/// <summary>
/// Returns the load in an intensive unit for a given point in time.
/// </summary>
/// <param name="em">Energiemenge</param>
/// <param name="me">an intensive unit (e.g. "kW")</param>
/// <param name="dt">point in time</param>
/// <returns>load if Energiemenge BO contains value for specified date time<paramref name="dt"/>, null otherwise</returns>
public static decimal?GetLoad(this BO4E.BO.Energiemenge em, Mengeneinheit me, DateTime dt)
{
if (!me.IsIntensive())
{
throw new ArgumentException($"The Mengeneinheit {me} isn't intensive. Calculating the value for a specific point in time doesn't make sense.");
}
decimal?result = null;
foreach (Verbrauch v in em.Energieverbrauch.Where(v => v.Startdatum <= dt && dt < v.Enddatum))
{
if (result.HasValue)
{
result += v.Wert;
}
else
{
result = v.Wert;
}
}
return(result);
}
