Treat Code as Data: C#: Defer Execution: Listing 1

The first line of this sample doesn't actually do anything. It builds the structure that creates the sequence one item at a time, as you need it.

public static class MyExtensions
{
   public static IEnumerable<T> 
      Generate<T>(int num, 
      Func<T> Generator)
   {
      int index = 0;
      while (index++ < num)
      {
         yield return Generator();
      }
   }
}

IEnumerable<DateTime> sequence = 
   MyExtensions.Generate(5, 
   () => DateTime.Now);
foreach (var time in sequence)
{
   Console.WriteLine(time);
   System.Threading.Thread.Sleep(9000);
}

System.Threading.Thread.Sleep(9000);

Console.WriteLine("Do it again");

foreach (var time in sequence)
{
   Console.WriteLine(time);
   System.Threading.Thread.Sleep(9000);
}
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