C#判断useragent是pc还是手机端

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public static bool CheckAgent(string userAgent)         {             bool flag = false;             string[] keywords = { "Android", "iPhone", "iPod", "iPad", "Windows Phone", "MQQBrowser"};             //排除 Windows 桌面系统             if (!userAgent.Contains("Windows NT") || (userAgent.Contains("Windows NT") && userAgent.Contains("compatible; MSIE 9.0;")))             {                 //排除 苹果桌面系统                 if (!userAgent.Contains("Windows NT") && !userAgent.Contains("Macintosh"))                 {                     foreach (string item in keywords)                     {                         if (userAgent.Contains(item))                         {                             flag = true;                             break;                         }                     }                 }                 flag = true;             }             return flag;         }