FileSystemWatcher停止捕獲事件

Question

我正在寫一個c＃程序讓我知道何時添加或刪除了一個文件。我在我的Windows 7機器上運行它並在我們的網絡上觀看FTP服務器。

它工作正常，但會突然停止捕捉任何事件。我猜測它可能會失去與服務器的連接，或者網絡出現故障。

我該如何處理代碼中的這種情況。是否有一些例外我可以觀察並嘗試重新啓動FileSystemWatcher對象。

任何建議和代碼示例將不勝感激。

Answer 1

上一個答案沒有完全解決它，我不得不重置觀察者，而不僅僅是打開和關閉它。 我用FileSystemWatcher的一個窗口服務

void NotAccessibleError(FileSystemWatcher source, ErrorEventArgs e) 
{ 
    int iMaxAttempts = 120; 
    int iTimeOut = 30000; 
    int i = 0; 
    while ((!Directory.Exists(source.Path) || source.EnableRaisingEvents == false) && i < iMaxAttempts) 
    { 
     i += 1; 
     try 
     { 
      source.EnableRaisingEvents = false; 
      if (!Directory.Exists(source.Path)) 
      { 
       MyEventLog.WriteEntry("Directory Inaccessible " + source.Path + " at " + DateTime.Now.ToString("HH:mm:ss")); 
       System.Threading.Thread.Sleep(iTimeOut); 
      } 
      else 
      { 
       // ReInitialize the Component 
       source.Dispose(); 
       source = null; 
       source = new System.IO.FileSystemWatcher(); 
       ((System.ComponentModel.ISupportInitialize)(source)).BeginInit(); 
       source.EnableRaisingEvents = true; 
       source.Filter = "*.tif"; 
       source.Path = @"\\server\dir"; 
       source.NotifyFilter = System.IO.NotifyFilters.FileName; 
       source.Created += new System.IO.FileSystemEventHandler(fswCatchImages_Changed); 
       source.Renamed += new System.IO.RenamedEventHandler(fswCatchImages_Renamed); 
       source.Error += new ErrorEventHandler(OnError); 
       ((System.ComponentModel.ISupportInitialize)(source)).EndInit(); 
       MyEventLog.WriteEntry("Try to Restart RaisingEvents Watcher at " + DateTime.Now.ToString("HH:mm:ss")); 
      } 
     } 
     catch (Exception error) 
     { 
      MyEventLog.WriteEntry("Error trying Restart Service " + error.StackTrace + " at " + DateTime.Now.ToString("HH:mm:ss")); 
      source.EnableRaisingEvents = false; 
      System.Threading.Thread.Sleep(iTimeOut); 
     } 
    } 
} 

Answer 2

我需要添加一個錯誤處理程序FileSystemWatcher的

fileSystemWatcher.Error += new ErrorEventHandler(OnError); 

然後添加以下代碼：

private void OnError(object source, ErrorEventArgs e) 
{ 
    if (e.GetException().GetType() == typeof(InternalBufferOverflowException)) 
    { 
     txtResults.Text += "Error: File System Watcher internal buffer overflow at " + DateTime.Now + "\r\n"; 
    } 
    else 
    { 
     txtResults.Text += "Error: Watched directory not accessible at " + DateTime.Now + "\r\n"; 
    } 
    NotAccessibleError(fileSystemWatcher ,e); 
} 

這是我如何重置SystemFileWatcher對象：

static void NotAccessibleError(FileSystemWatcher source, ErrorEventArgs e) 
    { 
     source.EnableRaisingEvents = false; 
     int iMaxAttempts = 120; 
     int iTimeOut = 30000; 
     int i = 0; 
     while (source.EnableRaisingEvents == false && i < iMaxAttempts) 
     { 
      i += 1; 
      try 
      { 
       source.EnableRaisingEvents = true; 
      } 
      catch 
      { 
       source.EnableRaisingEvents = false; 
       System.Threading.Thread.Sleep(iTimeOut); 
      } 
     } 

    } 

我認爲這段代碼應該做我想做的事情。