实时检测网络状态及是否可以连接Internet-白红宇

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Net.NetworkInformation;

using System.Runtime.InteropServices;

namespace NetWork

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

NetworkChange.NetworkAvailabilityChanged += new NetworkAvailabilityChangedEventHandler(NetworkChange_NetworkAvailabilityChanged);

NetworkChange.NetworkAddressChanged+=new NetworkAddressChangedEventHandler(NetworkChange_NetworkAddressChanged);

}

public void NetworkChange_NetworkAddressChanged(object sender, EventArgs e)

{

NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();

foreach (NetworkInterface n in adapters)

{

if(n.NetworkInterfaceType!= NetworkInterfaceType.Loopback)

Console.WriteLine("Changed {0} is {1}", n.Name, n.OperationalStatus);

}

Console.WriteLine("NetState : " + NetState());

}

public void NetworkChange_NetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)

{

Console.WriteLine("IsAvailable : "+e.IsAvailable);

Console.WriteLine("NetState : " + NetState());

}

[DllImport("wininet.dll")]

public static extern bool InternetGetConnectedState(out long lpdwFlags, long dwReserved);

public static bool NetState()

{

//string url = http://www.baidu.com/;

//if (url.StartsWith("http://")) url = url.Remove(0, "http://".length/);

//try

//{

// System.Net.IPHostEntry ipHost = System.Net.Dns.GetHostEntry(url);// System.Net.Dns.Resolve(url);

// return true;

//}

//catch //(System.Net.Sockets.SocketException se)

//{

// //System.Diagnostics.Trace.Write(se.Message);

// return false;

//}

try

{

long lfag;

if (InternetGetConnectedState(out lfag, 0))

{

return true;

}

return false;

}

catch

{

return false;

}

本文转自94cool博客园博客，原文链接：http://www.cnblogs.com/94cool/archive/2009/08/14/1546286.html，如需转载请自行联系原作者