//引入命名空间
using System;
using System.Text;

public class ConsoleKeyExample
{
   public static void Main()
   {
      ConsoleKeyInfo input;
      do {
         Console.WriteLine("Press a key, together with Alt, Ctrl, or Shift.");
         Console.WriteLine("Press Esc to exit.");
         input = Console.ReadKey(true);

         StringBuilder output = new StringBuilder(
                       String.Format("You pressed {0}", input.Key.ToString()));
         bool modifiers = false;
         
         if ((input.Modifiers & ConsoleModifiers.Alt) == ConsoleModifiers.Alt) {
            output.Append(", together with " + ConsoleModifiers.Alt.ToString());
            modifiers = true;
         }
         if ((input.Modifiers & ConsoleModifiers.Control) == ConsoleModifiers.Control)
         {
            if (modifiers) {
               output.Append(" and ");
            }   
            else {
               output.Append(", together with ");
               modifiers = true;
            }
            output.Append(ConsoleModifiers.Control.ToString());
         }
         if ((input.Modifiers & ConsoleModifiers.Shift) == ConsoleModifiers.Shift)
         {
            if (modifiers) {
               output.Append(" and ");
            }   
            else {
               output.Append(", together with ");
               modifiers = true;
            }
            output.Append(ConsoleModifiers.Shift.ToString());
         }
         output.Append(".");                  
         Console.WriteLine(output.ToString());
         Console.WriteLine();
      } while (input.Key != ConsoleKey.Escape);
   }
}
// The output from a sample console session might appear as follows:
//       Press a key, along with Alt, Ctrl, or Shift.
//       Press Esc to exit.
//       You pressed D.
//       
//       Press a key, along with Alt, Ctrl, or Shift.
//       Press Esc to exit.
//       You pressed X, along with Shift.
//       
//       Press a key, along with Alt, Ctrl, or Shift.
//       Press Esc to exit.
//       You pressed L, along with Control and Shift.
//       
//       Press a key, along with Alt, Ctrl, or Shift.
//       Press Esc to exit.
//       You pressed P, along with Alt and Control and Shift.
//       
//       Press a key, along with Alt, Ctrl, or Shift.
//       Press Esc to exit.
//       You pressed Escape.