网络（NET）帮助类

public class Net
	{
		/// <summary>
		/// 获取Ip
		/// </summary>
		public static string Ip
		{
			get
			{
				string text = string.Empty;
				bool flag = HttpContext.Current != null;
				if (flag)
				{
					text = Net.GetWebClientIp();
				}
				bool flag2 = string.IsNullOrWhiteSpace(text);
				if (flag2)
				{
					text = Net.GetLanIp();
				}
				return text;
			}
		}
		/// <summary>
		/// 获取主机名
		/// </summary>
		public static string Host
		{
			get
			{
				return (HttpContext.Current == null) ? Dns.GetHostName() : Net.GetWebClientHostName();
			}
		}
		/// <summary>
		/// 获取浏览器信息
		/// </summary>
		public static string Browser
		{
			get
			{
				bool flag = HttpContext.Current == null;
				string result;
				if (flag)
				{
					result = string.Empty;
				}
				else
				{
					HttpBrowserCapabilities browser = HttpContext.Current.Request.Browser;
					result = string.Format("{0} {1}", browser.Browser, browser.Version);
				}
				return result;
			}
		}
		/// <summary>
		/// 获取Web客户端的Ip
		/// </summary>
		private static string GetWebClientIp()
		{
			string webRemoteIp = Net.GetWebRemoteIp();
			IPAddress[] hostAddresses = Dns.GetHostAddresses(webRemoteIp);
			string result;
			for (int i = 0; i < hostAddresses.Length; i++)
			{
				IPAddress iPAddress = hostAddresses[i];
				bool flag = iPAddress.AddressFamily == AddressFamily.InterNetwork;
				if (flag)
				{
					result = iPAddress.ToString();
					return result;
				}
			}
			result = string.Empty;
			return result;
		}
		/// <summary>
		/// 获取Web远程Ip
		/// </summary>
		private static string GetWebRemoteIp()
		{
			return HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] ?? HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
		}
		/// <summary>
		/// 获取局域网IP
		/// </summary>
		private static string GetLanIp()
		{
			IPAddress[] hostAddresses = Dns.GetHostAddresses(Dns.GetHostName());
			string result;
			for (int i = 0; i < hostAddresses.Length; i++)
			{
				IPAddress iPAddress = hostAddresses[i];
				bool flag = iPAddress.AddressFamily == AddressFamily.InterNetwork;
				if (flag)
				{
					result = iPAddress.ToString();
					return result;
				}
			}
			result = string.Empty;
			return result;
		}
		/// <summary>
		/// 获取Web客户端主机名
		/// </summary>
		private static string GetWebClientHostName()
		{
			bool flag = !HttpContext.Current.Request.IsLocal;
			string result;
			if (flag)
			{
				result = string.Empty;
			}
			else
			{
				string webRemoteIp = Net.GetWebRemoteIp();
				string hostName = Dns.GetHostEntry(IPAddress.Parse(webRemoteIp)).HostName;
				bool flag2 = hostName == "localhost.localdomain";
				if (flag2)
				{
					hostName = Dns.GetHostName();
				}
				result = hostName;
			}
			return result;
		}
	}