Hold and show NotifyIcon from WPF app.

NotifyIconHolder.cs

using System;
using System.Runtime.InteropServices;
using System.Windows;
using System.Windows.Forms;

public class NotifyIconHolder
{
    public event EventHandler<Point>? MouseRightClick;
    public event EventHandler<Point>? MouseLeftClick;
    public event EventHandler<Point>? MouseDoubleClick;

    [DllImport("User32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool GetCursorPos(out POINT lpPoint);

    [StructLayout(LayoutKind.Sequential)]
    private struct POINT
    {
        public int x;
        public int y;

        public static implicit operator System.Windows.Point(POINT p) => new(p.x, p.y);
    }

    private NotifyIcon? _notifyIcon;

    public void ShowIcon(System.Drawing.Icon icon, string text)
    {
        if (_notifyIcon is null)
        {
            _notifyIcon = new NotifyIcon()
            {
                Icon = icon,
                Text = text
            };
            _notifyIcon.MouseClick += (_, e) =>
            {
                if (GetCursorPos(out POINT position))
                {
                    switch (e.Button)
                    {
                        case MouseButtons.Left:
                            MouseLeftClick?.Invoke(null, position);
                            break;
                        case MouseButtons.Right:
                            MouseRightClick?.Invoke(null, position);
                            break;
                    }
                }
            };
            _notifyIcon.MouseDoubleClick += (_, _) =>
            {
                if (GetCursorPos(out POINT position))
                {
                    MouseDoubleClick?.Invoke(null, position);
                }
            };
            _notifyIcon.Visible = true;
        }
    }

    public void HideIcon()
    {
        _notifyIcon?.Dispose();
        _notifyIcon = null;
    }
}