int _kbhit( void );
Return Value
_kbhit returns a nonzero value if a key has been pressed. Otherwise， it returns 0.
Remarks
The _kbhit function checks the console for a recent keystroke. If the functionreturns a nonzero value， a keystroke is waiting in the buffer. The program can then call _getch or _getche to get the keystroke.
下面这个程序中就用到了这种方法，用于判断在3秒中内是否有键按下。
using System;
using System.Runtime.InteropServices;
using System.Threading;
namespace ConsoleApplication2
{
class Program
{
[DllImport("msvcrt.dll")]
public static extern int _getch();
[DllImport("msvcrt.dll")]
public static extern int _kbhit();
static void Main(string args)
{
Console.WriteLine("Press Any Key to Continue");
int counter = 0;
while ((_kbhit() 0) counter < 30)
{
Thread.Sleep(100);
counter++;
}
if (counter < 30)
{
Console.WriteLine("you pressed " + (char)_getch());
}
else
{
Console.WriteLine("You did not press anything using default after 3seconds");
}
}
}
}程序不停的输出“循环中”，按a退出
using System;
namespace ConsoleApplication2
{
class Program
{
static void Main(string args)
{
bool a = false;
ConsoleKeyInfo keyInfo;
while (!a)
{
if (System.Console.KeyAvailable)//如果有键按下
{
keyInfo = System.Console.ReadKey(true);//读取
if (keyInfo.KeyChar 0x1b)//判断
a = true;
}
else
System.Console.WriteLine("循环中");
}
}
}
}