如何在DirectX UWP应用程序中显示XAML页面

<SwapChainPanel x:Name="swapChainPanel" />

using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;
using Windows.UI.Xaml.Hosting;
using Microsoft.Graphics.Canvas.UI.Xaml;

public sealed partial class MainPage : Page
{
    private SwapChainPanel swapChainPanel;
    private CanvasSwapChain swapChain;

    public MainPage()
    {
        this.InitializeComponent();
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        base.OnNavigatedTo(e);

        // 获取SwapChainPanel控件
        swapChainPanel = this.swapChainPanel;

        // 初始化DirectX渲染
        InitializeDirectX();
    }

    private void InitializeDirectX()
    {
        // 创建SwapChain描述
        SwapChainDescription1 swapChainDescription = new SwapChainDescription1()
        {
            Width = (uint)swapChainPanel.ActualWidth,
            Height = (uint)swapChainPanel.ActualHeight,
            Format = DirectXPixelFormat.B8G8R8A8UIntNormalized,
            Stereo = false,
            SampleDescription = new SampleDescription(1, 0),
            Usage = DXGI.Usage.RenderTargetOutput,
            BufferCount = 2,
            Scaling = DXGI.Scaling.Stretch,
            SwapEffect = DXGI.SwapEffect.FlipSequential,
        };

        // 创建SwapChain
        swapChain = CanvasSwapChain.CreateForCompositionAsync(
            CanvasDevice.GetSharedDevice(),
            swapChainDescription,
            new CompositionTarget(canvasDevice),
            new CanvasSwapChainFactory()).GetAwaiter().GetResult();

        // 将SwapChain设置为当前的渲染目标
        using (var ds = swapChain.CreateDrawingSurface(swapChainPanel.ActualWidth, swapChainPanel.ActualHeight, DirectXPixelFormat.B8G8R8A8UIntNormalized, DirectXAlphaMode.Premultiplied))
        {
            swapChainPanel.SwapChain = swapChain;
        }
    }
}

using Windows.ApplicationModel.Background;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Hosting;
using Microsoft.Graphics.Canvas.UI.Xaml;

public sealed class XamlRenderingBackgroundTask : IBackgroundTask
{
    private SwapChainPanel swapChainPanel;
    private CanvasSwapChain swapChain;

    public void Run(IBackgroundTaskInstance taskInstance)
    {
        // 获取SwapChainPanel控件
        swapChainPanel = MainPage.Current.swapChainPanel;

        // 创建SwapChain描述
        SwapChainDescription1 swapChainDescription = new SwapChainDescription1()
        {
            Width = (uint)swapChainPanel.ActualWidth,
            Height = (uint)swapChainPanel.ActualHeight,
            Format = DirectXPixelFormat.B8G8R8A8UIntNormalized,
            Stereo = false,
            SampleDescription = new SampleDescription(1, 0),
            Usage = DXGI.Usage.RenderTargetOutput,
            BufferCount = 2,
            Scaling = DXGI.Scaling.Stretch,
            SwapEffect = DXGI.SwapEffect.FlipSequential,
        };

        // 创建SwapChain
        swapChain = CanvasSwapChain.CreateForCompositionAsync(
            CanvasDevice.GetSharedDevice(),
            swapChainDescription,
            new CompositionTarget(canvasDevice),
            new CanvasSwapChainFactory()).GetAwaiter().GetResult();

        // 将SwapChain设置为当前的渲染目标
        using (var ds = swapChain.CreateDrawingSurface(swapChainPanel.ActualWidth, swapChainPanel.ActualHeight, DirectXPixelFormat.B8G8R8A8UIntNormalized, DirectXAlphaMode.Premultiplied))
        {
            swapChainPanel.SwapChain = swapChain;
        }
    }
}