C# 判断系统版本

        private static readonly Version _osVersion = Environment.OSVersion.Version;
 
        internal static bool IsOSVistaOrNewer
        {
            get { return _osVersion >= new Version(6, 0); }
        }
 
        internal static bool IsOSWindows7OrNewer
        {
            get { return _osVersion >= new Version(6, 1); }
        }
 
        internal static bool IsOSWindows8OrNewer
        {
            get { return _osVersion >= new Version(6, 2); }
        }