是否断网

记得大一的时候，一个校园网的几多同学朋友用i，每当自己开着在下载视频教程，然后就去左上课，点知道返来就发现，网又比人地用左，白白浪费滴电

后来就想到用C#做一个判断当前机子是否联网，假如无个话设置关机，米就可以悭翻滴电，环保撒。呵呵

namespace MIS
{
public partial class Close2 : Form
{
System.Net.NetworkInformation.Ping ping;
System.Net.NetworkInformation.PingReply res;

public Close2()
{
InitializeComponent();
}

private void Close2_Load(object sender, EventArgs e)
{
}

private void timer1_Tick(object sender, EventArgs e)
{
ping = new System.Net.NetworkInformation.Ping();
try
{
res = ping.Send("http://www.google.cn/"); //
if (res.Status != System.Net.NetworkInformation.IPStatus.Success)
{
//没有联上Internet哦，做下自己想做个事情咯
timer1.Stop();

MIS.Close.DoExitWin（）; //关机咯
}
}
catch(Exception er)
{
//里你，仲系当你断网咯，做下自己想做个事情咯
timer1.Stop();

MIS.Close.DoExitWin（）; //关机咯
}
}

}
}

//关机程式
using System.Runtime.InteropServices; //
using Microsoft.Win32; //

namespace MIS
{
public class Close
{
/// <summary>
///关闭计算机
/// </summary>
[StructLayout(LayoutKind.Sequential, Pack = 1)]

internal struct TokPriv1Luid
{
public int Count;

public long Luid;

public int Attr;
}

[DllImport("kernel32.dll", ExactSpelling = true)]

internal static extern IntPtr GetCurrentProcess();

[DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]

internal static extern bool OpenProcessToken(IntPtr h, int acc, ref IntPtr phtok);

[DllImport("advapi32.dll", SetLastError = true)]

internal static extern bool LookupPrivilegeValue(string host, string name, ref long pluid);

[DllImport("advapi32.dll", ExactSpelling = true, SetLastError = true)]

internal static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall,

ref TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen);

[DllImport("user32.dll", ExactSpelling = true, SetLastError = true)]

internal static extern bool ExitWindowsEx(int flg, int rea);

internal const int SE_PRIVILEGE_ENABLED = 0x00000002;

internal const int TOKEN_QUERY = 0x00000008;

internal const int TOKEN_ADJUST_PRIVILEGES = 0x00000020;

internal const string SE_SHUTDOWN_NAME = "SeShutdownPrivilege";

internal const int EWX_LOGOFF = 0x00000000;

internal const int EWX_SHUTDOWN = 0x00000001;

internal const int EWX_REBOOT = 0x00000002;

internal const int EWX_FORCE = 0x00000004;

internal const int EWX_POWEROFF = 0x00000008;

internal const int EWX_FORCEIFHUNG = 0x00000010;

public static void DoExitWin()
{
bool ok;

TokPriv1Luid tp;

IntPtr hproc = GetCurrentProcess();

IntPtr htok = IntPtr.Zero;

ok = OpenProcessToken(hproc, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, ref htok);

tp.Count = 1;

tp.Luid = 0;

tp.Attr = SE_PRIVILEGE_ENABLED;

ok = LookupPrivilegeValue(null, SE_SHUTDOWN_NAME, ref tp.Luid);

ok = AdjustTokenPrivileges(htok, false, ref tp, 0, IntPtr.Zero, IntPtr.Zero);

ok = ExitWindowsEx(EWX_SHUTDOWN, 0);
}
}
}