窗体构造函数中加上
            TestMessageFilter filter = new TestMessageFilter();
            Application.AddMessageFilter(filter);
//筛选器类
    [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
    public class TestMessageFilter : IMessageFilter
    {
        public bool PreFilterMessage(ref Message m)
        {
            // Blocks all the messages relating to the left mouse button.
            if (m.Msg >= 513 && m.Msg <= 515)
            {
                Console.WriteLine("Processing the messages : " + m.Msg);
                return true;
            }
            return false;
        }
    }