摘要：
FileWatcher可以使用系统实时监控目录中的文件（新的、重命名的、修改的、删除的）；使用系统。IO；使用System.Windows。形式；命名空间Fw｛public分部类frm1：表单｛private FileSystemWatcher观察者
FileWatcher能实现对某一目录的文件(新建,改名,内容修改,删除)的实时监视
using System;
using System.IO;
using System.Windows.Forms;
namespace Fw
{
public partial class frm1 : Form
{
private FileSystemWatcher watcher;
private delegate void UpdateWatchTextDelegate(string newText);
public frm1()
{
InitializeComponent();
this.watcher = new FileSystemWatcher();
this.watcher.Deleted += new FileSystemEventHandler(watcher_Deleted);
this.watcher.Renamed += new RenamedEventHandler(watcher_Renamed);
this.watcher.Changed += new FileSystemEventHandler(watcher_Changed);
this.watcher.Created += new FileSystemEventHandler(watcher_Created);
}
public void UpdateWatchText(string newText)
{
lblWatch.Text = newText;
}
public void WriteLog(string LogContent)
{
using (StreamWriter sw = new StreamWriter("c:\\Log.txt", true))
{
sw.WriteLine(LogContent);
sw.Close();
}
}
void watcher_Created(object sender, FileSystemEventArgs e)
{
try
{
WriteLog(String.Format("File: {0} Created", e.FullPath));
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "文件" + e.FullPath + "被创建");
}
catch (IOException)
{
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "创建日志写入失败!");
}
}
void watcher_Changed(object sender, FileSystemEventArgs e)
{
try
{
WriteLog(String.Format("File: {0} {1}", e.FullPath, e.ChangeType.ToString()));
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "文件" + e.FullPath + "被修改");
}
catch (IOException)
{
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "修改日志写入失败!");
}
}
void watcher_Renamed(object sender, RenamedEventArgs e)
{
try
{
WriteLog(String.Format("File renamed from {0} to {1}", e.OldName, e.FullPath));
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "文件" + e.OldName + "被重命名为" + e.FullPath);
}
catch (IOException)
{
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "重命名日志写入失败!");
}
}
void watcher_Deleted(object sender, FileSystemEventArgs e)
{
try
{
WriteLog(String.Format("File: {0} Deleted", e.FullPath));
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "文件" + e.FullPath + "被删除");
}
catch (IOException)
{
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "删除日志写入失败!");
}
}
private void cmdBrowse_Click(object sender, EventArgs e)
{
if (this.folderBrowserDialog1.ShowDialog() != DialogResult.Cancel)
{
txtLocation.Text = this.folderBrowserDialog1.SelectedPath;
cmdWatch.Enabled = true;
}
}
private void cmdWatch_Click(object sender, EventArgs e)
{
if (txtLocation.Text.Length <= 0)
{
MessageBox.Show("请先选择要监视的文件夹!");
cmdBrowse.Focus();
return;
}
watcher.Path = txtLocation.Text;//监控路径（文件夹）
watcher.Filter = "*.*";//如果filter为文件名称则表示监控该文件，如果为*.txt则表示要监控指定目录当中的所有.txt文件
watcher.NotifyFilter = NotifyFilters.LastWrite |
NotifyFilters.FileName |
NotifyFilters.Size;
lblWatch.Text = watcher.Path + " 监视中
";
//begin watching.
watcher.EnableRaisingEvents = true;
}
private void btnStop_Click(object sender, EventArgs e)
{
watcher.EnableRaisingEvents = false;
lblWatch.Text = watcher.Path + " 监视已经停止!";
}
}
}
using System.IO;
using System.Windows.Forms;
namespace Fw
{
public partial class frm1 : Form
{
private FileSystemWatcher watcher;
private delegate void UpdateWatchTextDelegate(string newText);
public frm1()
{
InitializeComponent();
this.watcher = new FileSystemWatcher();
this.watcher.Deleted += new FileSystemEventHandler(watcher_Deleted);
this.watcher.Renamed += new RenamedEventHandler(watcher_Renamed);
this.watcher.Changed += new FileSystemEventHandler(watcher_Changed);
this.watcher.Created += new FileSystemEventHandler(watcher_Created);
}
public void UpdateWatchText(string newText)
{
lblWatch.Text = newText;
}
public void WriteLog(string LogContent)
{
using (StreamWriter sw = new StreamWriter("c:\\Log.txt", true))
{
sw.WriteLine(LogContent);
sw.Close();
}
}
void watcher_Created(object sender, FileSystemEventArgs e)
{
try
{
WriteLog(String.Format("File: {0} Created", e.FullPath));
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "文件" + e.FullPath + "被创建");
}
catch (IOException)
{
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "创建日志写入失败!");
}
}
void watcher_Changed(object sender, FileSystemEventArgs e)
{
try
{
WriteLog(String.Format("File: {0} {1}", e.FullPath, e.ChangeType.ToString()));
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "文件" + e.FullPath + "被修改");
}
catch (IOException)
{
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "修改日志写入失败!");
}
}
void watcher_Renamed(object sender, RenamedEventArgs e)
{
try
{
WriteLog(String.Format("File renamed from {0} to {1}", e.OldName, e.FullPath));
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "文件" + e.OldName + "被重命名为" + e.FullPath);
}
catch (IOException)
{
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "重命名日志写入失败!");
}
}
void watcher_Deleted(object sender, FileSystemEventArgs e)
{
try
{
WriteLog(String.Format("File: {0} Deleted", e.FullPath));
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "文件" + e.FullPath + "被删除");
}
catch (IOException)
{
this.BeginInvoke(new UpdateWatchTextDelegate(UpdateWatchText), "删除日志写入失败!");
}
}
private void cmdBrowse_Click(object sender, EventArgs e)
{
if (this.folderBrowserDialog1.ShowDialog() != DialogResult.Cancel)
{
txtLocation.Text = this.folderBrowserDialog1.SelectedPath;
cmdWatch.Enabled = true;
}
}
private void cmdWatch_Click(object sender, EventArgs e)
{
if (txtLocation.Text.Length <= 0)
{
MessageBox.Show("请先选择要监视的文件夹!");
cmdBrowse.Focus();
return;
}
watcher.Path = txtLocation.Text;//监控路径（文件夹）
watcher.Filter = "*.*";//如果filter为文件名称则表示监控该文件，如果为*.txt则表示要监控指定目录当中的所有.txt文件
watcher.NotifyFilter = NotifyFilters.LastWrite |
NotifyFilters.FileName |
NotifyFilters.Size;
lblWatch.Text = watcher.Path + " 监视中
";//begin watching.
watcher.EnableRaisingEvents = true;
}
private void btnStop_Click(object sender, EventArgs e)
{
watcher.EnableRaisingEvents = false;
lblWatch.Text = watcher.Path + " 监视已经停止!";
}
}
}
注：如果目录下还有子目录，FileWatcher默认情况下并不能监视到子目录下的文件，可以通过设置watcher.IncludeSubdirectories = true; 解决这个问题