网页判断是手机浏览器登录还是电脑浏览器

public static bool CheckAgent()
{
bool flag = false;
string agent = HttpContext.Current.Request.UserAgent;
string[] keywords = { "Android", "iPhone", "Windows Phone", "MQQBrowser" };
//排除 Windows 桌面系统    苹果桌面系统
if (!agent.Contains("Windows NT") && !agent.Contains("Macintosh"))
{
foreach (string item in keywords)
{
if (agent.Contains(item))
{
flag = true;
break;
}
}
}
return flag;
}