C#将文件从一个文件夹复制到另一个文件夹而不重复

Question

Im trying to copy files from "source" folder to my "destination" folder, without duplicates. I cant use destination folder to compare as it will eventually get deleted from there. I had gotten help here to make a batch file

Robocopy "source" "destination" "*chr.txt*" "*hdr.txt*" /M

that uses attribute to keep track of files copy before. However I need to do this in C# instead. I know theres command to copy

System.IO.File.Copy(sourceFile, destFile, true);

but not sure how to go about being specific on file name "*chr.txt" and taking care of duplicates.

Answer 1

我需要在 C# 中执行此操作

Process.Start("robocopy", "source destination chr.txt hdr.txt /M");

Answer 2

Here is a method I created a while ago that has worked well for me (aside from the checking for duplicates part that I just added and haven't tested). Let me know if any parts of it do not work for what you need.

private static void CopyDirectory(string from, string to)
{
    var toFileNames = new DirectoryInfo(to)
        .GetFiles()
        .Select(f => f.Name)
        .ToList();

    var directory = new DirectoryInfo(from);
    var files = directory.GetFiles();
    foreach (var file in files)
        if (!toFileNames.Contains(file.Name))
            file.CopyTo(Path.Combine(to, file.Name));

    var subDirectories = directory.GetDirectories();
    foreach (var subDirectory in subDirectories)
    {
        var newDirectory = Directory.CreateDirectory(Path.Combine(to, subDirectory.Name));
        CopyDirectory(subDirectory.FullName, newDirectory.FullName);
    }
}