using System;
using System.Collections.Generic;
using System.ComponentModel;
class IteratorWorkflow
{
static readonly string Padding = new string(' ', 30);
static IEnumerable<int> GetEnumerable(){
Console.WriteLine(Padding);
for (int i = 0; i < 3; i++){
Console.WriteLine("{0}About to yield {1}", Padding, i);
yield return i;
Console.WriteLine("{0}After yield", Padding);
}
Console.WriteLine(Padding);
yield return -1;
}
static void Main(){
IEnumerable<int> iterable = GetEnumerable();
IEnumerator<int> iterator = iterable.GetEnumerator();
while (true){
bool result = iterator.MoveNext();
Console.WriteLine(result);
if (!result)
{
break;
}
Console.WriteLine(iterator.Current);
}
}
}
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