C# 拷贝目录

    public class DirectoryExtends
    {
        /// <summary>
        /// 拷贝目录
        /// </summary>
        /// <param name="oldpath">源目录</param>
        /// <param name="newpath">新目录</param>
        public static void CopyDirectory(string oldpath, string newpath)
        {
            if (string.IsNullOrWhiteSpace(newpath)) return;
            var folderName = oldpath.Substring(oldpath.LastIndexOf("\", StringComparison.Ordinal) + 1);
            var desfolderdir = newpath + "\" + folderName;
            if (newpath.LastIndexOf("\", StringComparison.Ordinal) == (newpath.Length - 1))
            {
                desfolderdir = newpath + folderName;

            }
            var filenames = Directory.GetFileSystemEntries(oldpath);
            foreach (string file in filenames)
            {
                if (Directory.Exists(file))
                {
                    var currentdir = desfolderdir + "\" + file.Substring(file.LastIndexOf("\", StringComparison.Ordinal) + 1);
                    if (!Directory.Exists(currentdir))
                    {
                        Directory.CreateDirectory(currentdir);

                    }
                    CopyDirectory(file, desfolderdir);
                }
                else
                {
                    var srcfileName = file.Substring(file.LastIndexOf("\", StringComparison.Ordinal) + 1);
                    srcfileName = desfolderdir + "\" + srcfileName;
                    if (!Directory.Exists(desfolderdir))
                    {
                        Directory.CreateDirectory(desfolderdir);
                    }
                    File.Copy(file, srcfileName,true);
                }
            }
        }

    }