文件监控

利用FileSystemWatcher类对文件的写、重命名、新建进行监控以及执行触发的事件，并记录对文件进行了什么操作。

代码如下：

public partial class Form1 : Form
    {
        private FileSystemWatcher watcher;
        private delegate void UpdateWatcherTextDelegate(string operationLog);//为异步调用执行委托里面的方法
        public Form1()
        {
            InitializeComponent();
            this.watcher = new FileSystemWatcher();
            this.watcher.Deleted += new FileSystemEventHandler(this.OnDelete);
            this.watcher.Changed += new FileSystemEventHandler(this.OnChange);
            this.watcher.Created += new FileSystemEventHandler(this.OnCreate);
            this.watcher.Renamed += new RenamedEventHandler(this.OnRename);
        }

        public void UpdateWatchText(string text) 
        {
            label1.Text = text;
        }

        public void OnDelete(object source, FileSystemEventArgs e) 
        {
            EventData("Write a delete log to text", e);
        }
     
        public void OnChange(object source, FileSystemEventArgs e)
        {
            EventData("Write a change log to text", e);
        }

        public void OnRename(object source, RenamedEventArgs e)
        {
            EventData("Write a rename log to text",e);
        }

        public void OnCreate(object source, FileSystemEventArgs e)
        {
            EventData("Write a create log to text", e);
        }

        private void EventData(string strWrite, FileSystemEventArgs e)
        {
            FileStream fs = new FileStream("Log.txt", FileMode.OpenOrCreate, FileAccess.ReadWrite);
            StreamWriter sw = new StreamWriter(fs, Encoding.UTF8);
            try
            {
                sw.WriteLine(string.Format("File:{0},{1}", e.FullPath, e.ChangeType.ToString()));
                sw.Close();
                this.BeginInvoke(new UpdateWatcherTextDelegate(UpdateWatchText), strWrite);
            }
            catch (IOException io)
            {
                this.BeginInvoke(new UpdateWatcherTextDelegate(UpdateWatchText), "Error have happened:" + io.ToString());
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            if (openFileDialog1.ShowDialog() == DialogResult.OK) 
            {
                textBox1.Text = openFileDialog1.FileName;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.watcher.Path = Path.GetDirectoryName(textBox1.Text);
            this.watcher.Filter = Path.GetFileName(textBox1.Text);
            watcher.NotifyFilter = NotifyFilters.LastWrite | NotifyFilters.LastAccess | NotifyFilters.FileName | NotifyFilters.Size;
            this.watcher.EnableRaisingEvents = true;
        }

        
    }