次のような解決策を提案します。
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Threading;
/// <summary>
/// Represents our program class which contains the entry point of our application.
/// </summary>
public class Program
{
/// <summary>
/// Represents the entry point of our application.
/// </summary>
/// <param name="args">Possibly spcified command line arguments.</param>
public static void Main(string[] args)
{
RemovableDriveWatcher rdw = new RemovableDriveWatcher(); // Create a new instance of the RemoveableDriveWatcher class.
rdw.NewDriveFound += NewDriveFound; // Connect to the "NewDriveFound" event.
rdw.DriveRemoved += DriveRemoved; // Connect to the "DriveRemoved" event.
rdw.Start(); // Start watching.
// Do something here...
Console.ReadLine();
rdw.Stop(); // Stop watching.
}
/// <summary>
/// Is executed when a new drive has been found.
/// </summary>
/// <param name="sender">The sender of this event.</param>
/// <param name="e">The event arguments containing the changed drive.</param>
private static void NewDriveFound(object sender, RemovableDriveWatcherEventArgs e)
{
Console.WriteLine(string.Format("Found a new drive, the name is: {0}", e.ChangedDrive.Name));
}
/// <summary>
/// Is executed when a drive has been removed.
/// </summary>
/// <param name="sender">The sender of this event.</param>
/// <param name="e">The event arguments containing the changed drive.</param>
private static void DriveRemoved(object sender, RemovableDriveWatcherEventArgs e)
{
Console.WriteLine(string.Format("The drive with the name {0} has been removed.", e.ChangedDrive.Name));
}
}
RemoveableDriveWatcher クラスは次のようになります。
/// <summary>
/// Repesents a watcher class for removable drives.
/// </summary>
public class RemovableDriveWatcher
{
/// <summary>
/// Represents the watcher thread which watches for new drives.
/// </summary>
private Thread watcherThread;
/// <summary>
/// Continas all found logical drives of this system.
/// </summary>
private List<DriveInfo> foundDrives;
/// <summary>
/// Initializes a new instance of the <see cref="RemovableDriveWatcher"/> class.
/// </summary>
public RemovableDriveWatcher()
{
this.foundDrives = new List<DriveInfo>();
this.watcherThread = new Thread(new ThreadStart(ScanLogicalDrives));
this.WaitBetweenScansDelay = 1000;
}
/// <summary>
/// Is fired if a new drive has been detected.
/// </summary>
public event EventHandler<RemovableDriveWatcherEventArgs> NewDriveFound;
/// <summary>
/// Is fired if a drive has been removed.
/// </summary>
public event EventHandler<RemovableDriveWatcherEventArgs> DriveRemoved;
/// <summary>
/// Gets or sets the delay in ms between two scans.
/// </summary>
public int WaitBetweenScansDelay
{
get;
set;
}
/// <summary>
/// Starts the watcher.
/// </summary>
public void Start()
{
if (!this.watcherThread.IsAlive)
{
this.watcherThread.Start();
}
}
/// <summary>
/// Stops the watcher.
/// </summary>
public void Stop()
{
if (this.watcherThread.IsAlive)
{
this.watcherThread.Abort();
this.watcherThread.Join();
}
}
/// <summary>
/// Scans for logical drives and fires an event every time a new
/// drive has been found or a drive was removed.
/// </summary>
private void ScanLogicalDrives()
{
DriveInfo[] drives;
do
{
drives = DriveInfo.GetDrives();
// Check for new drives
foreach (DriveInfo drive in drives)
{
if (!(drive.DriveType == DriveType.Removable))
{
continue;
}
if (!drive.IsReady)
{
continue;
}
if (!this.foundDrives.ContainsWithName(drive))
{
this.foundDrives.Add(drive);
if (this.NewDriveFound != null)
{
this.NewDriveFound(this, new RemovableDriveWatcherEventArgs(drives, drive));
}
}
}
// Check for removed drives
for (int i = this.foundDrives.Count - 1; i >= 0; i--)
{
DriveInfo drive = this.foundDrives[i];
if (!drives.ContainsWithName(drive))
{
if (this.DriveRemoved != null)
{
this.DriveRemoved(this, new RemovableDriveWatcherEventArgs(drives, drive));
}
this.foundDrives.RemoveWithName(drive);
}
}
// Sleep
Thread.Sleep(this.WaitBetweenScansDelay);
}
while (true);
}
}
すべてが機能するには、RemovableDriveWatcherEventArgs が必要です。
/// <summary>
/// Represents the RemovableDriveWatcherEventArgs
/// </summary>
public class RemovableDriveWatcherEventArgs : EventArgs
{
/// <summary>
/// Initializes a new instance of the <see cref="RemovableDriveWatcherEventArgs"/> class.
/// </summary>
/// <param name="allDrives">All currently available logical drives in the system.</param>
/// <param name="changedDrive">The changed drive.</param>
public RemovableDriveWatcherEventArgs(DriveInfo[] allDrives, DriveInfo changedDrive)
{
this.Drives = allDrives;
this.ChangedDrive = changedDrive;
}
/// <summary>
/// Gets the changed logical drive that has either been detected or removed.
/// </summary>
public DriveInfo ChangedDrive { get; private set; }
/// <summary>
/// Gets all currently available logical drives.
/// </summary>
public DriveInfo[] Drives { get; private set; }
}
そしてもちろん拡張機能:
/// <summary>
/// Contains extensions used by the RemovableDriveWatcher class.
/// </summary>
public static class RemovableDriveWatcherExtensions
{
/// <summary>
/// Extends the DiveInfo[] by the ContainsWithName method.
/// </summary>
/// <param name="all">The array where we want to find the specified instance.</param>
/// <param name="search">The instance which we want to find in the array.</param>
/// <returns>TRUE if the specified instance was found, FALSE if the specified instance was not found.</returns>
public static bool ContainsWithName(this DriveInfo[] all, DriveInfo search)
{
for (int i = 0; i < all.Length; i++)
{
if (all[i].Name == search.Name)
{
return true;
}
}
return false;
}
/// <summary>
/// Extends the List<DriveInfo> by the ContainsWithName method.
/// </summary>
/// <param name="all">The array where we want to find the specified instance.</param>
/// <param name="search">The instance which we want to find in the list.</param>
/// <returns>TRUE if the specified instance was found, FALSE if the specified instance was not found.</returns>
public static bool ContainsWithName(this List<DriveInfo> all, DriveInfo search)
{
for (int i = 0; i < all.Count; i++)
{
if (all[i].Name == search.Name)
{
return true;
}
}
return false;
}
/// <summary>
/// Extends the List<DriveInfo> by the RemoveWithName method.
/// </summary>
/// <param name="all">The array where we want to removed the specified instance.</param>
/// <param name="search">The instance which we want to remove in the list.</param>
public static void RemoveWithName(this List<DriveInfo> all, DriveInfo search)
{
for (int i = 0; i < all.Count; i++)
{
if (all[i].Name == search.Name)
{
all.RemoveAt(i);
return;
}
}
}
}
これが少し役立つことを願っています。