C# 批量复制文件到新路径并修改文件名

static void Main(string[] args)
        {
            Console.WriteLine("将去除前缀字符：[normal-]和后缀");
        
            Console.WriteLine("请输入需要新文件存放夹路径:");
            string newpath = Console.ReadLine();
        chek:
            Console.WriteLine("请输入需要修改文件夹路径：");
            string oldpath = Console.ReadLine();

            if (oldpath != null)
            {
                if (!System.IO.Directory.Exists(oldpath))
                {
                    Console.WriteLine("文件夹不存在！");
                    goto chek;
                }
                var paths = oldpath.Split('\\');
                var time = Convert.ToDateTime(paths[paths.Length - 1]);
                var pathtime = newpath + "\\" + time.Year.ToString() + "\\" + time.Month.ToString() + "\\" + time.Day.ToString();

                if (!System.IO.Directory.Exists(pathtime))
                {
                    System.IO.Directory.CreateDirectory(pathtime);
                }

                DirectoryInfo root = new DirectoryInfo(oldpath);
                FileInfo[] files = root.GetFiles();
                foreach (var item in files)
                {
                    //删除后缀
                    var name = item.Name.Replace(item.Extension, "");
                    //删除指定前缀
                    var newname = name.Replace("normal-", "");
                    Console.WriteLine(item.Name + ">>" + newname);
                    //复制并修改文件名
                    //需要注意文件重复会报错
                    newpath = pathtime + "\\" + newname;
                    if (!File.Exists(newpath))
                    {
                        File.Copy(item.FullName, newpath);
                    }
                    else
                    {
                        Console.WriteLine(newname + "该文件重复！");
                    }
                }

            }

            goto chek;
        }