问如何为WinForms RichTextBox重写WinForms(0)？

EN

    [DllImport("user32")]
    private static extern IntPtr SetWindowsHookEx(int hookType, KeyboardLowLevelProc proc, IntPtr moduleHandle, int threadID);
    [DllImport("user32")]
    private static extern int UnhookWindowsHookEx(IntPtr hHook);
    [DllImport("user32")]
    private static extern IntPtr CallNextHookEx(IntPtr hHook, int nCode, IntPtr wParam, IntPtr lParam);
    [DllImport("kernel32")]
    private static extern IntPtr GetModuleHandle(string moduleName);

    public struct KBDLLHOOKSTRUCT
    {
        public Keys key;
        public int scanCode;
        public int flags;
        public int time;
        public IntPtr extra;
    }
    public delegate IntPtr KeyboardLowLevelProc(int hCode, IntPtr wParam, IntPtr lParam);
    public IntPtr KeyboardLowLevelCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0) {
            KBDLLHOOKSTRUCT kbd = (KBDLLHOOKSTRUCT)Marshal.PtrToStructure(lParam, typeof(KBDLLHOOKSTRUCT));
            if (kbd.key == Keys.D0 && blockD0) {                
                if(ModifierKeys == (Keys.Control | Keys.Shift)) {
                    SendKeys.Send("{ESC}");
                    //Add custom code as the response to Ctrl + Shift + D0 here
                    //....
                }
                return new IntPtr(1);//Discard the default behavior
            }
        }
        return CallNextHookEx(hHook, nCode, wParam, lParam);
    }
    bool blockD0;
    KeyboardLowLevelProc proc; //this should be declared in the form scope
    IntPtr hHook;
    //your Form1 constructor
    public Form1(){
       InitializeComponent();
       //Get current module Handle
       IntPtr currentModuleHandle = GetModuleHandle(System.Diagnostics.Process.GetCurrentProcess().MainModule.ModuleName);
       //Set the keyboard hook
       hHook = SetWindowsHookEx(13, proc, currentModuleHandle, 0);//WH_KEYBOARD_LL = 13
       //register these Key events for your richTextBox1 
       richTextBox1.KeyDown += (s, e) => {
            if(e.KeyCode != Keys.D0) blockD0 = true;
       };
       richTextBox1.KeyUp += (s, e) => {
            if (ModifierKeys == Keys.None) blockD0 = false;
       };
       //Unhook keyboard when form is closed
       FormClosed += (s,e) => {
          if (hHook != IntPtr.Zero) {
              UnhookWindowsHookEx(hHook);
              hHook = IntPtr.Zero;
          }
       }
    }

//Create a custom RichTextBox class
public class CustomRichTextBox : RichTextBox {
   protected override void WndProc(ref Message m){
     if(m.Msg == 0x50) return; //WM_INPUTLANGCHANGEREQUEST = 0x50
     base.WndProc(ref m);
   }
   public override bool PreProcessMessage(ref Message msg) {            
        if (msg.Msg == 0x100)//WM_KEYDOWN = 0x100
        {
           Keys keyData = (Keys)msg.WParam | ModifierKeys;
           if(keyData == (Keys.Control | Keys.Shift | Keys.D0)){
             //your own code goes here...
           }
        }
        return base.PreProcessMessage(ref msg);
   }
}