Question

C#怎么判断电脑是否联网了？

Answer 1

判断联网有多种方式，最常用的就是ping IP地址，ping IP地址又有多种方式，其中之一，用dos命令，而是用程序，也就是在C#中主要的代码如下主要是用到命令空间 using System.Net.NetworkInformation下的ping类 Ping ping = new Ping();
for (int i = iFrom; i <= iTo; i++)
{
mre1.WaitOne();
string ip = strIP + i.ToString();
label10.Text = "正在扫描主机：" + ip.ToString() ;
try
{
PingReply reply = ping.Send(ip, 100);
if (reply.Status == IPStatus.Success)
{
rtbInfo.AppendText("Host: " + ip.ToString() + "\r");
rtbInfo.ScrollToCaret();
}
}
catch {
rtbInfo.AppendText("发生了一个异常！\r");
}
}
rtbInfo.AppendText("扫描完毕!\r");

Answer 2

c#自带的Ping，using System.Net.NetworkInformation;
Ping ping = new Ping();
for (int i = iFrom; i <= iTo; i++)
{
mre1.WaitOne();
string ip = strIP + i.ToString();
label10.Text = "正在扫描主机：" + ip.ToString() ;
try
{
PingReply reply = ping.Send(ip, 100);
if (reply.Status == IPStatus.Success)
{
rtbInfo.AppendText("Host: " + ip.ToString() + "\r");
rtbInfo.ScrollToCaret();
}
}
catch {
rtbInfo.AppendText("发生了一个异常！\r");
}
}
rtbInfo.AppendText("扫描完毕!\r");

Answer 3

在运行里打入：IPCONFIG /ALL