如何在c#中获得组合键

using System;
using System.Windows.Forms;

namespace CombinationKeyExample
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.Control && e.KeyCode == Keys.A)
            {
                MessageBox.Show("Ctrl + A 被按下");
            }
            else if (e.Control && e.KeyCode == Keys.B)
            {
                MessageBox.Show("Ctrl + B 被按下");
            }
            else if (e.Control && e.KeyCode == Keys.C)
            {
                MessageBox.Show("Ctrl + C 被按下");
            }
        }
    }
}