获取用户电脑的上网IP地址

在项目中经常要获取用户的上网的IP地址，如何获取用户的IP地址，方法很多，现在介绍以下2种。

/// <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;

}