如何通過「訪問路徑」F：/系統文件卷「被拒絕」異常？

Question

我有一個應用程序讀取構建的程序集目錄中的所有文件和子文件夾，並使用datagridview顯示它。但是當我嘗試在網絡驅動器中運行應用程序以嘗試掃描該驅動器中的文件時，它會發出異常「訪問路徑」F：/系統文件卷「被拒絕」，然後應用程序將停止運行。任何有關如何通過系統文件卷的想法，並仍然顯示可以訪問的文件。這裏是我的代碼，如果需要的話：

 private void Form1_Load(object sender, EventArgs e) 
    { 

     count = 0; 
     timer = new Timer(); 
     timer.Interval = 1000; 
     timer.Tick += new EventHandler(timer1_Tick); 
     timer.Start(); 
     //FileIOPermission permit; 

     try 
     { 
      s1 = Directory.GetFiles(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "*.*", SearchOption.AllDirectories); 
      //permit = new FileIOPermission(FileIOPermissionAccess.AllAccess, s1); 
      //permit.AddPathList(FileIOPermissionAccess.AllAccess, s1); 
      for (int i = 0; i <= s1.Length - 1; i++) 
      { 
       if (i == 0) 
       { 
        dt.Columns.Add("File_Name"); 
        dt.Columns.Add("File_Type"); 
        dt.Columns.Add("File_Size"); 
        dt.Columns.Add("Create_Date"); 
       } 


       FileInfo info = new FileInfo(s1[i]); 
       FileSystemInfo sysInfo = new FileInfo(s1[i]); 
       dr = dt.NewRow(); 

       dr["File_Name"] = sysInfo.Name; 
       dr["File_Type"] = sysInfo.Extension; 
       dr["File_Size"] = (info.Length/1024).ToString(); 
       dr["Create_Date"] = sysInfo.CreationTime.Date.ToString("dd/MM/yyyy"); 
       dt.Rows.Add(dr); 


       if ((info.Length/1024) > 1500000) 
       { 
        MessageBox.Show("" + sysInfo.Name + " had reach its size limit."); 
       } 
      } 

      if (dt.Rows.Count > 0) 
      { 
       dataGridView1.DataSource = dt; 
      } 
     } 

     catch (UnauthorizedAccessException ex) 
     { 
      MessageBox.Show("Error : " + ex.Message); 
      throw; 
     } 

    } 

    private bool IsIgnorable(string dir) 
    { 
     if (dir.EndsWith(":System Volume Information")) return true; 
     if (dir.Contains(":$RECYCLE.BIN")) return true; 
     return false; 
    } 

    private void timer1_Tick(object sender, EventArgs e) 
    { 
      count++; 
      if (count == 60) 
      { 
       count = 0; 
       timer.Stop(); 
       Application.Restart(); 
      } 
    } 

    public string secondsToTime(int seconds) 
    { 
     int minutes = 0; 
     int hours = 0; 

     while (seconds >= 60) 
     { 
      minutes += 1; 
      seconds -= 60; 
     } 
     while (minutes >= 60) 
     { 
      hours += 1; 
      minutes -= 60; 
     } 

     string strHours = hours.ToString(); 
     string strMinutes = minutes.ToString(); 
     string strSeconds = seconds.ToString(); 

     if (strHours.Length < 2) 
      strHours = "0" + strHours; 
     if (strMinutes.Length < 2) 
      strMinutes = "0" + strMinutes; 
     if (strSeconds.Length < 2) 
      strSeconds = "0" + strSeconds; 
     return strHours + ":" + strMinutes + ":" + strSeconds; 
    } 

    private void textBox1_TextChanged(object sender, EventArgs e) 
    { 
     BindingSource bind = new BindingSource(); 
     bind.DataSource = dt; 
     bind.Filter = string.Format("File_Name like '%{0}%'", textBox1.Text.Trim()); 
    } 

Answer 1

你必須創建一個try/catch塊你的循環和處理錯誤等等，每個文件裏，那麼你可以事後繼續循環。

我建議製作功能了吧，下面是一些「空碼」，未經測試，可能的語法錯誤，但我認爲你的想法：

bool GetFileInformation(File f, out string name) 
{ 
    name=null; 
    try 
    { 
     FileInfo info = new FileInfo(f); 
     FileSystemInfo sysInfo = new FileSystemInfo(f); 
     name=sysInfo.Name; 
    } 
    catch(Exception ex) 
    { 
     return false; 
    } 
    return true; 
} 

現在你可以很容易地建立循環圍繞此：

for (int i = 0; i <= s1.Length - 1; i++) 
{ 
    if (GetFileInformation(s1[i], out name) 
    { 
     dr = dt.NewRow(); 
     dr["File_Name"] = name; 
     // .... 

    } 
    }