.NET获取客户端的操作系统版本、浏览器版本和IP地址

/// <summary>
/// 获取操作系统的名字
/// </summary>
/// <param name="userAgent"></param>
/// <returns></returns>
public static string GetOSNameByUserAgent(string userAgent)
{
 string osVersion = "未知";

 if (userAgent.Contains("NT 10.0"))
 {
 osVersion = "Windows 10";
 }
 else if (userAgent.Contains("NT 6.3"))
 {
 osVersion = "Windows 8.1";
 }
 else if (userAgent.Contains("NT 6.2"))
 {
 osVersion = "Windows 8";
 }
 else if (userAgent.Contains("NT 6.1"))
 {
 osVersion = "Windows 7";
 }
 else if (userAgent.Contains("NT 6.1"))
 {
 osVersion = "Windows 7";
 }
 else if (userAgent.Contains("NT 6.0"))
 {
 osVersion = "Windows Vista/Server 2008";
 }
 else if (userAgent.Contains("NT 5.2"))
 {
 if (userAgent.Contains("64"))
 osVersion = "Windows XP";
 else
 osVersion = "Windows Server 2003";
 }
 else if (userAgent.Contains("NT 5.1"))
 {
 osVersion = "Windows XP";
 }
 else if (userAgent.Contains("NT 5"))
 {
 osVersion = "Windows 2000";
 }
 else if (userAgent.Contains("NT 4"))
 {
 osVersion = "Windows NT4";
 }
 else if (userAgent.Contains("Me"))
 {
 osVersion = "Windows Me";
 }
 else if (userAgent.Contains("98"))
 {
 osVersion = "Windows 98";
 }
 else if (userAgent.Contains("95"))
 {
 osVersion = "Windows 95";
 }
 else if (userAgent.Contains("Mac"))
 {
 osVersion = "Mac";
 }
 else if (userAgent.Contains("Unix"))
 {
 osVersion = "UNIX";
 }
 else if (userAgent.Contains("Linux"))
 {
 osVersion = "Linux";
 }
 else if (userAgent.Contains("SunOS"))
 {
 osVersion = "SunOS";
 }
 else
 {
 osVersion = System.Web.HttpContext.Current.Request.Browser.Platform;
 }
 return osVersion;
}

/// <summary>
/// 获取当前客户端Ip地址
/// </summary>
/// <returns></returns>
public static string GetCurrentUserHostAddress()
{
 string userHostAddress = "";
 userHostAddress = System.Web.HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
 if (string.IsNullOrEmpty(userHostAddress))
 {
 //没有代理IP则直接取连接客户端IP 
 userHostAddress = System.Web.HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
 }
 return userHostAddress;
}