轉自：http://blog.csdn.net/begonia__z/article/details/51733101

這幾天在弄Ipad的項目，我利用了DNs方法獲取Ipad的局域網IP，在PC上并沒有什么問題，但是到了Ipad一直都連不上服務器這里，然后就把IP打印出來，發現IP地址不對的說，DNs好像獲取到的是別的IP地址。
然后我上網查了一下資料找到新的方法，代碼如下：（PS：我順便把Dns的代碼一起放出來，第一個方法好像在PC上也適用，但是安卓和其他平臺我沒有去發布）

/// <summary>  
/// 獲取局域網的IP  
/// </summary>  
/// <returns></returns>  
public string GetAddressIP()  
{  
    string AddressIP = string.Empty;  
    #if UNITY_IPHONE  
    NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces(); ;  
    foreach (NetworkInterface adapter in adapters)  
    {  
        if (adapter.Supports(NetworkInterfaceComponent.IPv4))  
        {  
            UnicastIPAddressInformationCollection uniCast = adapter.GetIPProperties().UnicastAddresses;  
            if (uniCast.Count > 0)  
            {  
                foreach (UnicastIPAddressInformation uni in uniCast)  
                {  
                    //得到IPv4的地址。 AddressFamily.InterNetwork指的是IPv4  
                    if (uni.Address.AddressFamily == AddressFamily.InterNetwork)  
                    {  
                        AddressIP = uni.Address.ToString();  
                    }  
                }  
            }  
        }  
    }  
#endif  
#if UNITY_STANDALONE_WIN  
    ///獲取本地的IP地址  
    foreach (IPAddress _IPAddress in Dns.GetHostEntry(Dns.GetHostName()).AddressList)  
    {  
        if (_IPAddress.AddressFamily.ToString() == "InterNetwork")  
        {  
            AddressIP = _IPAddress.ToString();  
        }  
    }  
#endif  
    return AddressIP;  
}  

記得自己引入using System.Net.NetworkInformation;不然代碼是會有錯誤的
給大家提個醒在項目的編程中盡量別使用foreach，如果想知道為什么直接去百度和谷歌去。

/// <summary>  
/// <span style="font-family: Arial, Helvetica, sans-serif;">獲取局域網的IP</span>  
/// </summary>  
/// <returns></returns>  
public string GetAddressIP()  
{  
    string AddressIP = string.Empty;  
    #if UNITY_IPHONE  
    NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();  
    for (int i = 0; i < adapters.Length; i++)  
    {  
        if (adapters[i].Supports(NetworkInterfaceComponent.IPv4))  
        {  
            UnicastIPAddressInformationCollection uniCast = adapters[i].GetIPProperties().UnicastAddresses;  
            if (uniCast.Count > 0)  
            {  
                for (int j = 0; j < uniCast.Count; j++)  
                {  
                    //得到IPv4的地址。 AddressFamily.InterNetwork指的是IPv4  
                    if (uniCast[j].Address.AddressFamily == AddressFamily.InterNetwork)  
                    {  
                        AddressIP = uniCast[j].Address.ToString();  
                    }  
                }  
            }  
        }  
    }  
#endif  
#if UNITY_STANDALONE_WIN || UNITY_ANDROID  
///獲取本地的IP地址  
    for (int i = 0; i < Dns.GetHostEntry(Dns.GetHostName()).AddressList.Length; i++)  
    {  
         if (Dns.GetHostEntry(Dns.GetHostName()).AddressList[i].AddressFamily.ToString() == "InterNetwork")  
        {  
            AddressIP = Dns.GetHostEntry(Dns.GetHostName()).AddressList[i].ToString();  
        }  
    }  
    //foreach (IPAddress _IPAddress in Dns.GetHostEntry(Dns.GetHostName()).AddressList)  
    //{  
    //    if (_IPAddress.AddressFamily.ToString() == "InterNetwork")  
    //    {  
    //        AddressIP = _IPAddress.ToString();  
    //    }  
    //}  
#endif  
    return AddressIP;  
}