object sender, RoutedEventArgs e)
        {
            // Create a new instance of LoginView
            LoginView loginView = new LoginView();

            // Show the new window
            loginView.Show();
        }

        private void BtnSignUp_Click(object sender, RoutedEventArgs e)
        {
            // Create a new instance of SignUpView
            SignUpView signUpView = new SignUpView();

            // Show the new window
            signUpView.Show();
        }



        private void Window_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed)
            {
                DragMove();
            }
        }

        private void btnMinimize_Click(object sender, RoutedEventArgs e)
        {
            this.WindowState = WindowState.Minimized;
        }

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