asp.net C#判断电脑是否可以上网

作者：袖梨 2022-06-25

方法一

代码如下

复制代码

public bool CheckForInternetConnection()
{
bool result = false;

    try
    {
        Ping ping = new Ping();
        PingReply replay = ping.Send("114.114.114.114", 2000);
        if (replay.Status == IPStatus.Success)
        {
result = true;
        }
    }
    catch { }

return result;
}

方法二

代码如下

复制代码

public bool CheckForInternetConnection()
{
bool result = false;

    try
    {
        using (WebClient client = new WebClient())
        {
client.DownloadString("http://www.111com.net/");
result = true;
        }
    }
    catch { }

return result;
}

方法三

代码如下

复制代码

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");