File.OpenRead()目录、子目录、文件，然后将文件夹和文件写入另一个目录

using System.IO;

public class DirectoryCopyExample
{
    public static void Main()
    {
        string sourceDirectory = "C:\\SourceDirectory";
        string targetDirectory = "C:\\TargetDirectory";

        // 复制目录及其内容
        CopyDirectory(sourceDirectory, targetDirectory);
    }

    public static void CopyDirectory(string sourceDirectory, string targetDirectory)
    {
        // 创建目标目录
        Directory.CreateDirectory(targetDirectory);

        // 复制子目录
        foreach (string subDirectory in Directory.GetDirectories(sourceDirectory))
        {
            string subDirectoryName = Path.GetFileName(subDirectory);
            string subDirectoryTarget = Path.Combine(targetDirectory, subDirectoryName);
            CopyDirectory(subDirectory, subDirectoryTarget);
        }

        // 复制文件
        foreach (string file in Directory.GetFiles(sourceDirectory))
        {
            string fileName = Path.GetFileName(file);
            string fileTarget = Path.Combine(targetDirectory, fileName);
            File.Copy(file, fileTarget);
        }
    }
}