C#屏蔽常规热键

如果你想在C#应用程序中屏蔽常规热键（例如Ctrl+C、Alt+Tab等），可以使用Windows API函数来实现。以下是一个示例代码，演示了如何屏蔽Ctrl+Alt+Delete热键：

using System;
using System.Runtime.InteropServices;
using System.Windows.Forms;

public class HotkeyInterceptor
{
    private const int WH_KEYBOARD_LL = 13;
    private const int HC_ACTION = 0;
    private const int VK_CONTROL = 0x11;
    private const int VK_MENU = 0x12;
    private const int VK_DELETE = 0x2E;
    private static LowLevelKeyboardProc _proc = HookCallback;
    private static IntPtr _hookID = IntPtr.Zero;

    public static void Main()
    {
        _hookID = SetHook(_proc);
        Application.Run();
        UnhookWindowsHookEx(_hookID);
    }

    private delegate IntPtr LowLevelKeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);

    private static IntPtr SetHook(LowLevelKeyboardProc proc)
    {
        using (Process curProcess = Process.GetCurrentProcess())
        using (ProcessModule curModule = curProcess.MainModule)
        {
            return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
        }
    }

    private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
    {
        if (nCode >= 0 && wParam == (IntPtr)HC_ACTION)
        {
            int vkCode = Marshal.ReadInt32(lParam);
            if ((Control.ModifierKeys & Keys.Control) != 0 && (Control.ModifierKeys & Keys.Alt) != 0 && vkCode == VK_DELETE)
            {
                return (IntPtr)1; //屏蔽Ctrl+Alt+Delete
            }
        }
        return CallNextHookEx(_hookID, nCode, wParam, lParam);
    }

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr SetWindowsHookEx(int idHook, LowLevelKeyboardProc lpfn, IntPtr hMod, uint dwThreadId);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool UnhookWindowsHookEx(IntPtr hhk);

    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);

    [DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
    private static extern IntPtr GetModuleHandle(string lpModuleName);
}

这段代码使用了`SetWindowsHookEx`函数来设置一个键盘钩子，然后在`HookCallback`方法中检查按下的键是否是Ctrl+Alt+Delete，并通过返回值来屏蔽该热键。注意，这个代码只是演示了如何屏蔽一个热键，你需要根据自己的需求进行修改。