Filesystemwatcher double条目

Question

我做了一个小的winforms应用程序来监视某个文件夹中的新PDF文件，如果在particulair文件夹中创建了一个新的pdf文件，它将它复制到另一个位置。

我遇到的问题是filesystemwatcher在我的列表框中创建双/多个条目，我该如何解决？

namespace Scanmonitor 
{ 
    public partial class Form1 : Form 
    { 
     FileSystemWatcher watcher = new FileSystemWatcher(); 
     DateTime lastRead = DateTime.MinValue; 


     public Form1() 
     { 
      InitializeComponent(); 
     } 

     private void Form1_Load(object sender, EventArgs e) 
     { 
      FileWatch(); 
     } 

     public void FileWatch() 
     { 
      watcher.Path = @"C:\Scanner"; 
      watcher.NotifyFilter = NotifyFilters.FileName | NotifyFilters.DirectoryName | NotifyFilters.LastWrite; 
      watcher.Filter = "*.pdf"; 
      watcher.Changed += new FileSystemEventHandler(OnChanged); 
      watcher.EnableRaisingEvents = true; 
     } 

     public void OnChanged(object source, FileSystemEventArgs e) 
     { 
      scannerListBox.Items.Add(e.FullPath); 
      scannerListBox.SelectedIndex = scannerListBox.Items.Count - 1; 
      FileMove(scannerListBox.SelectedItem.ToString()); 
     } 

     public void FileMove(string filePath) 
     { 
      try 
      { 
       System.IO.File.Copy(filePath, @"\\share\Data\Scans op OCE 600\" + Path.GetFileName(filePath)); 
      } 
      catch (Exception ex) 
      { 
       ToolLabel.Text = ex.Message.ToString(); 
      } 
     } 
    } 
} 

}

得到它的工作。

public void OnChanged(object source, FileSystemEventArgs e) 
    { 
     try 
     { 
      watcher.EnableRaisingEvents = false; 
      FileInfo objFileInfo = new FileInfo(e.FullPath); 
      if (!objFileInfo.Exists) return; 
      System.Threading.Thread.Sleep(5000); 

      FileInfo fileinformatie = new FileInfo(e.FullPath); 
      string strCreateTime = fileinformatie.CreationTime.ToString(); 
      string strCreateDate = fileinformatie.CreationTime.ToString(); 

      strCreateTime = strCreateTime.Remove(strCreateTime.LastIndexOf(" ")); 
      strCreateDate = strCreateDate.Remove(0,strCreateDate.LastIndexOf(" ")); 

      ProcessAllFiles(e.FullPath, strCreateTime, strCreateDate); 
     } 
     catch (Exception ex) 
     { 
      ToolLabel.Text = ex.Message.ToString(); 
     } 
     finally 
     { 
      watcher.EnableRaisingEvents = true; 
     } 
    } 

Answer 1

public void OnChanged(object source, FileSystemEventArgs e) 
{ 
    try 
    { 
     watcher.EnableRaisingEvents = false; 
     FileInfo objFileInfo = new FileInfo(e.FullPath); 
     if (!objFileInfo.Exists) return; 
     System.Threading.Thread.Sleep(5000); 

     FileInfo fileinformatie = new FileInfo(e.FullPath); 
     string strCreateTime = fileinformatie.CreationTime.ToString(); 
     string strCreateDate = fileinformatie.CreationTime.ToString(); 

     //Ignore this, only for my file information. 
     strCreateTime = strCreateTime.Remove(strCreateTime.LastIndexOf(" ")); 
     strCreateDate = strCreateDate.Remove(0,strCreateDate.LastIndexOf(" ")); 

     ProcessAllFiles(e.FullPath, strCreateTime, strCreateDate); 
    } 
    catch (Exception ex) 
    { 
     ToolLabel.Text = ex.Message.ToString(); 
    } 
    finally 
    { 
     watcher.EnableRaisingEvents = true; 
    } 
} 

Answer 2

您需要跟踪已由FileSystemWatcher引发事件的文件（在集合或字典中）。根据MSDN

通用文件系统操作可能引发多个事件。例如，当文件从一个目录移动到另一个目录时，可能会引发几个OnChanged和一些OnCreated和OnDeleted事件。移动文件是一项复杂的操作，由多个简单操作组成，因此引发多个事件。同样，某些应用程序（例如防病毒软件）可能会导致由FileSystemWatcher检测到的其他文件系统事件。