c# - Windows 窗体 - 高 CPU 使用率

Question

这里是新手，我的表单正在监视 Caps Lock 状态，但使用了大约 50% 的 CPU，我认为这与 Application.Idle += Application_Idle 和 Application.Idle -= Application_Idle 有关。一旦我删除了那些，我的表单就不会监视 Caps Lock 状态，有什么建议吗？

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace CapsLockChecker
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            Application.Idle += Application_Idle;
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        void Application_Idle(object sender, EventArgs e)
        {
            if (Control.IsKeyLocked(Keys.CapsLock))
            {
                label1.Text = "CapsLock is On";
                pictureBox1.ImageLocation = "C:\\Users\\user\\source\\repos\\CapsLockChecker\\CapsLockChecker\\if_Circle_Green_34211.png";
            }
            else
            {
                label1.Text = "CapsLock if Off";
                pictureBox1.ImageLocation = "C:\\Users\\user\\source\\repos\\CapsLockChecker\\CapsLockChecker\\if_Circle_Red_34214.png";
            }
        }

        protected override void OnFormClosed(FormClosedEventArgs e)
        {
            Application.Idle -= Application_Idle;
            base.OnFormClosed(e);
        }
    }
}

Answer 1

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        this.KeyDown += CapsLockMonitor;
        this.KeyPreview = true;
    }

    private void CapsLockMonitor(object sender, KeyEventArgs e)
    {
        if (Control.IsKeyLocked(Keys.CapsLock))
        {
            this.label1.Text = "Caps lock enabled!";
        }
        else
        {
            this.label1.Text = "Caps lock disabled!";
        }
    }
}

这似乎并没有耗尽我所有的 CPU，我用我的自定义委托(delegate)订阅了 KeyDown 事件。