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interface ILinkableComponent
{
    IList<IExchangeItem> InputItems { get; }
    IList<IExchangeItem> OutputItems { get; }

    void Update();
}

interface ITimeRunnableComponent : ILinkableComponent
{
   void Run(DateTime startTime, DateTime endTime);

   DateTime TimeHorizonStart { get; } // component will provide possible min start and max end times
   DateTime TimeHorizonEnd { get; }

   DateTime CurrentTime { get; } // will change after each run
}

class TimeRunnableComponentTests
{
  void RunTimeRunnableComponent()
  {
     ITimeRunnableComponent c1 = ...;

     DateTime t0 = c1.TimeHorizonStart;

     TimeSpan duration = new TimeSpan(0, 0, 10); // hours, minutes, seconds
     DateTime t1 = t0.Add(duration);

     c1.Run(t0, t1);

    // check current component time
     DateTime currentComponentTime = c1.CurrentTime;
     Assert.AreEqual(t1, currentComponentTime);
  }

  void RunTimeRunnableComponentInGenericWay() 
  {
    // StartTime, EndTime may be wrapped by input exchange items 
    // which may be even linked to another component, e.g. controls in ComponentRunDialog.

    ILinkableComponent c1 = ...;

    // assume that 1st and 2nd output exchange items of component equal to time horizon start and end.
    DateTime t0 = (DateTime)c1.OutputItems[0].Value;

    TimeSpan duration = new TimeSpan(0, 0, 10); // hours, minutes, seconds
    DateTime t1 = t0.Add(duration);

    // assuming that 1st and 2nd input exchange items of component used as run star and run end times
    c1.InputItems[0].Value = t0;
    c1.InputItems[1].Value = t1;

    c1.Update();

    // assume that 3rt output exchange item of component is "current time"
    Assert.AreEqual(c1.OutputItems[2].Name, "current time");

    // check current component time
    DateTime currentComponentTime = (DateTime)c1.OutputItems[2].Value;
    Assert.AreEqual(t1, currentTime);
  }
}

{