System.IO.IOException thrown when trying to get file names

Question

I'm trying to calculate the total size of all the files in which last write time is earlier than 10 minutes from now in a specified directory which has a large amount of data. Here goes the code I've tried below:

DateTime from_date = DateTime.Now.AddMinutes(-10);
List<string> list = Directory.GetFiles(@[PATH], "*", SearchOption.AllDirectories)               
            .Where(x => File.GetLastWriteTime(x).Date > from_date)
            .Select(x => new FileInfo(x).FullName)
            .ToList();            

foreach (String s in list)
{
    FileInfo file = new FileInfo(s);
    size += file.Length;
}

button6.Text = ((size / 1024f) / 1024f) + "MB";

This works when I specify a local path, but throws me a Network name no longer available IOException when specifying a network path. Why does it happen? Is there a way where I can kind of "hold" the network path or make sure the connection to this path will not fail?

Answer 1

DirectoryInfo.EnumerateFiles() and DirectoryInfo.EnumerateDirectories are the best option.

var directories = new DirectoryInfo(root).EnumerateDirectories().OrderByDescending(d => d.Name);
IEnumerable<FileInfo> files;

foreach (DirectoryInfo directoryInfo in directories)
{
    files = directoryInfo
        .EnumerateFiles("*" + extension, SearchOption.AllDirectories)
        .OrderByDescending(f => f.LastWriteTime);
    foreach (FileInfo f in files)
    {
        if ((f.LastWriteTime.CompareTo(DateTime.Now.AddMinutes(-10)) == 1)
        {
            // Do whatever you want with the files
        }
    }
}