从所有子目录中随机复制3个文件

Question

我正在使用WinForms。在我的＆＃34; C：\ image \ SourcePath_Folder＆＃34;目录我有多个子文件夹。我想将每个文件夹中的3个文件随机复制到另一个名称相同的目录中。

这是我到目前为止所拥有的。这会将子目录中的所有文件复制到另一个目录。代码不会从每个子文件夹中随机挑选出文件。如何首先选择随机文件，如何将其限制为仅3个文件？

    private void start_btn_Click(object sender, EventArgs e)
    {
        //Create all of the directories 
        foreach (string dirPath in Directory.GetDirectories(@"C:\image\SourcePath_Folder\", "*", SearchOption.AllDirectories))
        {
            Directory.CreateDirectory(dirPath.Replace(@"C:\image\SourcePath_Folder\", Destination_txtbox.Text));
        }
        //Copy all the files & Replaces any files with the same name
        foreach (string newPath in Directory.GetFiles(@"C:\image\SourcePath_Folder\", "*.*", SearchOption.AllDirectories))
        {
            File.Copy(newPath, newPath.Replace(@"C:\image\SourcePath_Folder\", Destination_txtbox.Text), true);
        }
    }

Answer 1

作为一个小命令行版本应该很容易使用...

static void Main(string[] args)
{
  int count = 3;
  string sourcePath = @"C:\image\SourcePath_Folder\";
  string targetPath = @"C:\bar\";

  Random rnd = new Random();
  FileInfo[] randomFiles = new DirectoryInfo(sourcePath).GetFiles("*.*", SearchOption.AllDirectories)
                              .OrderBy(x => rnd.Next()).Take(count).ToArray();

  foreach (FileInfo file in randomFiles)
  {
    string targetFile = Path.Combine(targetPath, file.Name);
    Console.WriteLine("copy " + file.FullName + " -> " + targetFile);
    file.CopyTo(targetFile);
  }
}

使用：

using System;
using System.IO;
using System.Linq;