C#获取IIS版本

     　　/// <summary>
        /// 获取IIS版本
        /// </summary>
        /// <returns></returns>
        public static int GetIISVersion()
        {
            DirectoryEntry getEntry = new DirectoryEntry("IIS://localhost/W3SVC/INFO");
            int num = 5;
            try
            {
                num = (int)getEntry.Properties["MajorIISVersionNumber"].Value;
            }
            catch
            {
                return 5;
            }
            switch (num)
            {
                case 6:
                    return 6;

                case 7:
                    return 7;
            }
            return 6;
        }