c# - 文件系统观察器双条目

Question

我制作了一个小型winforms应用程序来监视某个文件夹中是否有新的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;
        }
    }

Answer 1

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

Common file system operations might raise more than one event. For example, when a file is moved from one directory to another, several OnChanged and some OnCreated and OnDeleted events might be raised. Moving a file is a complex operation that consists of multiple simple operations, therefore raising multiple events. Likewise, some applications (for example, antivirus software) might cause additional file system events that are detected by FileSystemWatcher.