[DllImport("kernel32.dll",EntryPoint="GetSystemPowerStatus")]   //win32 api        private static extern void GetSystemPowerStatus(ref SYSTEM_POWER_STATUS lpSystemPowerStatus);            public struct SYSTEM_POWER_STATUS    //结构体         {                public Byte ACLineStatus;                //0 = offline, 1 = Online, 255 = UnKnown Status.                public Byte BatteryFlag;               public Byte BatteryLifePercent;               public Byte Reserved1;               public int BatteryLifeTime;                public int BatteryFullLifeTime;            }          /// <summary>        ///  获取系统电量百分比        /// </summary>        /// <returns></returns>        public static float GetSystemPower()        {            SYSTEM_POWER_STATUS SysPower = new SYSTEM_POWER_STATUS();            GetSystemPowerStatus(ref SysPower);            return SysPower.BatteryLifePercent;        }