原文链接：

using System;

using System.ComponentModel;

using System.Drawing;

using System.Windows.Forms;

using System.Runtime.InteropServices;

namespace WindowsApplication1 {

  public partial class Form1 : Form, IMessageFilter {

    public Form1() {

      InitializeComponent();

      Application.AddMessageFilter(this);

    }

    public bool PreFilterMessage(ref Message m) {

      if (m.Msg == 0x20a) {

        // WM_MOUSEWHEEL, find the control at screen position m.LParam

        Point pos = new Point(m.LParam.ToInt32() & 0xffff, m.LParam.ToInt32() >> 16);

        IntPtr hWnd = WindowFromPoint(pos);

        if (hWnd != IntPtr.Zero && hWnd != m.HWnd && Control.FromHandle(hWnd) != null) {

          SendMessage(hWnd, m.Msg, m.WParam, m.LParam);

          return true;

        }

      }

      return false;

    }

    // P/Invoke declarations

    [DllImport("user32.dll")]

    private static extern IntPtr WindowFromPoint(Point pt);

    [DllImport("user32.dll")]

    private static extern IntPtr SendMessage(IntPtr hWnd, int msg, IntPtr wp, IntPtr lp);

  }

}