求解决方法:遍历硬盘上所有文件

#Region " - 线程处理"

    Private _t As Thread

    Private Event event_thread_end(ByVal file_info_list() As FileInfo)



    Private Sub background_process(ByVal directory_info As DirectoryInfo)

        Dim di As DirectoryInfo

        Dim directory_name As String

        Dim fi As FileInfo

        Dim fi_list() As FileInfo

        Dim full_file_name As String



        full_file_name = "E:\madaming\Download\m00000001.jpg" ' 

        fi = New FileInfo(full_file_name)

        directory_name = fi.DirectoryName



        di = New DirectoryInfo(directory_name)

        Try



            fi_list = di.GetFiles()

            System.Threading.Thread.Sleep(1000)



            RaiseEvent event_thread_end(fi_list)



        Catch ex As Exception

            RaiseEvent event_thread_exception(ex.Message)

        End Try



    End Sub



    Private Sub Button_start_thread_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_start_thread.Click



        _t = New Thread(AddressOf background_process)

        _t.Start()



    End Sub

''''''''

...



    Private Sub Button_StopThread_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button_StopThread.Click

        _t.Abort()

    End Sub



#End Region

public partial class frmMain : Form

    {

        /// <summary>

        /// 路径

        /// </summary>

        private string m_path;

        /// <summary>

        /// 扩展名

        /// </summary>

        private string m_ext;

        /// <summary>

        /// 文件总数量

        /// </summary>

        private int m_filesCount;

        /// <summary>

        /// 后台线程

        /// </summary>

        private BackgroundWorker m_bgworker = null;

        /// <summary>

        /// 目录信息

        /// </summary>

        private DirectoryInfo m_dirInfo = null;



        private List<string> m_FileNames = new List<string>();



        public frmMain()

        {

            InitializeComponent();

        }



        private void btnOpenPath_Click(object sender, EventArgs e)

        {

            FolderBrowserDialog _fbd = new FolderBrowserDialog();

            _fbd.ShowNewFolderButton = false;

            if (_fbd.ShowDialog(this) == DialogResult.OK)

            {

                txtPath.Text = _fbd.SelectedPath;

            }

        }



        private void btnProcess_Click(object sender, EventArgs e)

        {

            m_FileNames.Clear();

            

            rtxtResult.Text = "";

            m_path = txtPath.Text;

            m_ext = txtExt.Text;

            m_filesCount = 0;

            m_bgworker = new BackgroundWorker();

            m_bgworker.WorkerReportsProgress = true;

            m_bgworker.WorkerSupportsCancellation = true;

            m_bgworker.DoWork += new DoWorkEventHandler(DoWork);

            m_bgworker.ProgressChanged += new ProgressChangedEventHandler(ReportProgress);

            m_bgworker.RunWorkerCompleted+=new RunWorkerCompletedEventHandler(RunWorkerCompleted);

            m_bgworker.RunWorkerAsync();

        }



        private void DoWork(object sender, DoWorkEventArgs dwea)

        {

            BackgroundWorker _worker = sender as BackgroundWorker;

            ErgodicFile(_worker, m_path, m_ext);

        }



        /// <summary>

        /// 遍历指定路径下所有指定扩展名的文件

        /// </summary>

        /// <param name="path">指定路径</param>

        /// <param name="ext">文件扩展名,不包含分隔符(.)</param>

        /// <returns>返回所有文件绝对路径</returns>

        private void ErgodicFile(BackgroundWorker worker, string path, string extension)

        {

            if (worker.CancellationPending)

            {

                return;

            }



            Thread.Sleep(10);

            FileSystemInfo[] _fsi = null;

            try

            {

                m_dirInfo = new DirectoryInfo(path);

                _fsi = m_dirInfo.GetFileSystemInfos();

            }

            catch (Exception ex)

            {

                Console.WriteLine(ex.Message);

                return;

            }



            FileInfo _fi;

            try

            {

                for (int i = 0; i < _fsi.Length && !worker.CancellationPending; i++)

                {

                    if (!Directory.Exists(_fsi[i].FullName))

                    {//是文件

                        _fi = new FileInfo(_fsi[i].FullName);

                        //判断文件扩展名

                        if (m_ext.Length > 0)

                        {//要求扩展名

                            if (_fi.Extension == m_ext)

                            {

                                m_filesCount++;

                                worker.ReportProgress(0, _fi.FullName);

                                m_FileNames.Add(_fi.FullName);

                                Thread.Sleep(10);

                            }

                        }

                        else

                        {

                            worker.ReportProgress(0, _fi.FullName);

                            m_FileNames.Add(_fi.FullName);

                            Thread.Sleep(10);

                        }

                    }

                    else

                    {//是目录,继续遍历

                        ErgodicFile(worker, _fsi[i].FullName, extension);

                        Thread.Sleep(10);

                    }

                    Thread.Sleep(10);

                }

                Thread.Sleep(10);

            }

            catch (Exception ex)

            {

                MessageBox.Show(ex.Message);

            }

        }



        private void RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)

        {

            if(DialogResult.OK==MessageBox.Show("扫描完成，共找到"+m_FileNames.Count+"个文件,点击确定查看","文件扫描完成",MessageBoxButtons.OKCancel))

            {}

        }



        private void ReportProgress(object sender, ProgressChangedEventArgs e)

        {

            string _fileName = e.UserState.ToString();

            rtxtResult.AppendText(_fileName + System.Environment.NewLine);

            rtxtResult.ScrollToCaret();

            lblCount.Text = rtxtResult.Lines.Length.ToString();

        }



        private void btnStop_Click(object sender, EventArgs e)

        {

            if (m_bgworker != null && m_bgworker.WorkerSupportsCancellation)

            {

                m_bgworker.CancelAsync();

            }

        }



        private void btnStart_Click(object sender, EventArgs e)

        {

            btnStart.Enabled = false;

            if (m_FileNames != null && m_FileNames.Count > 0)

            {

                frmFileRead _frm = new frmFileRead(m_FileNames);

                _frm.ShowDialog(this);

            }

            btnStart.Enabled = true;

        }



    }