照着书敲的。留作笔记吧。

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.InteropServices;

namespace _18获取本机磁盘信息

{

    class Program

    {

        static void Main(string[] args)

        {

            GetDiskInfo();

            Console.ReadKey();

        }

        [DllImport("kernel32.dll",EntryPoint="GetDiskFreeSpaceEx")]

        public static extern int GetDiskFreeSpaceEx(string lpDirectory,

            out long lpFreeBytesAvailable,

            out long lpTotalNumberOfBytes,

            out long lpTotalNumberOfFreeBytes);

        public static void GetDiskInfo()

        {

            long fb, ftb, tfb;

            string path = Console.ReadLine();

            if(GetDiskFreeSpaceEx(path, out fb, out ftb, out tfb) != 0)

            {

                string strFb = Convert.ToInt32(fb / 1024 /1024) + "M";

                string strFtb = Convert.ToInt32(ftb / 1024 / 1024) + "M";

                string strTfb = Convert.ToInt32(tfb / 1024 / 1024) + "M";

                Console.WriteLine("总空间：{0}\n可用空间：{1}\n总剩余空间：{2}",strFb, strFtb, strTfb);

            }

        }

    }

}