using System; using System.Collections.Generic; using System.Text; using System.Runtime.InteropServices; using System.Threading; using System.ComponentModel; namespace mainApp 
...{ 
class RASHelper 
...{ const int INTERNET_RAS_INSTALLED = 0x10; [DllImport("WININET", CharSet = CharSet.Auto)] public static extern bool InternetGetConnectedState( ref int lpdwFlags, int dwReserved); const int MAX_PATH = 260; const int RAS_MaxDeviceType = 16; const int RAS_MaxPhoneNumber = 128; const int RAS_MaxEntryName = 256; const int RAS_MaxDeviceName = 128; const int RAS_Connected = 0x2000; [DllImport("RASAPI32", SetLastError = true, CharSet = CharSet.Auto)] public static extern int RasEnumConnections( [In, Out] RASCONN[] lprasconn, ref int lpcb, ref int lpcConnections); [DllImport("RASAPI32", SetLastError = true, CharSet = CharSet.Auto)] public static extern int RasGetConnectStatus( IntPtr hrasconn, ref RASCONNSTATUS lprasconnstatus); [DllImport("RASAPI32", SetLastError = true, CharSet = CharSet.Auto)] public static extern int RasHangUp(IntPtr hrasconn); [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public struct RASCONN ...{ public int dwSize; public IntPtr hrasconn; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxEntryName + 1)] public string szEntryName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxDeviceType + 1)] public string szDeviceType; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxDeviceName + 1)] public string szDeviceName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = MAX_PATH)] public string szPhonebook; public int dwSubEntry; 
} [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)] public struct RASCONNSTATUS ...{ public int dwSize; public int rasconnstate; public int dwError; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxDeviceType + 1)] public string szDeviceType; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxDeviceName + 1)] public string szDeviceName; [MarshalAs(UnmanagedType.ByValTStr, SizeConst = RAS_MaxPhoneNumber + 1)] public string szPhoneNumber; } /**//// <summary> /// 关闭所有拨号网络链接 /// </summary> public static void HangAllConnection() ...{ int flags = 0; InternetGetConnectedState(ref flags, 0); if (!((flags & INTERNET_RAS_INSTALLED) == INTERNET_RAS_INSTALLED)) throw new NotSupportedException(); //create array of structures to pass to API int ret; int conns = 0; RASCONN[] rarr = new RASCONN[256]; rarr.Initialize(); rarr[0].dwSize = Marshal.SizeOf(typeof(RASCONN)); int lr = rarr[0].dwSize * rarr.Length; //call RasEnumConnections to loop all RAS connections ret = RasEnumConnections(rarr, ref lr, ref conns); if (ret != 0) throw new Win32Exception(ret); //loop through each RASCONN struct for (int i = 0; i < conns; i++) ...{ //retrieve RASCONN struct RASCONN r = rarr[i]; //if connection bad, handle will be 0 if (r.hrasconn == IntPtr.Zero) continue; RasHangUp(r.hrasconn); } } } 
}
