Question

用C#实现实现简单的 Ping 的功能，用于测试网络是否已经联通

Answer 1

C#里有Ping这个类啊。
System.Net.NetworkInformation;

bool online = false; //是否在线
Ping ping = new Ping();
PingReply pingReply = ping.Send("192.168.132.191");
if (pingReply.Status == IPStatus.Success)
{
online = true;
Console.WriteLine("当前在线，已ping通！");
}
else
{
Console.WriteLine("不在线，ping不通！");
}

C# Ping 简单使用 - 海涛的CSDN博客 - 博客频道 - CSDN.NET
http://blog.csdn.net/zht666/article/details/24592021

Answer 2

bool pingable = false;
Ping pinger = new Ping();
try
{
PingReply reply = pinger.Send("192.168.1.1");
pingable = reply.Status == IPStatus.Success;
}
catch (PingException)
{
// Discard PingExceptions and return false;
}

if (pingable)
{
// 可以ping通

}

参考资料：
http://stackoverflow.com/questions/11800958/using-ping-in-c-sharp