WPF设置托盘图标

using System;
using System.Drawing;
using System.Windows.Forms;

namespace ColorPicker.Utils
{
    public class SystemTray
    {
        public static SystemTray Instance;

        /// <summary>
        /// 静态构造函数,在类第一次被创建或者静态成员被调用的时候调用
        /// </summary>
        static SystemTray()
        {
            Instance = new SystemTray();
        }

        public NotifyIcon Ni { get; set; }

        private SystemTray()
        {
            Ni = new System.Windows.Forms.NotifyIcon();

            Ni.Icon = new Icon(
               System.Windows.Application.GetResourceStream(
                 new Uri(
                 "app.ico", UriKind.Relative)
               ).Stream
             );
            //Ni.Icon = SystemIcons.Question;
            Ni.Visible = true;
            Ni.MouseClick += Ni_MouseClick;
        }

        private void Ni_MouseClick(object sender, MouseEventArgs e)
        {
            System.Windows.Controls.ContextMenu NotifyIconMenu = (System.Windows.Controls.ContextMenu)App.Current.FindResource("NotifyIconMenu");
            if (e.Button == MouseButtons.Right)
            {
                NotifyIconMenu.IsOpen = true;
            }
            else
            {
                NotifyIconMenu.IsOpen = false;
            }
        }

        /// <summary>
        /// 销毁系统托盘图标的资源
        /// </summary>
        public void DisposeNotifyIcon()
        {
            Ni?.Dispose();
        }
    }
}

<Application.Resources>
  <ContextMenu x:Key="NotifyIconMenu" StaysOpen="False">
    <MenuItem
              Name="MenuExit"
              Click="MenuExit_Click"
              Header="退出" />
  </ContextMenu>
</Application.Resources>

public partial class App : Application
{
  private void MenuExit_Click(object sender, RoutedEventArgs e)
  {
    SystemTray.Instance.DisposeNotifyIcon();
    App.Current.Shutdown();
  }

  private void Application_Startup(object sender, StartupEventArgs e)
  {
    _ = SystemTray.Instance;
  }
}