如何以编程方式确定是否可以使用C＃访问具有给定IP地址的服务器？

解决方案

假设意思是通过TCP套接字：

IPAddress IP;
if(IPAddress.TryParse("127.0.0.1",out IP)){
    Socket s = new Socket(AddressFamily.InterNetwork,
    SocketType.Stream,
    ProtocolType.Tcp);

    try{   
        s.Connect(IPs[0], port);
    }
    catch(Exception ex){
        // something went wrong
    }
}

有关更多信息：http://msdn.microsoft.com/zh-cn/library/4xzx2d41.aspx?ppud=4

声明字符串地址和int端口，我们就可以通过TcpClient类进行连接了。

System.Net.Sockets.TcpClient client = new TcpClient();
try
{
    client.Connect(address, port);
    Console.WriteLine("Connection open, host active");
} catch (SocketException ex)
{
    Console.WriteLine("Connection could not be established due to: \n" + ex.Message);
}
finally
{
    client.Close();
}

这应该做

bool ssl;
ssl = false;
int maxWaitMillisec;
maxWaitMillisec = 20000;
int port = 555;

success = socket.Connect("Your ip address",port,ssl,maxWaitMillisec);

if (success != true) {

    MessageBox.Show(socket.LastErrorText);
    return;
}

我们可以使用Ping类(.net 2.0及更高版本)

Ping x = new Ping();
    PingReply reply = x.Send(IPAddress.Parse("127.0.0.1"));

    if(reply.Status == IPStatus.Success)
        Console.WriteLine("Address is accessible");

我们可能想在生产系统中使用异步方法来允许取消等操作。