电源管理概述

Windows 电源管理是现代应用程序中非常重要的功能，它可以帮助开发者控制系统电源状态，优化应用程序的能耗和性能。在 C# 中，我们可以通过 Microsoft.Win32 命名空间和 System.Windows.Forms 中的相关类来实现电源管理功能。

电源状态管理

电源状态监控

C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AppPower
{
    public class PowerStatusMonitor
    {
        /// <summary>
        /// 获取当前电池状态
        /// </summary>
        public (float,string,int) MonitorBatteryStatus()
        {
            PowerStatus powerStatus = SystemInformation.PowerStatus;

            // 电池电量百分比
            float batteryPercentage = powerStatus.BatteryLifePercent * 100;

            // 电池充电状态
            string chargeStatus = powerStatus.BatteryChargeStatus.ToString();

            // 剩余电池时间
            int remainingMinutes = powerStatus.BatteryLifeRemaining;

            return (batteryPercentage, chargeStatus, remainingMinutes);
        }
    }
}

电源模式切换

C#
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace AppPowerControl
{
    public enum PowerMode
    {
        Unknown,
        Balanced,
        HighPerformance,
        PowerSaver
    }

    public class PowerModeManager
    {
        // Windows API 导入  
        [DllImport("powrprof.dll")]
        public static extern bool SetSuspendState(bool hibernate, bool forceCritical, bool disableWakeEvent);

        [DllImport("PowrProf.dll")]
        public static extern uint PowerGetActiveScheme(IntPtr UserRootPowerKey, out IntPtr ActivePolicyGuid);

        [DllImport("PowrProf.dll")]
        public static extern uint PowerSetActiveScheme(IntPtr UserRootPowerKey, ref Guid SchemeGuid);

        // 预定义的电源方案GUID  
        private static readonly Guid GUID_BALANCED_POWER_PLAN = new Guid("381b4222-f694-41f0-9685-ff5bb260df2e");
        private static readonly Guid GUID_HIGH_PERFORMANCE_POWER_PLAN = new Guid("8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c");
        private static readonly Guid GUID_POWER_SAVER_POWER_PLAN = new Guid("a1841308-3541-4fab-bc81-f71556f20b4a");

        public static void SwitchPowerMode(PowerMode mode)
        {
            try
            {
                Guid targetScheme;
                switch (mode)
                {
                    case PowerMode.Balanced:
                        targetScheme = GUID_BALANCED_POWER_PLAN;
                        break;
                    case PowerMode.HighPerformance:
                        targetScheme = GUID_HIGH_PERFORMANCE_POWER_PLAN;
                        break;
                    case PowerMode.PowerSaver:
                        targetScheme = GUID_POWER_SAVER_POWER_PLAN;
                        break;
                    default:
                        throw new ArgumentException("Invalid power mode");
                }

                uint result = PowerSetActiveScheme(IntPtr.Zero, ref targetScheme);
                if (result == 0)
                {
                    Console.WriteLine($"Successfully switched to {mode} mode");
                }
                else
                {
                    Console.WriteLine($"Failed to switch power mode. Error code: {result}");
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error switching power mode: {ex.Message}");
            }
        }

        public static PowerMode GetCurrentPowerMode()
        {
            IntPtr activeScheme;
            PowerGetActiveScheme(IntPtr.Zero, out activeScheme);
            if (activeScheme != IntPtr.Zero)
            {
                Guid currentScheme = (Guid)Marshal.PtrToStructure(activeScheme, typeof(Guid));

                if (currentScheme.Equals(GUID_BALANCED_POWER_PLAN))
                    return PowerMode.Balanced;
                if (currentScheme.Equals(GUID_HIGH_PERFORMANCE_POWER_PLAN))
                    return PowerMode.HighPerformance;
                if (currentScheme.Equals(GUID_POWER_SAVER_POWER_PLAN))
                    return PowerMode.PowerSaver;
            }

            return PowerMode.Unknown;
        }
    }
}

C#
namespace AppPowerControl
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // 获取当前电源模式  
            PowerMode currentMode = PowerModeManager.GetCurrentPowerMode();
            Console.WriteLine($"Current power mode: {currentMode}");

            // 切换到高性能模式  
            PowerModeManager.SwitchPowerMode(PowerMode.HighPerformance);

            // 切换到节能模式  
            PowerModeManager.SwitchPowerMode(PowerMode.PowerSaver);

            // 切换到平衡模式  
            PowerModeManager.SwitchPowerMode(PowerMode.Balanced);

            Console.ReadLine();
        }
    }
}

注意事项

• 某些电源管理操作需要管理员权限
• 不同的 Windows 版本可能有细微差异
• 建议在实际应用中添加更多错误处理和用户交互

结论

通过合理使用 C# 的电源管理 API，开发者可以为 Windows 应用程序提供更智能、更节能的用户体验。

参考资料

• Microsoft Windows API 文档
• .NET Framework 系统电源管理类