在.NET中交换鼠标左键和右键

using System;
using System.Windows.Forms;

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

        protected override void WndProc(ref Message m)
        {
            const int WM_LBUTTONDOWN = 0x201;
            const int WM_LBUTTONUP = 0x202;
            const int WM_RBUTTONDOWN = 0x204;
            const int WM_RBUTTONUP = 0x205;

            if (m.Msg == WM_LBUTTONDOWN || m.Msg == WM_LBUTTONUP ||
                m.Msg == WM_RBUTTONDOWN || m.Msg == WM_RBUTTONUP)
            {
                // 交换左键和右键的消息
                if (m.Msg == WM_LBUTTONDOWN)
                    m.Msg = WM_RBUTTONDOWN;
                else if (m.Msg == WM_LBUTTONUP)
                    m.Msg = WM_RBUTTONUP;
                else if (m.Msg == WM_RBUTTONDOWN)
                    m.Msg = WM_LBUTTONDOWN;
                else if (m.Msg == WM_RBUTTONUP)
                    m.Msg = WM_LBUTTONUP;
            }

            base.WndProc(ref m);
        }
    }
}