关于网络连接状态的编程

可以用WMI (Win2K & XP）： (首先要在VS.NET中创建一个项目，然后在添加引用中引用一个.net的装配件：System.Management.dll,这样你的项目才能使用WMI)

with Windows 2000 & XP, UNDOCUMENTED: MSNdis_MediaConnectStatus - NdisMediaConnectStatus : (0 = connected?, 1 = not connected?)

with Windows XP: Win32_NetworkAdapter - NetConnectionStatus :

using System.Management;

static void ReportConnection2000() { ManagementClass mc = new ManagementClass( @"root\WMI", @"MSNdis_MediaConnectStatus", null ); ManagementObjectCollection moc = mc.GetInstances(); foreach( ManagementObject mo in moc ) { string name = (string) mo["InstanceName"]; bool active = (bool) mo["Active"]; uint status = (uint) mo["NdisMediaConnectStatus"]; Console.WriteLine( " {0}\n\tActive:{1} Media Status:{2}", name, active, status ); } }

static void ReportConnectionXP() { ManagementClass mc = new ManagementClass( @"Win32_NetworkAdapter" ); ManagementObjectCollection moc = mc.GetInstances(); foreach( ManagementObject mo in moc ) { string name = (string) mo["Name"]; object val = mo["NetConnectionStatus"]; if( val != null ) Console.WriteLine( " {0}\n\tConnection Status:{1}", name, (ushort) val ); else Console.WriteLine( " {0}\n", name ); } }

如果返回0则表示连接；

如果返回1则表示没连接；

上面得到的是本地的连接状态；

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利用ping来得取：

 		Process p = new Process();			
 		p.StartInfo .WorkingDirectory ="c:\\";
 		p.StartInfo.FileName = "ping.exe";
 		p.StartInfo.Arguments="192.168.52.31";
 		p.StartInfo.UseShellExecute = false;
 		p.StartInfo.RedirectStandardOutput = true;
 		p.StartInfo.CreateNoWindow = true;
 		p.Start ();
 		string output = p.StandardOutput.ReadToEnd();
 		p.WaitForExit ();
 		MessageBox.Show(output);//得到ping的输出值