C# 文件 文件夹

        //判断文件夹(路径)是否存在
        if (Directory.Exists(Path))
        {

        }

        //获取文件大小
        FileInfo file = new FileInfo(labOfPath);
        size += file.Length;

        /// <summary>
        /// 计算文件大小函数(保留两位小数),Size为字节大小
        /// </summary>
        /// <param name="Size">初始文件大小</param>
        /// <returns></returns>
        private static string CountSize(long Size)
        {
            string m_strSize = "";
            long FactSize = 0;
            FactSize = Size;
            if (FactSize < 1024.00)
                m_strSize = FactSize.ToString("F2") + " Byte";
            else if (FactSize >= 1024.00 && FactSize < 1048576)
                m_strSize = (FactSize / 1024.00).ToString("F2") + " K";
            else if (FactSize >= 1048576 && FactSize < 1073741824)
                m_strSize = (FactSize / 1024.00 / 1024.00).ToString("F2") + " M";
            else if (FactSize >= 1073741824)
                m_strSize = (FactSize / 1024.00 / 1024.00 / 1024.00).ToString("F2") + " G";
            return m_strSize;
        }                    

        /// <summary>
        /// 递归获取文件夹的大小(字节)(包含里面的子文件及子文件夹)
        /// </summary>
        /// <param name="size"></param>
        /// <param name="Path"></param>
        /// <returns></returns>
        private static long GetDirectorySize(string Path)
        {
            long size = 0;
            DirectoryInfo di = new DirectoryInfo(Path);
            foreach (FileInfo fi in di.GetFiles())
            {
                size += fi.Length;
            }
            DirectoryInfo[] dis = di.GetDirectories();
            if (dis.Length > 0)
            {
                for (int i = 0; i < dis.Length; i++)
                {
                    size += GetDirectorySize(dis[i].FullName);
                }
            }
            return size;
        }