notifyicon未引发点击事件，上下文菜单条未显示

我遇到了一个问题，notifyicon显示得很好，并显示了它的气泡，但它在单击时不会引发单击事件。

它应该显示其上下文菜单条，但如果我将contextmenustrip.show();添加到代码中，它只显示菜单的阴影，而不显示菜单本身。

该函数是WPF应用程序的一部分，通过WCF服务应用程序的命名管道进行调用。

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代码，以备不时之需：

在服务应用程序中：

public partial class Service1 : ServiceBase
    {
        ChannelFactory<ILicenseWatchingServiceUIHost> pipeFactory;
        ILicenseWatchingServiceUIHost LWSProxy;

        public Service1()
        {
            InitializeComponent();    
        }
        #region service states
        protected override void OnStart(string[] args)
        {
            pipeFactory = new ChannelFactory<ILicenseWatchingServiceUIHost>(
                new NetNamedPipeBinding(),
                new EndpointAddress("net.pipe://localhost/LWSPipe"));
            LWSProxy = pipeFactory.CreateChannel();
            Run();
        }
        //...
        private void Run()
        {
            //...
            LWSProxy.Execute();
        }
    }

WPF应用程序中的服务器创建：

public partial class App : Application
    {
        ServiceHost host = new ServiceHost(typeof(LicenseWatchingServiceUserInterface), new Uri[] { new Uri("net.pipe://localhost") });
        public App()
        {
            StartServer();
        }
        private void StartServer()
        {
            host.AddServiceEndpoint(typeof(ILicenseWatchingServiceUIHost), new NetNamedPipeBinding(), "LWSPipe");
            host.Open();
            BackgroundWorker worker = new BackgroundWorker();
            System.Windows.Threading.Dispatcher dispatcher = this.Dispatcher;
        }
    }

最后：

public class LicenseWatchingServiceUserInterface : ILicenseWatchingServiceUIHost
    {
        private System.ComponentModel.IContainer components = null;
        private System.Windows.Forms.NotifyIcon notifyIcon;
        private System.Windows.Forms.ContextMenuStrip contextMenuStrip;
        void Execute(){
        //...
        contextmenustrip.show(); //does not work
        }
        //does not get raised
        private void notifyIcon_Click(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Right)
            {
                    contextMenuStrip.Show(Cursor.Position.X, Cursor.Position.Y);
                }
                else if (e.Button == MouseButtons.Left)
                {
                    Execute();
                }
            }
        }
        void Init()
        {
            this.components = new System.ComponentModel.Container();
            System.ComponentModel.ComponentResourceManager resources = new System.ComponentModel.ComponentResourceManager(typeof(LicenseWatchingServiceUserInterface));
            this.notifyIcon = new System.Windows.Forms.NotifyIcon();
            this.contextMenuStrip = new System.Windows.Forms.ContextMenuStrip();
            // 
            // notifyIcon
            // 
            this.notifyIcon.BalloonTipIcon = System.Windows.Forms.ToolTipIcon.Info;
            this.notifyIcon.ContextMenuStrip = this.contextMenuStrip;
            this.notifyIcon.Icon = iconLoading;
            this.notifyIcon.Visible = true;
            //clickhandler is in fact wired up
            this.notifyIcon.MouseClick += new System.Windows.Forms.MouseEventHandler(this.notifyIcon_Click);
            // 
            // contextMenuStrip
            // 
            this.contextMenuStrip.ImageScalingSize = new System.Drawing.Size(20, 20);
            this.contextMenuStrip.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.settingsToolStripMenuItem,
            this.openLicenseManagerToolStripMenuItem,
            this.closeToolStripMenuItem});
            this.contextMenuStrip.Name = "contextMenuStrip";
            this.contextMenuStrip.Size = new System.Drawing.Size(234, 128);
            //
            // contextmenustrip items...
            //
        }
        //...
    }

public class LicenseWatchingServiceUICreator : ILicenseWatchingServiceUIHost
    {
        public void Execute(List<LicenseInfoContainerExpiring> elcs, List<LicenseInfoContainerUntrusted> ulcs)
        {
            System.Windows.Application.Current.Dispatcher.Invoke(new Action(() => 
            {
                LicenseWatchingServiceUserInterface LWSUI = new LicenseWatchingServiceUserInterface(elcs, ulcs); 
            }));
        }
    }