后端开发|C#.Net教程
C#，IP
后端开发-C#.Net教程
本文主要介绍了C# 获取IP及判断IP是否在区间的方法。具有很好的参考价值，下面跟着小编一起来看下吧
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话不多说，请看代码：
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/// /// public static string GetClientIpAddress() {var httpContext = HttpContext.Current;if (httpContext.Request.ServerVariables == null){ return null;}var clientIp = httpContext.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] ??httpContext.Request.ServerVariables["REMOTE_ADDR"];try{ foreach (var hostAddress in Dns.GetHostAddresses(clientIp)) {if (hostAddress.AddressFamily == AddressFamily.InterNetwork){ return hostAddress.ToString();} } foreach (var hostAddress in Dns.GetHostAddresses(Dns.GetHostName())) {if (hostAddress.AddressFamily == AddressFamily.InterNetwork){ return hostAddress.ToString();} }}catch (Exception ex){}return clientIp; } /// /// /// /// public static Boolean ipExistsInRange(String ip, String ipSection) { ipSection = ipSection.Trim(); ip = ip.Trim(); int idx = ipSection.IndexOf(-); String beginIP = ipSection.Substring(0, idx); String endIP = ipSection.Substring(idx + 1); return getIp2long(beginIP) <= getIp2long(ip) && getIp2long(ip) <= getIp2long(endIP); } public static long getIp2long(String ip) { ip = ip.Trim(); String[] ips = ip.Split(.); long ip2long = 0L; for (int i = 0; i < 4; ++i) {ip2long = ip2long << 8 | Int64.Parse(ips[i]); } return ip2long; } public static long getIp2long2(String ip) { ip = ip.Trim(); String[] ips = ip.Split(.); long ip1 = Int64.Parse(ips[0]); long ip2 = Int64.Parse(ips[1]); long ip3 = Int64.Parse(ips[2]); long ip4 = Int64.Parse(ips[3]); long ip2long = 1L * ip1 * 256 * 256 * 256 + ip2 * 256 * 256 + ip3 * 256 + ip4; return ip2long; }
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