前提条件:你必须添加System.Data.Linq引用并引用它

using System.Linq;
string ipAddress ="";
IPHostEntry ipHostInfo = Dns.GetHostEntry(Dns.GetHostName());
ipAddress = Convert.ToString(ipHostInfo.AddressList.FirstOrDefault(address => address.AddressFamily == AddressFamily.InterNetwork));

只是我使用LINQ的更新版本:

/// <summary>
/// Gets the local Ipv4.
/// </summary>
/// <returns>The local Ipv4.</returns>
/// <param name="networkInterfaceType">Network interface type.</param>
IPAddress GetLocalIPv4(NetworkInterfaceType networkInterfaceType)
{
    var networkInterfaces = NetworkInterface.GetAllNetworkInterfaces().Where(i => i.NetworkInterfaceType == networkInterfaceType && i.OperationalStatus == OperationalStatus.Up);

    foreach (var networkInterface in networkInterfaces)
    {
        var adapterProperties = networkInterface.GetIPProperties();

        if (adapterProperties.GatewayAddresses.FirstOrDefault() == null)
                continue;
        foreach (var ip in networkInterface.GetIPProperties().UnicastAddresses)
        {
            if (ip.Address.AddressFamily != AddressFamily.InterNetwork)
                    continue;

            return ip.Address;
        }
    }

    return null;
}

下面是一个修改后的版本(来自compman2408的版本)，它对我来说很有效:

    internal static string GetLocalIPv4(NetworkInterfaceType _type)
    {  // Checks your IP adress from the local network connected to a gateway. This to avoid issues with double network cards
        string output = "";  // default output
        foreach (NetworkInterface item in NetworkInterface.GetAllNetworkInterfaces()) // Iterate over each network interface
        {  // Find the network interface which has been provided in the arguments, break the loop if found
            if (item.NetworkInterfaceType == _type && item.OperationalStatus == OperationalStatus.Up)
            {   // Fetch the properties of this adapter
                IPInterfaceProperties adapterProperties = item.GetIPProperties();
                // Check if the gateway adress exist, if not its most likley a virtual network or smth
                if (adapterProperties.GatewayAddresses.FirstOrDefault() != null)
                {   // Iterate over each available unicast adresses
                    foreach (UnicastIPAddressInformation ip in adapterProperties.UnicastAddresses)
                    {   // If the IP is a local IPv4 adress
                        if (ip.Address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork)
                        {   // we got a match!
                            output = ip.Address.ToString();
                            break;  // break the loop!!
                        }
                    }
                }
            }
            // Check if we got a result if so break this method
            if (output != "") { break; }
        }
        // Return results
        return output;
    }

你可以像这样调用这个方法:

GetLocalIPv4(NetworkInterfaceType.Ethernet);

变化:我正在从一个适配器中检索IP，该适配器已分配了一个网关IP。 第二个变化:我添加了文档字符串和break语句，以使该方法更有效。

@mrcheif我今天找到了这个答案，这是非常有用的，虽然它确实返回了一个错误的IP(不是由于代码不工作)，但它给出了错误的互联网IP，当你有这样的东西，如Himachi运行。

public static string localIPAddress()
{
    IPHostEntry host;
    string localIP = "";
    host = Dns.GetHostEntry(Dns.GetHostName());

    foreach (IPAddress ip in host.AddressList)
    {
        localIP = ip.ToString();

        string[] temp = localIP.Split('.');

        if (ip.AddressFamily == AddressFamily.InterNetwork && temp[0] == "192")
        {
            break;
        }
        else
        {
            localIP = null;
        }
    }

    return localIP;
}

我知道这可能是白费力气，但也许这能帮到别人。我到处寻找一种方法来找到我的本地IP地址，但我发现到处都说要使用:

Dns.GetHostEntry(Dns.GetHostName());

I don't like this at all because it just gets all the addresses assigned to your computer. If you have multiple network interfaces (which pretty much all computers do now-a-days) you have no idea which address goes with which network interface. After doing a bunch of research I created a function to use the NetworkInterface class and yank the information out of it. This way I can tell what type of interface it is (Ethernet, wireless, loopback, tunnel, etc.), whether it is active or not, and SOOO much more.

public string GetLocalIPv4(NetworkInterfaceType _type)
{
    string output = "";
    foreach (NetworkInterface item in NetworkInterface.GetAllNetworkInterfaces())
    {
        if (item.NetworkInterfaceType == _type && item.OperationalStatus == OperationalStatus.Up)
        {
            foreach (UnicastIPAddressInformation ip in item.GetIPProperties().UnicastAddresses)
            {
                if (ip.Address.AddressFamily == AddressFamily.InterNetwork)
                {
                    output = ip.Address.ToString();
                }
            }
        }
    }
    return output;
}

现在要获取以太网接口的IPv4地址:

GetLocalIPv4(NetworkInterfaceType.Ethernet);

或者你的无线接口:

GetLocalIPv4(NetworkInterfaceType.Wireless80211);

如果您试图获取无线接口的IPv4地址，但您的计算机没有安装无线卡，它将只返回一个空字符串。以太网接口也是如此。

编辑:

It was pointed out (thanks @NasBanov) that even though this function goes about extracting the IP address in a much better way than using Dns.GetHostEntry(Dns.GetHostName()) it doesn't do very well at supporting multiple interfaces of the same type or multiple IP addresses on a single interface. It will only return a single IP address when there may be multiple addresses assigned. To return ALL of these assigned addresses you could simply manipulate the original function to always return an array instead of a single string. For example:

public static string[] GetAllLocalIPv4(NetworkInterfaceType _type)
{
    List<string> ipAddrList = new List<string>();
    foreach (NetworkInterface item in NetworkInterface.GetAllNetworkInterfaces())
    {
        if (item.NetworkInterfaceType == _type && item.OperationalStatus == OperationalStatus.Up)
        {
            foreach (UnicastIPAddressInformation ip in item.GetIPProperties().UnicastAddresses)
            {
                if (ip.Address.AddressFamily == AddressFamily.InterNetwork)
                {
                    ipAddrList.Add(ip.Address.ToString());
                }
            }
        }
    }
    return ipAddrList.ToArray();
}

现在，这个函数将返回指定接口类型的所有分配地址。现在要获得单个字符串，可以使用. firstordefault()扩展名返回数组中的第一项，如果数组为空，则返回空字符串。

GetLocalIPv4(NetworkInterfaceType.Ethernet).FirstOrDefault();

此外，只是获取客户端Ip的简单代码:

        public static string getclientIP()
        {
            var HostIP = HttpContext.Current != null ? HttpContext.Current.Request.UserHostAddress : "";
            return HostIP;
        }

希望对你有所帮助。