MethodEvery7SecondsOnly.cs

using System;

namespace ConsoleApplication2
{
  class Program
  {
    private static DateTime _lastInvoke = DateTime.MinValue;

    public static void Main()
    {
      ConsoleKey input;
      while ( (input = Console.ReadKey().Key) != ConsoleKey.Escape  )
        Update( input );
    }
    

    private static void Update( ConsoleKey key )
    {
      if( key == ConsoleKey.Spacebar && DateTime.Now - _lastInvoke > TimeSpan.FromSeconds( 7 ) )
      {
        MethodA();
        _lastInvoke = DateTime.Now;
      }
    }

    public static void MethodA()
    {
      Console.WriteLine( "Invoked Method A" );
    }
  }
}