如何检查计算机是否从 C# 响应
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How to check if a computer is responding from C#
提问by ripper234
What is the easiest way to check if a computer is alive and responding (say in ping/NetBios)? I'd like a deterministic method that I can time-limit.
检查计算机是否处于活动状态并做出响应的最简单方法是什么（例如在 ping/NetBios 中）？我想要一种可以限制时间的确定性方法。
One solution is simple access the share (File.GetDirectories(@"\compname")) in a separate thread, and kill the thread if it takes too long.
一种解决方案是在单独的线程中简单地访问共享 (File.GetDirectories(@"\compname"))，并在花费太长时间时终止该线程。
采纳答案by Mehrdad Afshari
Easy! Use System.Net.NetworkInformationnamespace's ping facility!
简单！使用System.Net.NetworkInformation命名空间的 ping 工具！
http://msdn.microsoft.com/en-us/library/system.net.networkinformation.ping.aspx
http://msdn.microsoft.com/en-us/library/system.net.networkinformation.ping.aspx
回答by gimel
To check a specific TCP port (myPort) on a known server, use the following snippet. You can catch the System.Net.Sockets.SocketExceptionexception to indicate non available port.
要检查myPort已知服务器上的特定 TCP 端口 ( )，请使用以下代码段。您可以捕获System.Net.Sockets.SocketException异常以指示不可用的端口。
using System.Net;
using System.Net.Sockets;
...
IPHostEntry myHostEntry = Dns.GetHostByName("myserver");
IPEndPoint host = new IPEndPoint(myHostEntry.AddressList[0], myPort);
Socket s = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
s.Connect(host);
Further, specialized, checks can try IO with timeouts on the socket.
此外，专门的检查可以尝试在套接字上超时的 IO。
回答by SanBen
As long as you want to check a computer within the own subnet you could check it using ARP. Here's an example:
只要您想检查自己子网内的计算机，就可以使用ARP 进行检查。下面是一个例子：
//for sending an arp request (see pinvoke.net)
[DllImport("iphlpapi.dll", ExactSpelling = true)]
public static extern int SendARP(
int DestIP,
int SrcIP,
byte[] pMacAddr,
ref uint PhyAddrLen);
public bool IsComputerAlive(IPAddress host)
{
//can't check the own machine (assume it's alive)
if (host.Equals(IPAddress.Loopback))
return true;
//Prepare the magic
//this is only needed to pass a valid parameter
byte[] macAddr = new byte[6];
uint macAddrLen = (uint)macAddr.Length;
//Let's check if it is alive by sending an arp request
if (SendARP((int)host.Address, 0, macAddr, ref macAddrLen) == 0)
return true; //Igor it's alive!
return false;//Not alive
}
See Pinvoke.netfor more information.
有关更多信息，请参阅Pinvoke.net。
