将多个文件添加到目录时,FileSystemWatcher会出现文件访问错误

lock (lockObject)
{
    // 执行文件操作
}

FileSystemWatcher watcher = new FileSystemWatcher();
watcher.Path = @"C:\folder\";
watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
    | NotifyFilters.FileName | NotifyFilters.DirectoryName;
watcher.Filter = "*.txt";
watcher.Changed += new FileSystemEventHandler(OnChanged);
watcher.Created += new FileSystemEventHandler(OnChanged);
watcher.Deleted += new FileSystemEventHandler(OnChanged);
watcher.Renamed += new RenamedEventHandler(OnRenamed);
watcher.EnableRaisingEvents = true;

async Task ProcessFilesAsync()
{
    string[] files = Directory.GetFiles(@"C:\folder\");
    foreach (string file in files)
    {
        using (FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
        {
            // 处理文件
        }
    }
}