FileSystem Watcher触发多个事件

Question

好像我的文件系统观察程序正在触发多个事件然后最终给我一个错误：

  

进程无法访问文件，文件正在使用中。

这是我的代码：

 private void button1_Click(object sender, EventArgs e)
    {
       // Form2 popup = new Form2();
        if (Directory.Exists(this.textBox2.Text) && string.IsNullOrWhiteSpace(textBox2.Text))
        {
            MessageBox.Show("Please Select Source Folder");
            return;
        }

        else if (Directory.Exists(this.textBox3.Text) && string.IsNullOrWhiteSpace(textBox3.Text))
        {
            MessageBox.Show("Please Select Destination Folder");
            return;

        }
        else  WatchFile();

private void WatchFile(/*string watch_folder*/)
    {
        FileSystemWatcher _watcher = new FileSystemWatcher();

        _watcher.Path = textBox2.Text;




        _watcher.NotifyFilter = NotifyFilters.LastWrite;
        _watcher.Filter = "*.log";

        _watcher.Changed += new FileSystemEventHandler(InitList);
        _watcher.EnableRaisingEvents = true;
        _watcher.IncludeSubdirectories = false;


        listBox1.Items.Add("Started Monitoring Directory " + textBox2.Text);
        listBox1.SelectedIndex = listBox1.Items.Count - 1;
    }

    private  object lockObject = new Object();

    public  void InitList(object source, FileSystemEventArgs f)
    {
        _recordList = new List<MyData>();


        string fileName = f.FullPath;
        string filePath = f.Name;
        string trPath = fileName;
        string[] arrstringPath = new string[3];
        arrstringPath[0] = filePath.Substring(2, 2);
        arrstringPath[1] = filePath.Substring(4, 2);
        arrstringPath[2] = filePath.Substring(6, 2);
        string tempPath = "LG" + arrstringPath[0] + arrstringPath[1] + arrstringPath[2] + ".001";
        string v15nativePath = textBox3.Text + tempPath;

        _watcher.EnableRaisingEvents = false;

        if (!Monitor.TryEnter(lockObject))
        {
            return;
        }
        else
        try
        {

            //_watcher.EnableRaisingEvents = false;
            _watcher.Changed -= new FileSystemEventHandler(InitList);

            FileStream trFS = new FileStream(trPath, FileMode.Open, FileAccess.Read);
            StreamReader trSR = new StreamReader(trFS);

            //  FileStream v15FS = new FileStream(v15nativePath, FileMode.Open, FileAccess.Write);
            StreamWriter v15SR = new StreamWriter(v15nativePath, false);





            var timeIndex = "S";
            Func<string, MyData> values = new Func<string, MyData>(
                     (x) =>
                     {


                         if ((x[0].ToString()) == "S")
                         {

                             var temptime = x.IndexOf("S");
                             timeIndex = x.Substring(temptime + 1, 4);

                         }



                         if ((x[0].ToString()) == "C")
                         {
                             var trackIndex = x.IndexOf(":");

                             var titleidString = x.Substring(11, 6);
                             var trackString = x.Substring(17, 40);
                             var trackDuration = x.Substring(57, 5);

                             return new MyData { Time = timeIndex, Duration = trackDuration, TitleID = titleidString, Track = trackString };



                         }
                         else
                             return null;

                     });




            while (trSR.Peek() != -1)
            {
                var data = trSR.ReadLine();


                MyData my = values(data);
                if (my != null)
                    _recordList.Add(my);


            }
            trFS.Close();
            trSR.Close();

            var groupData = from data in _recordList
                            select new
                            {
                                Name = data.Track,
                                Duration = data.Duration,
                                Time = data.Time,
                                ID = data.TitleID

                            };



            foreach (var item in groupData)
            {
                                    var newstringLen = item.Name.Truncate(27);
                var v15timeString = item.Duration;
                var v15fileString = "C" + item.Time + ":" + "00" + item.ID + "         " + newstringLen + v15timeString;
            v15SR.WriteLine(v15fileString);
                v15SR.Flush();


            }
            v15SR.Close();


            this.Invoke((MethodInvoker)delegate { listBox1.Items.Add(string.Format("File is Translated")); });

            _watcher.Changed += new FileSystemEventHandler(InitList);
        }
        catch (Exception e)
        {
            //listBox1.Items.Add("The process failed: "+" "+e.ToString());.
            MessageBox.Show("The Process Failed:" + e.ToString());


        }
        finally
        {
            Monitor.Exit(lockObject);
            _watcher.Path = textBox2.Text;

            _watcher.EnableRaisingEvents = true;
            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();



        }



    }

我在try块之前调用了_watcher.EnableRaisingEvents = false;，然后在最后一个块中将其设置为true。在我进行处理时看着get被禁用了，为什么它在完成后再次运行InitList方法。这似乎是在同一个文件上运行多次，因此导致此异常