using system;using system.threading;
using system.runtime.interopservices;
namespace network
static networkhelper()
public static networkhelper getnetworkhelperinstance()
/// /// 檢查網路是否連通，有延遲
///
///
///
[dllimport("wininet.dll")]
private extern static bool internetgetconnectedstate(out int connectiondescription, int reservedvalue);
/// ///
///
/// 連線餓位址
/// flag_icc_force_connection
/// 0
[dllimport("wininet.dll")]
private extern static bool internetcheckconnection(string lpszurl, int dwflags, int dwreserved);
/// /// 檢查網路是否連通,需要啟動服務
///
///
[dllimport("sensapi.dll")]
private extern static bool isnetworkalive(out int connectiondescription);
/// /// 檢查是否能建立internet連線，vista不可用
///
///
/// 0
[dllimport("sensapi.dll")]
private extern static bool isdestinationreachable(string dest, intptr ptr);
/// /// 網際網路是否可用
///
///
public bool isinternetalive()
else
return false;
//}//else
// return false;
}return false;
}/// ///
///
///
public int checkintertnet()
else
return 0;
//}//else
// return false;
}return 0;
}/// /// 為networkstatuschanged事件處理程式提供資料
///
public class networkchangedeventargs : eventargs
public networkchangedeventargs(int status)
public bool isnetworkalive
private set
}public int isnetworkalive_int32
private set }}
/// /// 表示networkstatuschanged事件的方法
///
public delegate void networkchangedeventhandler(object sender, networkchangedeventargs e);
/// /// 網路狀態變更時觸發的事件
///
public event networkchangedeventhandler networkstatuschanged;
/// /// 網路狀態變更時觸發的事件
///
private void onnetworkstatuschanged(networkchangedeventargs e)
/// /// 監聽網路狀態
///
public void listennetworkstatus(synchronizationcontext context)
, null);
//onnetworkstatuschanged(new networkchangedeventargs(currentstatus));}}
, autoevent
, 0, listen_time_span);
false);
}/// /// 監聽網路狀態
///
public void listennetworkstatus(synchronizationcontext context, bool? b)
, null);}}
, autoevent
, 0, listen_time_span);
autoevent.waitone(5000, false);
}/// /// 停止監聽網路狀態
///
public void closelistennetworkstatus()
}#endregion
}
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