c#获取本机在局域网ip地址的二种方法_C#教程

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/// <summary>
/// 获取本机在局域网的IP地址
/// </summary>
/// <returns></returns>
private string GetLocalIPAddress()
{
    System.Net.IPAddress[] addressList = Dns.GetHostEntry(Dns.GetHostName()).AddressList;
    string strNativeIP = "";
    string strServerIP = "";
    if (addressList.Length > 1)
    {
strNativeIP = addressList[0].ToString();
strServerIP = addressList[1].ToString();
    }
    else if(addressList.Length==1)
    {
strServerIP = addressList[0].ToString();
    }
    return strServerIP;
}

另外一种就是抓取网页中查询到的上网地址的IP来实现的。实现如下:

/// <summary>
/// 获取本机的上网IP
/// </summary>
/// <returns></returns>
private string GetConnectNetAddress()
{
    string strUrl = "http://www.ip138.com/ip2city.asp"; //获得IP的网址
    Uri uri = new Uri(strUrl);
    WebRequest webreq = WebRequest.Create(uri);
    Stream s = webreq.GetResponse().GetResponseStream();
    StreamReader sr = new StreamReader(s, Encoding.Default);
    string all = sr.ReadToEnd(); //读取网站返回的数据 格式:您的IP地址是:[x.x.x.x]
    int i = all.IndexOf("[") + 1;
    string tempip = all.Substring(i, 15);
    string ip = tempip.Replace("]", "").Replace(" ", "").Replace("<", "");
    return ip;
}

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