C#實現網際網路共用

using System;using System.Runtime.InteropServices;namespace ConApp{    class RemoteShareDir    {        [DllImport("Netapi32.dll",CharSet=CharSet.Unicode)]        private static extern uint NetShareAdd(            [MarshalAs(UnmanagedType.LPWStr)] string strServer,            Int32 dwLevel,            ref SHARE_INFO_502 buf,            out uint parm_err        );        [DllImport("Netapi32.dll",CharSet= CharSet.Unicode )]        private static extern uint NetShareDel(string host, string shareName, int reserved);        public RemoteShareDir()        {        }        public uint SetShareDir(string host, string dir, string shareName, string shareDesc)        {            SHARE_INFO_502 info = new SHARE_INFO_502();            info.shi502_netname = shareName;            info.shi502_type = SHARE_TYPE.STYPE_DISKTREE;            info.shi502_remark = shareDesc;            info.shi502_permissions = 0;    // ignored for user-level security            info.shi502_max_uses = -1;            info.shi502_current_uses = 0;    // ignored for set            info.shi502_path = dir;            info.shi502_passwd = null;        // ignored for user-level security            info.shi502_reserved = 0;            info.shi502_security_descriptor = IntPtr.Zero;            uint error = 0;            return NetShareAdd(host, 502, ref info, out error);        }        public uint DeleteShareDir(string host, string shareName)        {            return NetShareDel(host, shareName, 0);        }        private enum NetError : uint        {            NERR_Success = 0,            NERR_BASE = 2100,            NERR_UnknownDevDir = (NERR_BASE + 16),            NERR_DuplicateShare = (NERR_BASE + 18),            NERR_BufTooSmall = (NERR_BASE + 23),        }        private enum SHARE_TYPE : uint        {            STYPE_DISKTREE = 0,            STYPE_PRINTQ = 1,            STYPE_DEVICE = 2,            STYPE_IPC = 3,            STYPE_TEMPORARY = 0x40000000,            STYPE_SPECIAL = 0x80000000,        }        [StructLayout(LayoutKind.Sequential)]        private struct SHARE_INFO_502        {            [MarshalAs(UnmanagedType.LPWStr)]            public string shi502_netname;            public SHARE_TYPE shi502_type;            [MarshalAs(UnmanagedType.LPWStr)]            public string shi502_remark;            public Int32 shi502_permissions;            public Int32 shi502_max_uses;            public Int32 shi502_current_uses;            [MarshalAs(UnmanagedType.LPWStr)]            public string shi502_path;            [MarshalAs(UnmanagedType.LPWStr)]            public string shi502_passwd;            public Int32 shi502_reserved;            public IntPtr shi502_security_descriptor;        }    }}