1. 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( @"rootWMI", @"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}ntActive:{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}ntConnection 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；==========================================================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