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;
    }
}