internal void RemoveFromDemoChildren(DemoChild demoChild)
{
#if DEBUG
if (!demoChildren.Remove(demoChild))
{
throw new Exception();
}
#else
demoChildren.Remove(demoChild);
#endif
onRemovedFromDemoChildren(demoChild);
#if DEBUG
DC.Trace?.Invoke($"Remove DemoChild {demoChild.GetKeyOrHash()} from " +
$"{this.GetKeyOrHash()} DemoParent.DemoChildren");
#endif
}
internal void AddToDemoChildren(DemoChild demoChild)
{
#if DEBUG
if (demoChild == DemoChild.NoDemoChild)
{
throw new Exception();
}
if ((demoChild.Key >= 0) && (Key < 0))
{
throw new Exception();
}
if (demoChildren.Contains(demoChild))
{
throw new Exception();
}
#endif
demoChildren.Add(demoChild);
onAddedToDemoChildren(demoChild);
#if DEBUG
DC.Trace?.Invoke($"Add DemoChild {demoChild.GetKeyOrHash()} to " +
$"{this.GetKeyOrHash()} DemoParent.DemoChildren");
#endif
}