c#.net启用和禁用本地连接，在线等！。

Question

本帖最后由 happydayandday 于 2009-12-14 09:03:57 编辑

Answer 1

在.net写一个cmd的Process，运行ping，分析数据timeout的话运行ipconfig /release和ipconfig /renew

Answer 2

没试过，你应该可以在下面的文章中找到答案。
http://msdn.microsoft.com/en-us/library/aa394595(VS.85).aspx

Answer 3

刚ipconfig /release 发现本地连接没有禁用，此方法估计无效

Answer 4

private void button4_Click(object sender, EventArgs e)
        {
NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface ni in interfaces)
            {
                string str = String.Format(
                        "Name:\n\t{0}\nDescription:\n\t{1}\nType:\n\t{2}\nStatus:\n\t{3}\nSpeed:\n\t{4}kbps\nSupport Multicast:\n\t{5}",
                        ni.Name, ni.Description, ni.NetworkInterfaceType,
                        ni.OperationalStatus, ni.Speed / 1024, ni.SupportsMulticast);
                MessageBox.Show(str);
                }
            }可以获取所有网卡的信息，其中 OperationalStatus 可判断连接状态，
 你要操作连接可以使用Shell32public bool SetNetworkAdapter(bool status)
        {
            const string discVerb = "停用(&B)";
            const string connVerb = "启用(&A)";
            const string network = "网络连接";
            string networkConnection = "本地连接";
            NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface ni in interfaces)
            {
                string fRegistryKey = "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}\\" + ni.Id + "\\Connection";
                Microsoft.Win32.RegistryKey rk = Microsoft.Win32.Registry.LocalMachine.OpenSubKey(fRegistryKey, false);
                if (rk != null)
                {
                    // 区分 PnpInstanceID    
                    // 如果前面有 PCI 就是本机的真实网卡   
                    // MediaSubType 为 01 则是常见网卡，02为无线网卡。   
                    string fPnpInstanceID = rk.GetValue("PnpInstanceID", "").ToString();
                    int fMediaSubType = Convert.ToInt32(rk.GetValue("MediaSubType", 0));
                    if (fPnpInstanceID.Length > 3 &&
                        fPnpInstanceID.Substring(0, 3) == "PCI")
                    {
                        networkConnection = ni.Name;
                    }
                }
            }            string sVerb;            if (status)
            {
                sVerb = connVerb;
            }
            else
            {
                sVerb = discVerb;
            }            Shell32.Shell sh = new Shell32.Shell();
            Shell32.Folder folder;
            folder = sh.NameSpace(3); 
            try
            {
                //进入控制面板的所有选项   
                foreach (Shell32.FolderItem myItem in folder.Items())
                {
                    //进入网络和拔号连接   
                    if (myItem.Name == network)
                    {
                        Shell32.Folder fd = (Shell32.Folder)myItem.GetFolder;
                        foreach (Shell32.FolderItem fi in fd.Items())
                        {
                            //找到本地连接   
                            if (fi.Name.IndexOf(networkConnection) > -1)
                            {
                                //找本地连接的所有右键功能菜单   
                                foreach (Shell32.FolderItemVerb Fib in fi.Verbs())
                                {
                                    if (Fib.Name == sVerb)
                                    {
                                        Fib.DoIt();
                                        break;
                                    }
                                }
                            }
                        }
                    }
                }
            }
            catch (Exception e)
            {
                e.ToString();
                return false;
            }
            return true;
private void button3_Click(object sender, EventArgs e)
        {
SetNetworkAdapter(true);//启用
}        }

Answer 5

经本地测试 SetNetworkAdapter(true);//启用 SetNetworkAdapter(false);//禁用
都没有什么反应显示信息中有如下Name:
MS TCP Loopback interface Description:
MS TCP Loopback interface Type: Loopback
         Status:Up
Speed: 9765kbps Support 
Multicast:True没有OperationalStatus 想

Answer 6

lz只获取到MS TCP Loopback interface的信息  而没获取到 本地连接 和本地连接1的信息吗？

Answer 7

Status:Up 
-----------
不就是 OperationalStatus 

Answer 8

NetSharingManagerClass netSharingMgr = new NetSharingManagerClass(); INetSharingEveryConnectionCollection connections = netSharingMgr.EnumEveryConnection;
            foreach (INetConnection connection in connections)
            {
                INetConnectionProps connProps = netSharingMgr.get_NetConnectionProps(connection);
                if (connProps.MediaType == tagNETCON_MEDIATYPE.NCM_LAN)
                {
                    connection.Disconnect(); //禁用网络
                    connection.Connect();    //启用网络
                }
            }
禁用启用已经可以了就差第一步.检测外网的一个网站，如www.baidu.com，如果ping不同则实现第2步操作（假死后，估计没法正确读取本地连接的状态） 
请写出代码，怎么知道无法连外网

Answer 9

第一步.检测外网的一个网站，如www.baidu.com[DllImport("wininet.dll")]
        private extern static bool InternetCheckConnection(String url, int flag, int ReservedValue);
        public bool GetExtranet()
        {
            bool extranet = false;
            try
            {
                if (InternetCheckConnection("http://www.baidu.com/", 1, 0).Equals(false))
                {
                    extranet = false;
                }
                else
                {
                    extranet = true;
                }
            }
            catch (Exception e)
            {
                e.ToString();
            }
            return extranet;
        }
第2步操作 本地连接为例string str = null;
            NetworkInterface[] interfaces = NetworkInterface.GetAllNetworkInterfaces();
            foreach (NetworkInterface ni in interfaces)
            {
                
                if (ni.Name == "本地连接")
                {
                    if (ni.OperationalStatus.ToString() == "Up")
                    {
                        str = "已连接本地连接";
                    }
                    else if (ni.OperationalStatus.ToString() == "Down")
                    {
                        str = "本地连接断开";
                    }                  
                }            }

Answer 10

[DllImport("wininet.dll")] 怎么引用，我这无效

Answer 11

using System.Runtime.InteropServices;

Answer 12

不知道为什么 private void Start()
        {
            NetSharingManagerClass netSharingMgr = new NetSharingManagerClass(); INetSharingEveryConnectionCollection connections = netSharingMgr.EnumEveryConnection;
            foreach (INetConnection connection in connections)
            {
                INetConnectionProps connProps = netSharingMgr.get_NetConnectionProps(connection);
                if (connProps.MediaType == tagNETCON_MEDIATYPE.NCM_LAN && connProps.Name == "本地连接")
                {
                    connection.Disconnect(); //禁用网络
                    connection.Connect();    //启用网络
                }
            }
        }
对独立网卡的无效，服务器测试不行，本地可以