How to get list file in directory except those files is being pasted

Question

I want to get a list of files in a directory except those files being pasted, but my code doesn't work:

static List<string> getListFile(string directory)
{
    List<string> listFile = new List<string>();
    string[] filePaths = Directory.GetFiles(directory);
    foreach (string s in filePaths)
    {
        FileInfo fileInfo = new FileInfo(s);
        long size1 = fileInfo.Length;
        Thread.Sleep(2000);
        fileInfo = new FileInfo(s);
        long size2 = fileInfo.Length;
        if (size1 == size2)//This is always true
        {
            listFile.Add(s);
        }
    }
    return listFile;
}

Answer 1

I don't think files being copied will be listed if the targetd directory is the destination, so your safe-check is worthless.

Edit: given the further explaining of the author, if you want to check if a file is being copied, use the exception to do so:

 foreach (string s in filePaths)
                {
                    try
                    {
                        using (FileStream fileStream = new FileStream(s, FileMode.Open, FileAccess.Read))
                        {
                            //Do no thing
                            listFile.Add(s);
                        }
                    }
                    catch
                    {
                      // file can't access, because it is being used by another process(pasteing).
                    }
                }

Original answer