Filesystemwatcher double entries

本文关键字：entries double Filesystemwatcher | 更新日期: 2023-09-27 18:29:09

我制作了一个小型winforms应用程序来监控某个文件夹中的新pdf文件，如果在特定文件夹中创建了新的pdf文件，它会将其复制到其他位置。

我遇到的问题是，文件系统观察程序在我的列表框中创建了两个/多个条目，我该如何解决这个问题？

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();
            }
        }
    }
}

}

成功了。

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;
        }
    }

Filesystemwatcher double entries

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

常见的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事件以及一些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，因此会引发多个事件。同样，某些应用程序（例如防病毒软件）可能会导致FileSystemWatcher检测到的其他文件系统事件。

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;
    }
}
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