C#得到文件夹及文件大小

using  System;
using  System.Text;
using  System.Runtime.InteropServices;
using  System.IO;

namespace  ConsoleApplication1
... {
    /**//// <summary>
    /// Class1 的摘要说明。
    /// </summary>
    class Class1
    ...{
        private DirectoryInfo di;
        private double tcount=0;
        private StringBuilder tname=new StringBuilder();
        /**//**//**//**//**//**//**//// <summary>
        /// 必需的设计器变量。
        /// </summary>

        [DllImport("kernel32")]
        private static extern long WritePrivateProfileString(string section,
            string key,string val,string filePath);
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section,
            string key,string def, StringBuilder retVal,
            int size,string filePath);

        public Class1()
        ...{
            di=new DirectoryInfo("E:/单机游戏/魔兽3/");
            getdir(di);
            if(tcount<1978930000)
                dosth();
        }

        //如果魔兽3不在原目录里。就改配置文件
        public void dosth()
        ...{
            WritePrivateProfileString("Game2","Exe ","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/对战平台/QQ对战平台/QBGames.ini");
            WritePrivateProfileString("Game4","Exe ","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/对战平台/QQ对战平台/QBGames.ini");
            WritePrivateProfileString("Game5","Exe ","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/对战平台/QQ对战平台/QBGames.ini");
            WritePrivateProfileString("游戏参数","魔兽争霸","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/对战平台/VS竞技游戏平台/info/config.ini");
            WritePrivateProfileString("魔兽争霸III","UserExeFile","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/休闲游戏/浩方对战平台/GameClient.ini");
            WritePrivateProfileString("魔兽RPG专区","UserExeFile","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/休闲游戏/浩方对战平台/GameClient.ini");
            WritePrivateProfileString("寒冰王座","UserExeFile","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/休闲游戏/浩方对战平台/GameClient.ini");
            WritePrivateProfileString("魔兽RPG(电信)","UserExeFile","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/对战平台/浩方挤房版/GameClient.ini");
            WritePrivateProfileString("魔兽RPG(网通)","UserExeFile","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/对战平台/浩方挤房版/GameClient.ini");
            WritePrivateProfileString("魔兽竞技场","UserExeFile","E:/单机游戏/魔兽3-冰封王座/war3.exe ","E:/对战平台/浩方挤房版/GameClient.ini");
        }
        
        //取得所有目录里文件的大小 
        public void getdir(DirectoryInfo path)
        ...{
            if(path.Name!="System Volume Information")
            ...{
                DirectoryInfo []dirs=path.GetDirectories();
                FileInfo[] files=path.GetFiles();
                for(int i=0;i<dirs.Length;i++)
                ...{
                    getdir(dirs[i]);
                }
                for(int i=0;i<files.Length;i++)
                ...{
                    tcount+=files[i].Length;
                }
            }
        }

        /**//// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main(string[] args)
        ...{
            //
            // TODO: 在此处添加代码以启动应用程序
            //
            new Class1();
        }
    }
}

 先用ConsoleApplication 写。。再在解决方案中把启动方式改成应用程序就OK！