Question

C#如何禁止按 ALT+TABLE

Answer 1

最简单方法是使用RegisterHotKey函数。在调用该函数后你的进程会在ALT-TAB按下时比系统先得到通知。然后在你的程序中处理WM_HOTKEY消息.
public class Win32Hook
{

[DllImport("kernel32")]
public static extern int GetCurrentThreadId();

[DllImport( "user32",
CharSet=CharSet.Auto,CallingConvention=CallingConvention.StdCall)]
public static extern int SetWindowsHookEx(
HookType idHook,
HOOKPROC lpfn,
int hmod,
int dwThreadId);

public enum HookType
{
WH_KEYBOARD = 2
}

public delegate int HOOKPROC(int nCode, int wParam, int lParam);

public void SetHook()
{
// set the keyboard hook
SetWindowsHookEx(HookType.WH_KEYBOARD,
new HOOKPROC(this.MyKeyboardProc),
0,
GetCurrentThreadId());
}

public int MyKeyboardProc(int nCode, int wParam, int lParam)
{
//Perform your process
return 0;
}
}

And then you can install the hook procedure by the following code:

Win32Hook hook = new Win32Hook();
hook.SetHook();

Answer 2

这种底层东西建议你用Delphi或VC写，然后生成个DLL，由C#调用，要不用C#调API太烦了。