simply_demo_refresh_desktop

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

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private int last_file_count = 0;
        private string path_to_current_user_dektop = "";

        [DllImport("shell32.dll", CharSet = CharSet.Auto)]
        static extern void SHChangeNotify(uint wEventId, uint uFlags, IntPtr dwItem1, IntPtr dwItem2);
        const uint SHCNE_ASSOCCHANGED = 0x08000000;
        const uint SHCNF_IDLIST = 0x0000;

        public Form1()
        {
            // dodać do Form - Label i Timer

            InitializeComponent();
            timer1.Interval = 1000; // 1000ms = 1s.

            // ustawienie Form w prawym górnym rogu ekranu
            // docelowo napisać kod, który pokaże tylko ikone w "zasobniku"
            int screenWidth = Screen.PrimaryScreen.Bounds.Width;
            this.StartPosition = FormStartPosition.Manual;
            this.Location = new Point((screenWidth - this.Width), 0);

            // pobranie ścieżki do pulpitu zalogowanego użytkownika
            path_to_current_user_dektop = Environment.ExpandEnvironmentVariables(@"%userprofile%\Desktop");
            // zainicjowanie ilości plików na pulpicie
            last_file_count = fileCount();

            // właczenie timera, ktory co 1s sprawdzi zawartość pulpitu
            timer1.Enabled = true;
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            int current_file_count = fileCount();
            label1.Text = "Number of files on desktop: " + current_file_count;
            if (current_file_count != last_file_count)
            {
                last_file_count = current_file_count;
                // odśwież zawartośc pulpitu użytkownika
                SHChangeNotify(SHCNE_ASSOCCHANGED, SHCNF_IDLIST, IntPtr.Zero, IntPtr.Zero);
            }
        }

        private int fileCount()
        {
            return Directory.GetFiles(path_to_current_user_dektop).Length;
        }
    }
}