http://www.dotblogs.com.tw/dc690216/archive/2010/09/18/17801.aspx
步驟三：實作 FileSystemWatcher 功能
Code：
using System.IO;
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
FileInfo fi;
StringBuilder sb;
DirectoryInfo dirInfo;
FileSystemWatcher _watch = new FileSystemWatcher();
public Form1()
{
InitializeComponent();
MyFileSystemWatcher();
}
private void MyFileSystemWatcher()
{
//設定所要監控的資料夾
_watch.Path = @"C:\張小呆文件夾";
//設定所要監控的變更類型
_watch.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters.DirectoryName;
//設定所要監控的檔案
_watch.Filter = "*.TXT";
//設定是否監控子資料夾
_watch.IncludeSubdirectories = true;
//設定是否啟動元件，此部分必須要設定為 true，不然事件是不會被觸發的
_watch.EnableRaisingEvents = true;
//設定觸發事件
_watch.Created += new FileSystemEventHandler(_watch_Created);
_watch.Changed += new FileSystemEventHandler(_watch_Changed);
_watch.Renamed += new RenamedEventHandler(_watch_Renamed);
_watch.Deleted += new FileSystemEventHandler(_watch_Deleted);
}
/// <summary>
/// 當所監控的資料夾有建立文字檔時觸發
/// </summary>
private void _watch_Created(object sender, FileSystemEventArgs e)
{
sb = new StringBuilder();
dirInfo = new DirectoryInfo(e.FullPath.ToString());
sb.AppendLine("新建檔案於：" + dirInfo.FullName.Replace(dirInfo.Name, ""));
sb.AppendLine("新建檔案名稱：" + dirInfo.Name);
sb.AppendLine("建立時間：" + dirInfo.CreationTime.ToString());
sb.AppendLine("目錄下共有：" + dirInfo.Parent.GetFiles().Count() + " 檔案");
sb.AppendLine("目錄下共有：" + dirInfo.Parent.GetDirectories().Count() + " 資料夾");
MessageBox.Show(sb.ToString());
}
/// <summary>
/// 當所監控的資料夾有文字檔檔案內容有異動時觸發
/// </summary>
private void _watch_Changed(object sender, FileSystemEventArgs e)
{
sb = new StringBuilder();
dirInfo = new DirectoryInfo(e.FullPath.ToString());
sb.AppendLine("被異動的檔名為：" + e.Name);
sb.AppendLine("檔案所在位址為：" + e.FullPath.Replace(e.Name, ""));
sb.AppendLine("異動內容時間為：" + dirInfo.LastWriteTime.ToString());
MessageBox.Show(sb.ToString());
}
/// <summary>
/// 當所監控的資料夾有文字檔檔案重新命名時觸發
/// </summary>
private void _watch_Renamed(object sender, RenamedEventArgs e)
{
sb = new StringBuilder();
fi = new FileInfo(e.FullPath.ToString());
sb.AppendLine("檔名更新前：" + e.OldName.ToString());
sb.AppendLine("檔名更新後：" + e.Name.ToString());
sb.AppendLine("檔名更新前路徑：" + e.OldFullPath.ToString());
sb.AppendLine("檔名更新後路徑：" + e.FullPath.ToString());
sb.AppendLine("建立時間：" + fi.LastAccessTime.ToString());
MessageBox.Show(sb.ToString());
}
/// <summary>
/// 當所監控的資料夾有文字檔檔案有被刪除時觸發
/// </summary>
private void _watch_Deleted(object sender, FileSystemEventArgs e)
{
sb = new StringBuilder();
sb.AppendLine("被刪除的檔名為：" + e.Name);
sb.AppendLine("檔案所在位址為：" + e.FullPath.Replace(e.Name, ""));
sb.AppendLine("刪除時間：" + DateTime.Now.ToString());
MessageBox.Show(sb.ToString());
}
private void btn_Before_Click(object sender, EventArgs e)
{
ReadTextFile(txtBefore);
}
private void btn_After_Click(object sender, EventArgs e)
{
ReadTextFile(txtAfter);
}
/// <summary>
/// 將文字檔內容顯示於所指定的 TextBox
/// </summary>
/// <param name="p_TextBox">所指定的 TextBox</param>
private void ReadTextFile(TextBox p_TextBox)
{
sb = new StringBuilder();
string[] Txt_All_Lines = System.IO.File.ReadAllLines(@"C:\張小呆文件夾\ABC.txt", Encoding.Default);
foreach (string Single_Line in Txt_All_Lines)
{
sb.AppendLine(Single_Line);
}
p_TextBox.Text = sb.ToString();
}
}
}