C# FileSystemWatcher Copy folder complete

问题

I am using FileSystemWatcher to monitor a folder that will be used to do some file renaming.
The only thing that will be copied will be folders containing files. There will not be single files put into the monitored folder. This is the code for setting up the FileSystemWatcher

watcher.Path = path;
watcher.NotifyFilter = NotifyFilters.DirectoryName | NotifyFilters.FileName;
watcher.IncludeSubdirectories = true;
watcher.Filter = "*.*";
watcher.Created += new FileSystemEventHandler(watcher_Created);
watcher.Changed += new FileSystemEventHandler(watcher_Changed);
watcher.Renamed += new RenamedEventHandler(watcher_Renamed);
watcher.EnableRaisingEvents = true;

There doesn't seem to be any issues with this setup..

The folders being copied can be between 50-200mb big. Is there a way to check/make sure that all the files have completed copying before starting the renaming process. I tried this thinking that i would get an IOException if the copying was still happening when the GetFiles() was called.

bool finishedCopying = false;
while (!finishedCopying)
{
    try
    {
        List<FileInfo> fileList = directoryInfo.GetFiles().ToList();
        AlbumSearch newAlbum = new AlbumSearch(directoryInfo);
        return newAlbum;
    }
    catch (IOException)
    {
        finishedCopying = false;
    }
}

If anymore information is required, just ask an i can provide.

Ta.

回答1:

This is a small demo app that check files at the beginning, and then uses two hashsets to track copied files. This will only work if the source directory is known. There is no way to know if a file was created from a file copy or from a direct creation, so you can only compare two known directories with Directory.GetFiles. And, as already said in comments, you will still have to check if during the copy process, other files were added / removed / renamed in the old directory

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static HashSet<string> oldDirFiles = new HashSet<string>();
        static HashSet<string> newDirFiles = new HashSet<string>();

        static string oldDir = "C:\\New Folder";
        static string newDir = "C:\\New Folder 2";

        static System.Threading.ManualResetEvent resetEvent = new System.Threading.ManualResetEvent(false);

        static void Main(string[] args)
        {
            System.IO.FileSystemWatcher watcher = new System.IO.FileSystemWatcher();
            watcher.Path = newDir;
            watcher.NotifyFilter = NotifyFilters.DirectoryName | NotifyFilters.FileName;
            watcher.IncludeSubdirectories = true;
            watcher.Filter = "*.*";
            watcher.Created += watcher_Created;
            watcher.Changed += watcher_Changed;
            watcher.Renamed += watcher_Renamed;
            watcher.EnableRaisingEvents = true;

            //get all files in old directory
            var oldFiles = Directory.GetFiles(oldDir, "*.*", SearchOption.AllDirectories);
            foreach (var file in oldFiles)
                oldDirFiles.Add(file);

            resetEvent.WaitOne();

            //now launch the directory copy

            //then you have to check if in the meaning time, new files were added or renamed
            //that could be done also with a watcher in the old directory
        }

        static void watcher_Renamed(object sender, RenamedEventArgs e)
        {
            throw new NotImplementedException();
        }

        static void watcher_Changed(object sender, FileSystemEventArgs e)
        {
            throw new NotImplementedException();
        }

        static void watcher_Created(object sender, FileSystemEventArgs e)
        {
            //check if the copied file was in the old directory before starting
            if (oldDirFiles.Contains(e.FullPath.Replace(newDir, oldDir)))
            {
                newDirFiles.Add(e.FullPath);
                //if all the files have been copied, the file count will be the same in the two hashsets
                //the resetevent.Set() signal the waiting thread and the program can proceed
                if (newDirFiles.Count == oldDirFiles.Count)
                    resetEvent.Set();
            }
        }
    }
}

回答2:

I gave this a go using a timer. It may not be the prettiest solution out there but at first testing it seems to be working so far. Essentially what this does is when a folder is copied to the monitored folder it will add the folder path to the AlbumList. The files in that folder will trigger the Created event. This waits for the file to finish copying. Once finished it starts a timer. If a new Created event gets triggered the timer will reset itself.

When the timer.elapsed event is triggered it assumes (and I know assumption is the mother of all f*&k ups) that there are no more files to be copied and can start to process the fully copied folder..

System.Timers.Timer eventTimer = new System.Timers.Timer(); 
List<string> AlbumList = new List<string>();

private void watcher_Created(object sender, FileSystemEventArgs e)
{    
    if (Directory.Exists(e.FullPath))
    {
        AlbumList.Add(e.FullPath);
    }

    if (File.Exists(e.FullPath))
    {
        eventTimer.Stop();
        FileInfo newTrack = new FileInfo(e.FullPath);
        while (IsFileLocked(newTrack))
        {
            // File is locked. Do Nothing..
        }
        eventTimer.Start();              
    }
}

private void eventTimer_Elapsed(object sender, ElapsedEventArgs e)
{
    List<string> ItemToRemove = new List<string>();
    foreach (var item in AlbumList)
    {            
        DirectoryInfo di = new DirectoryInfo(item);
        AlbumSearch newAlbum = new AlbumSearch(di);

        if (DoSomethingMethod(newAlbum))
        {
            ItemToRemove.Add(item);
        }
        else
        {
            // why did it fail
        }
    }

    foreach (var path in ItemToRemove)
    {
        AlbumList.Remove(path);
    }
}

private bool DoSomethingMethod(AlbumSearch as)
{
    // Do stuff here 
    return true;
}

来源：https://stackoverflow.com/questions/32678108/c-sharp-filesystemwatcher-copy-folder-complete

标签

filesystemwatcher

copying