在WPF应用程序中使用UWP UI

Question

我有一个在后台运行的应用程序，但是我想用UWP API添加一个窗口。

在添加参考到：

Windows.UI
Windows.UI.Xaml

我尝试通过以下方式启动UWP应用程序：

Windows.UI.Xaml.Application.Start(p => new UWPApp(); );

在UWPApp类中，我添加了UWP模板代码：

using System;
using System.Diagnostics;
using Windows.ApplicationModel;
using Windows.ApplicationModel.Activation;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Navigation;

namespace ClipboardSync {

    public class UWPApp : Windows.UI.Xaml.Application {

        private bool _contentLoaded;

        public void InitializeComponent() {
            if (_contentLoaded)
                return;

            _contentLoaded = true;
        }

        public UWPApp() {
            this.InitializeComponent();
            this.Suspending += OnSuspending;
        }


        protected override void OnLaunched(LaunchActivatedEventArgs e) {
            Frame rootFrame = Window.Current.Content as Frame;

            // Do not repeat app initialization when the Window already has content,
            // just ensure that the window is active
            if (rootFrame == null) {
                // Create a Frame to act as the navigation context and navigate to the first page
                rootFrame = new Frame();

                rootFrame.NavigationFailed += OnNavigationFailed;

                if (e.PreviousExecutionState == ApplicationExecutionState.Terminated) {
                    //TODO: Load state from previously suspended application
                }

                // Place the frame in the current Window
                Window.Current.Content = rootFrame;
            }

            if (e.PrelaunchActivated == false) {
                if (rootFrame.Content == null) {
                    // When the navigation stack isn't restored navigate to the first page,
                    // configuring the new page by passing required information as a navigation
                    // parameter
                    rootFrame.Navigate(typeof(MainPage), e.Arguments);
                }
                // Ensure the current window is active
                Window.Current.Activate();
            }
        }

        /// <summary>
        /// Invoked when Navigation to a certain page fails
        /// </summary>
        /// <param name="sender">The Frame which failed navigation</param>
        /// <param name="e">Details about the navigation failure</param>
        void OnNavigationFailed(object sender, NavigationFailedEventArgs e) {
            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
        }

        /// <summary>
        /// Invoked when application execution is being suspended.  Application state is saved
        /// without knowing whether the application will be terminated or resumed with the contents
        /// of memory still intact.
        /// </summary>
        /// <param name="sender">The source of the suspend request.</param>
        /// <param name="e">Details about the suspend request.</param>
        private void OnSuspending(object sender, SuspendingEventArgs e) {
            var deferral = e.SuspendingOperation.GetDeferral();
            //TODO: Save application state and stop any background activity
            deferral.Complete();
        }

    }  

}

但是不会创建新的UWPApp实例，也没有错误消息。

是否存在某种限制，使我无法在WPF应用程序内启动UWP应用程序？

Answer 1

更新1/31/2019回到这里来更新我的答案。 从Windows 10更新1809（内部版本17763+）开始，现在支持此功能。 此处提供更多信息和示例： https : //blogs.windows.com/buildingapps/2018/11/02/xaml-islands-a-deep-dive-part-1/

旧答案-1809年之前，今天不支持。 Windows.UI.XAML。*当前只能在UWP应用程序进程中使用。

但是，在今年早些时候的BUILD2017上，宣布计划在Windows 10的未来更新中对此提供支持：

https://channel9.msdn.com/Events/Build/2017/B8100