在 C# 中检查网络状态
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Checking network status in C#
提问by Brian Clark
How do I check that I have an open network connection and can contact a specific ip address in c#? I have seen example in VB.Net but they all use the 'My' structure. Thank you.
如何检查我是否有一个开放的网络连接并且可以在 c# 中联系特定的 ip 地址？我在 VB.Net 中看到过示例，但它们都使用“我的”结构。谢谢你。
采纳答案by Yona
If you just want to check if the network is up then use:
如果您只想检查网络是否已启动，请使用：
bool networkUp
= System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable();
To check a specific interface's status (or other info) use:
要检查特定接口的状态（或其他信息），请使用：
NetworkInterface[] networkCards
= System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces();
To check the status of a remote computer then you'll have to connect to that computer (see other answers)
要检查远程计算机的状态，您必须连接到该计算机（请参阅其他答案）
回答by Lasse V. Karlsen
Well, you would try to connect to the specific ip, and handle denies and timeouts.
好吧，你会尝试连接到特定的 ip，并处理拒绝和超时。
Look at the TcpClient class in the System.Net.Sockets namespace.
查看 System.Net.Sockets 命名空间中的 TcpClient 类。
回答by Patrick Desjardins
First suggestion (IP connection)
第一个建议（IP连接）
You can try to connect to the IP address using something like:
您可以尝试使用以下方法连接到 IP 地址：
IPEndPoint ipep = new IPEndPoint(Ipaddress.Parse("IP TO CHECK"), YOUR_PORT_INTEGER);
Socket server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
server.Connect(ipep);
I suggest you to the check code of a "Chat" program. These programs manipulate a lot of IP connections and will give you a good idea of how to check if an IP is available.
我建议您查看“聊天”程序的校验码。这些程序会操纵大量 IP 连接，并会让您很好地了解如何检查 IP 是否可用。
Second suggestion (Ping)
第二个建议（Ping）
You can try to ping. Here is a good tutorial. You will only need to do:
你可以试试ping。这是一个很好的教程。您只需要执行以下操作：
Ping netMon = new Ping();
PingResponse response = netMon.PingHost(hostname, 4);
if (response != null)
{
ProcessResponse(response);
}
回答by tamberg
If you're interested in the HTTP status code, the following works fine:
如果您对 HTTP 状态代码感兴趣，以下内容可以正常工作：
using System;
using System.Net;
class Program {
static void Main () {
HttpWebRequest req = WebRequest.Create(
"http://www.oberon.ch/") as HttpWebRequest;
HttpWebResponse rsp;
try {
rsp = req.GetResponse() as HttpWebResponse;
} catch (WebException e) {
if (e.Response is HttpWebResponse) {
rsp = e.Response as HttpWebResponse;
} else {
rsp = null;
}
}
if (rsp != null) {
Console.WriteLine(rsp.StatusCode);
}
}
}
Regards, tamberg
问候，坦贝格
回答by CCrawford
If you want to monitor for changes in the status, use the System.Net.NetworkInformation.NetworkChange.NetworkAvailabilityChangedevent:
如果要监视状态的变化，请使用System.Net.NetworkInformation.NetworkChange.NetworkAvailabilityChanged事件：
NetworkChange.NetworkAvailabilityChanged
+= new NetworkAvailabilityChangedEventHandler(NetworkChange_NetworkAvailabilityChanged);
_isNetworkOnline = NetworkInterface.GetIsNetworkAvailable();
// ...
void NetworkChange_NetworkAvailabilityChanged(object sender, NetworkAvailabilityEventArgs e)
{
_isNetworkOnline = e.IsAvailable;
}
回答by akuma6099
My idea was to have a static class/Module to do the monitoring on a spereate thread. A simple DNS resolve will ensure if your network is up and running. Beats ping IMO.
我的想法是有一个静态类/模块来对一个单独的线程进行监控。一个简单的 DNS 解析将确保您的网络是否正常运行。击败 ping IMO。
Imports System.Net
Public Module Network_Monitor
Private InsideWorkNet As Boolean = vbFalse
Private Online_Status As Boolean = vbFalse
Private CurrentWorkIPAddress As New IPHostEntry
Private WithEvents Timer_Online_Check As New Timers.Timer With {.Interval = 5000, .Enabled = True, .AutoReset = True}
Public ReadOnly Property GetOnlineStatus() As String
Get
Return Online_Status
End Get
End Property
Public Sub Initialize()
Set_Online_Status()
Timer_Online_Check.Start()
End Sub
Public Sub Set_Online_Status()
If My.Computer.Network.IsAvailable Then
Try
Dim DNSTest As IPHostEntry = Dns.GetHostEntry("google.com")
If DNSTest.AddressList.Length > 0 Then
Online_Status = True
Else : Online_Status = False
End If
Catch ex As System.Net.Sockets.SocketException
Online_Status = False
End Try
End If
End Sub
Private Sub Timer_Online_Check_Elaspsed(ByVal sender As Object, ByVal e As Timers.ElapsedEventArgs) Handles Timer_Online_Check.Elapsed
Set_Online_Status()
End Sub
Public Sub Detect_Work_Network()
If Online_Status = True Then
Dim WorkIP As IPHostEntry = New IPHostEntry()
Try
WorkIP = Dns.GetHostEntry("serverA.myworkdomain.local")
If WorkIP.AddressList.Length > 0 Then
InsideWorkNet = True
CurrentWorkIPAddress = WorkIP
'MessageBox.Show(WorkIP.HostName.ToString(), "WorkIP", MessageBoxButtons.OK, MessageBoxIcon.Information)
End If
Catch ex As Sockets.SocketException
Try
WorkIP = Dns.GetHostEntry("serverA.myworkdomain.com")
If WorkIP.AddressList.Length > 0 Then
InsideWorkNet = False
CurrentWorkIPAddress = WorkIP
' MessageBox.Show(WorkIP.HostName.ToString(), "WorkIP", MessageBoxButtons.OK, MessageBoxIcon.Information)
End If
Catch ey As Sockets.SocketException
End Try
End Try
End If
End Sub
Public Function GetWorkServerName() As String
If InsideWorkNet = True Then
Return "serverA.myworkdomain.local"
Else : Return "serverA.myworkdomain.com"
End If
End Function
End Module
I also had to determine if I was inside or outside of my work network. Different servers on each side of the firewall for the app to talk to.
我还必须确定我是在工作网络内部还是外部。防火墙每一侧的不同服务器供应用程序通信。
回答by Amit Kumawat
You can check network status using
您可以使用检查网络状态
if(System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
{
//Do your stuffs when network available
}
else
{
//Do stuffs when network not available
}
