public partial class RichTextBox : System.Windows.Forms.RichTextBox

    {

        public RichTextBox()

        {

            InitializeComponent();

        }



        protected override void OnMouseWheel(MouseEventArgs e)

        {

            if (!IsKeyCtrlDown)

                base.OnMouseWheel(e);//这句屏蔽不掉RichTextBox的Ctrl+鼠标Wheel缩放功能

        }



        static object objForLock = new object();



        [System.Runtime.InteropServices.DllImport("user32.dll", EntryPoint = "GetKeyboardState")]

        public static extern int GetKeyboardState(byte[] pbKeyState);



        bool IsKeyCtrlDown

        {

            get

            {

                bool blT = false;

                byte[] byteBuffer = new byte[256];

                if (GetKeyboardState(byteBuffer) > 0)

                    blT = byteBuffer[17] >= 128;

                return blT;

            }

        }