C# 按键不捕获“删除”键

如何在 C# 中不捕获删除键？

csharp
using System;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Windows.Forms;
class Program
{
    // 定义键盘钩子的委托类型
    private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
    // 导入 Windows API 函数来设置键盘钩子
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
    // 导入 Windows API 函数来卸载键盘钩子
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern bool UnhookWindowsHookEx(IntPtr hhk);
    // 导入 Windows API 函数来调用下一个钩子
    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
    // 导入 Windows API 函数来获取当前线程的标识符
    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern int GetCurrentThreadId();
    // 常量定义
    private const int WH_KEYBOARD_LL = 13;
    private const int WM_KEYDOWN = 0x0100;
    private const int VK_DELETE = 0x2E;
    // 键盘钩子的处理函数
    private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
        {
            int vkCode = Marshal.ReadInt32(lParam);
            if (vkCode == VK_DELETE)
            {
                // 返回 1 表示不处理该按键
                return (IntPtr)1;
            }
        }
        return CallNextHookEx(IntPtr.Zero, nCode, wParam, lParam);
    }
    static void Main(string[] args)
    {
        // 设置键盘钩子
        IntPtr hook = SetWindowsHookEx(WH_KEYBOARD_LL, HookCallback, IntPtr.Zero, (uint)GetCurrentThreadId());
        // 启动一个消息循环，以便窗口可以接收键盘事件
        Application.Run();
        // 卸载键盘钩子
        UnhookWindowsHookEx(hook);
    }
}