c#之監控檔案結構

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如果需要知道修改檔案或目錄的時間，可以通過FileSystemWatcher類，這個類提供了一下應用程式可以捕獲的事件，應用程式可以對事件作出響應。

使用FileSystemWatcher非常簡單，首先必須設定一些屬性，指定監控的位置、內容以及引發應用程式要處理事件的時間，然後給FileSystemWatcher提供定製事件處理常式的地址。當事件發生時，FileSystemWatcher就調用這些屬性，然後開啟FileSystemWatcher,等待事件。

1、在啟用FileSystemWatcher對象之前必須設定的屬性：

 

2、設定了屬性之後，必須為4個事件Changed、Created、Deleted、Renamed編寫事件處理常式。

3、設定了屬性和事件後，將EnableRaisingEvents屬性設定為true，就可以開始監控工作了。

 樣本：

建立如下表單：

 

 

表單內容：

代碼：

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace WindowsFormsApplication5{    public partial class Form1 : Form    {        private FileSystemWatcher watcher;        private delegate void updateTextDEL(string text);        public Form1()        {            InitializeComponent();            watcher = new FileSystemWatcher();            watcher.Deleted += watcher_Deleted;            watcher.Renamed += watcher_Renamed;            watcher.Changed += watcher_Changed;            watcher.Created += watcher_Created;        }        public void UpdateText(string text)        {            lbWatch.Text = text;        }        void watcher_Created(object sender, FileSystemEventArgs e)        {            StreamWriter sw = new StreamWriter("log.txt", true);            sw.WriteLine("File:{0} created", e.FullPath);            sw.Close();            this.BeginInvoke(new updateTextDEL(UpdateText), "created");        }        void watcher_Changed(object sender, FileSystemEventArgs e)        {            StreamWriter sw = new StreamWriter("log.txt", true);            sw.WriteLine("File:{0}{1}", e.FullPath, e.ChangeType, ToString());            sw.Close();            this.BeginInvoke(new updateTextDEL(UpdateText), "changed");        }        void watcher_Renamed(object sender, RenamedEventArgs e)        {            StreamWriter sw = new StreamWriter("log.txt", true);            sw.WriteLine("File:renamed from{0}to{1}", e.OldName, e.FullPath);            sw.Close();            this.BeginInvoke(new updateTextDEL(UpdateText), "renamed");        }        void watcher_Deleted(object sender, FileSystemEventArgs e)        {            StreamWriter sw = new StreamWriter("log.txt", true);            sw.WriteLine("File:{0}deleted", e.FullPath);            sw.Close();            this.BeginInvoke(new updateTextDEL(UpdateText), "deleted");        }        private void btnBrowser_Click(object sender, EventArgs e)        {            if(openFileDialog1.ShowDialog()!=DialogResult.Cancel)            {                txbLocatin.Text = openFileDialog1.FileName;            }        }        private void btnWatch_Click(object sender, EventArgs e)        {            watcher.Path = Path.GetDirectoryName(txbLocatin.Text);            watcher.Filter = Path.GetFileName(txbLocatin.Text);            watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.FileName | NotifyFilters                .Size;            lbWatch.Text = "watching" + txbLocatin.Text;            watcher.EnableRaisingEvents = true;        }    }}

 

c#之監控檔案結構