<Window x:Class="project1.UI.Explorer"
    xmlns:common="clr-namespace:project1.common;assembly=project1.common"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="300" Width="550">
  <Window.Resources>

    <common:DirectoryCollection x:Key="DataSource"/>
    
  </Window.Resources>
  
  <Grid>
    
    <ListView x:Name="catalog" ItemsSource="{StaticResource DataSource}"/>

  </Grid>
</Window>

using System;
using System.Management;
using System.Threading;
using System.Collections.ObjectModel;
using System.Windows.Threading;

namespace project1.common
{
  public class DirectoryCollection : Directory, IDisposable
  {

    public DirectoryCollection()
    {
      InitializeWatcher();
    }

    private void InitializeWatcher()
    {
      WqlEventQuery wqlquery = new WqlEventQuery(watcherquery);
      _watcher = new ManagementEventWatcher(wqlquery);
      _watcher.EventArrived += new EventArrivedEventHandler(watcher_EventArrived);
      _watcher.Start();
    }

    private void watcher_EventArrived(object sender, EventArrivedEventArgs e)
    {
      ManagementBaseObject wmiDevice = (ManagementBaseObject)e.NewEvent["TargetInstance"];
      string driveName = (string)wmiDevice["DeviceID"];
      if (wmiDevice["Size"] == null)
      {
        Directory x = null;
        foreach (Directory directory in this)
          if (directory.Path.Substring(0, 2) == driveName)
          {
            x = directory;
            break;
          }
        Remove(x);
      }
      else
      {
        Add(new Directory(driveName));
      }
    }

    #region IDisposable Members

    public void Dispose()
    {
      Dispose(true);
      GC.SuppressFinalize(this);
    }

    protected virtual void Dispose(bool disposing)
    {
      if (disposed) return;
      disposed = true;

      if (disposing)
      {
        this.Clear();
        _watcher.EventArrived -= new EventArrivedEventHandler(watcher_EventArrived);
        _watcher.Stop();
      }
    }

    ~DirectoryCollection()
    {
      Dispose(false);
    }

    private bool disposed = false;

    #endregion

    private ManagementEventWatcher _watcher;

    private static readonly string watcherquery = @"select * from __InstanceOperationEvent within 0.5 where Targetinstance ISA 'Win32_LogicalDisk' and Targetinstance.DriveType <> 3 and Targetinstance.DeviceID <> 'A:'";
    private static readonly string logicaldisksquery = "select * from Win32_LogicalDisk where DriveType <> 3 and DeviceID <> 'A:' and Size > 0";

  }
}