private static IEnumerable<ITask> GetDependantTasks(IEnumerable<ITask> tasks, ITask task)
{
var dependsUpon = task.DependsUpon();
if (dependsUpon == null) {
return new List<ITask>();
}
var dependsUponList = dependsUpon as List<Type> ?? dependsUpon.ToList();
return tasks.Where(t => dependsUponList.Contains(t.GetType()));
}