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; }