关于在WinCE应用程序中实现关机和重启的功能
最近在开发WinCE应用程序过程中，想实现在程序中控制设备重启和关机的功能。通过查询资料，尝试通过调用kernel32.dll，advapi32.dll和user32.dll中函数实现。相关代码及函数如下： 
这是引入动态链接库代码： 
[DllImport("kernel32.dll", EntryPoint = "GetCurrentProcess", SetLastError = true)] 
public static extern IntPtr GetCurrentProcess(); 

[DllImport("advapi32.dll" , SetLastError = true)] 
public static extern bool OpenProcessToken(IntPtr h, int acc, ref IntPtr phtok ); 

[DllImport("advapi32.dll", SetLastError = true)] 
public static extern bool LookupPrivilegeValue(string host, string name, ref long pluid ); 

[DllImport("advapi32.dll", SetLastError = true) ] 
public static extern bool AdjustTokenPrivileges(IntPtr htok, bool disall, 
ref TokPriv1Luid newst, int len, IntPtr prev, IntPtr relen); 

[DllImport("user32.dll", SetLastError = true) ] 
public static extern bool ExitWindowsEx(int flg, int rea); 


public const int EWX_LOGOFF = 0x00000000; // 注消 
public const int EWX_SHUTDOWN = 0x00000001; // 先保存再关机 
public const int EWX_REBOOT = 0x00000002; // 重启 
public const int EWX_FORCE = 0x00000004;//终止没响应程序 
public const int EWX_POWEROFF = 0x00000008;//强制关机 
public const int EWX_FORCEIFHUNG = 0x00000010;//不保存就关机 
实现关机和重启的主要函数： 
private void DoExitWin( int flg) 
{ 
bool send; 
  TokPriv1Luid tp; 
IntPtr hproc = GetCurrentProcess(); 
IntPtr htok = IntPtr.Zero; 
send = OpenProcessToken(hproc,TOKEN_ADJUST_PRIVILEGES |TOKEN_QUERY,ref htok ); 
tp.Count = 1; 
tp.Luid = 0; 
tp.Attr = SE_PRIVILEGE_ENABLED; 
send = LookupPrivilegeValue(null,SE_SHUTDOWN_NAME,ref tp.Luid); 
send= AdjustTokenPrivileges(htok,false,ref tp,0,IntPtr.Zero,IntPtr.Zero); 
send = ExitWindowsEx(flg,0); 
} 

应用程序上关机操作相应函数 
private void button_Close_Click(object sender, System.EventArgs e) 
{ 
DoExitWin(EWX_POWEROFF); 
} 

每次执行到红色字体表示的代码部分都会抛出一个System.MissingMethodException异常，请问怎么解决，高些答谢！

------解决方案--------------------
ExitWindowsEx只有Windows Mobile 5以上才支持，另外PPC只能用它重启，SP才可以关机...

WinCE应该用KernelIoControl，一个简单例子...

C# code

[DllImport('Coredll.dll')]
extern static int KernelIoControl(int dwIoControlCode, IntPtr lpInBuf, int nInBufSize, IntPtr lpOutBuf, int nOutBufSize, ref int lpBytesReturned);
[DllImport('Coredll.dll')]
extern static void SetCleanRebootFlag();

public void HardReset()
{
int IOCTL_HAL_REBOOT = 0x101003C;
int bytesReturned = 0;
SetCleanRebootFlag();
KernelIoControl(IOCTL_HAL_REBOOT,IntPtr.Zero,0, IntPtr.Zero, 0, ref bytesReturned);
}

------解决方案--------------------
LZ用的PC上的Win32API集，WinCE下一般是这个Coredll.dll，具体可以查MSDN，可以查到对应的API