用WPF写一段多视图切换，而且有良好的内存管理机制的代码

以下是一个基于WPF的多视图切换代码示例，它具有良好的内存管理机制：

MainWindow.xaml：

<Window x:Class="MultiViewSwitching.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Multi View Switching" Height="350" Width="525">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <StackPanel Grid.Row="0" Orientation="Horizontal" HorizontalAlignment="Center">
            <Button Content="View 1" Click="View1Button_Click"/>
            <Button Content="View 2" Click="View2Button_Click"/>
            <Button Content="View 3" Click="View3Button_Click"/>
        </StackPanel>
        <ContentControl Grid.Row="1" Content="{Binding CurrentView}"/>
    </Grid>
</Window>

MainWindow.xaml.cs：

using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Windows;
using MultiViewSwitching.Views;

namespace MultiViewSwitching
{
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        private object _currentView;

        public object CurrentView
        {
            get { return _currentView; }
            set
            {
                if (_currentView != value)
                {
                    _currentView = value;
                    OnPropertyChanged();
                }
            }
        }

        public MainWindow()
        {
            InitializeComponent();

            // Set the initial view
            CurrentView = new View1();
        }

        private void View1Button_Click(object sender, RoutedEventArgs e)
        {
            // Switch to view 1
            CurrentView = new View1();
        }

        private void View2Button_Click(object sender, RoutedEventArgs e)
        {
            // Switch to view 2
            CurrentView = new View2();
        }

        private void View3Button_Click(object sender, RoutedEventArgs e)
        {
            // Switch to view 3
            CurrentView = new View3();
        }

        public event PropertyChangedEventHandler PropertyChanged;

        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

View1.xaml：

<UserControl x:Class="MultiViewSwitching.Views.View1"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <TextBlock Text="View 1"/>
    </Grid>
</UserControl>

View2.xaml：

<UserControl x:Class="MultiViewSwitching.Views.View2"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <TextBlock Text="View 2"/>
    </Grid>
</UserControl>

View3.xaml：

<UserControl x:Class="MultiViewSwitching.Views.View3"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             mc:Ignorable="d" 
             d:DesignHeight="300" d:DesignWidth="300">
    <Grid>
        <TextBlock Text="View 3"/>
    </Grid>
</UserControl>

该示例使用ContentControl和数据绑定来实现多视图切换。每个视图都是一个用户控件，当用户点击按钮时，当前视图的Content属性将更改为新视图的实例。由于WPF具有内置的垃圾收集机制，因此不需要手动管理每个视图的内存。