如何用C#来测试网络通不通！

Question

怎么样判断网络通不通啊？

Answer 1

//先通过.Net提供的类库判断似乎否有网络连接
        public static bool IsAnyNetworkAvailable()
        {
            try
            {
                foreach (NetworkInterface ni in NetworkInterface.GetAllNetworkInterfaces())
                {
                    if (ni.OperationalStatus == OperationalStatus.Up &&
                        ni.NetworkInterfaceType != NetworkInterfaceType.Loopback &&
                        ni.NetworkInterfaceType != NetworkInterfaceType.Tunnel)
                    {
                        IPInterfaceProperties iip = ni.GetIPProperties();
                        if (iip != null && iip.UnicastAddresses != null && iip.UnicastAddresses.Count > 0)
                        {
                            return true;
                        }
                    }
                }
                return false;
            }
            catch
            {
                //如果有异常,直接调用API判断
                return IsInternetConnected();
            }
        }        [DllImport("wininet.dll")]
        private static extern bool InternetGetConnectedState(out int connectionDescription, int reservedValue);        public static bool IsInternetConnected()
        {
            int i;
            return InternetGetConnectedState(out i, 0);
        }

Answer 2

用socket类中的tcpclient连接一下外网某个地址，看能不能连通...当然，这是我的笨办法.

Answer 3

1你要判断网卡 是否连线~~
 if (System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
            {
              
                System.Net.NetworkInformation.NetworkInterface[] _NetFace = System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces();
                foreach (System.Net.NetworkInformation.NetworkInterface _OneNet in _NetFace)
                {
                    MessageBox.Show(_OneNet.OperationalStatus.ToString());
                }            }
            
 2能不能访问外面 你直接socket连接外面的地址就好了

Answer 4

1你要判断网卡 是否连线~~
 if (System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable())
            {
              
                System.Net.NetworkInformation.NetworkInterface[] _NetFace = System.Net.NetworkInformation.NetworkInterface.GetAllNetworkInterfaces();
                foreach (System.Net.NetworkInformation.NetworkInterface _OneNet in _NetFace)
                {
                    MessageBox.Show(_OneNet.OperationalStatus.ToString());
                }            }
            
 2能不能访问外面 你直接socket连接外面的地址就好了

Answer 5

用c# ping
using System;using System.Diagnostics;namespace ZZ{     class ZZConsole     {         [STAThread]         static void Main(string[] args)         {                  string ip = "192.192.132.229";              string strRst = CmdPing(ip);              Console.WriteLine(strRst);              Console.ReadLine();         }         private static string CmdPing(string strIp)         {              Process p = new Process();              p.StartInfo.FileName = "cmd.exe";              p.StartInfo.UseShellExecute = false;              p.StartInfo.RedirectStandardInput = true;              p.StartInfo.RedirectStandardOutput = true;              p.StartInfo.RedirectStandardError = true;              p.StartInfo.CreateNoWindow = true;              string pingrst;              p.Start();              p.StandardInput.WriteLine("ping -n 1 "+strIp);              p.StandardInput.WriteLine("exit");              string strRst = p.StandardOutput.ReadToEnd();              if(strRst.IndexOf("(0% loss)")!=-1)                   pingrst = "连接";              else if( strRst.IndexOf("Destination host unreachable.")!=-1)                   pingrst = "无法到达目的主机";              else if(strRst.IndexOf("Request timed out.")!=-1)                   pingrst = "超时";              else if(strRst.IndexOf("Unknown host")!=-1)                   pingrst = "无法解析主机";              else                   pingrst = strRst;              p.Close();              return pingrst;         }     }}

Answer 6

[DllImport("wininet.dll")]
请问这句话要写在哪啊？怎么提示我说: 找不到类型或命名空间名称“DllImport”(是否缺少 using 指令或程序集引用？)

Answer 7

using System.Runtime.InteropServices;就当函数来写啊

Answer 8

你这还不如用CMD ping 啊 

Answer 9

using System.Runtime.InteropServices; 
namespace internet 
{ public class Class1 
{ 
[DllImport("wininet.dll")] 
private extern static bool InternetGetConnectedState( out int connectionDescription, int     reservedValue ) ; 
public Class1(){} 
private bool IsConnected() 
{ 
int I=0; 
bool state = InternetGetConnectedState(out I,0); 
return state; 
} 
} }